• warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.
  • warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/opticist/public_html/modules/aggregator/aggregator.pages.inc on line 259.

Feed aggregator

Reduction of the diffraction in strongly resonant thin-film Fabry–Perot filters between single-mode fibers

Applied Optics - Wed, 05/22/2013 - 01:00
Jean Bittebierre
Simulations show that the cumbersome diffraction losses occurring in narrow bandpass thin-film Fabry–Perot filters (TF-FP filters) inserted between two narrow-core optical fibers are strongly reduced by introducing into the filter a pair of film materials with high refraction index contrast. ... [Appl. Opt. 52, 3645-3654 (2013)]
Categories: Optics news

Refractive index measurement by fiber point diffraction longitudinal shearing interferometry

Applied Optics - Wed, 05/22/2013 - 01:00
Lingfeng Chen, Xiaofei Guo, Jinjian Hao
A refractive index measurement method by measuring the longitudinal displacement of a point light source (PLS) after passing through a plane-parallel-plate sample is proposed. The displacement is derived by applying two point-diffraction longitudinal shearing interferometric measurements if the ... [Appl. Opt. 52, 3655-3661 (2013)]
Categories: Optics news

Coherence scanning interferometry: linear theory of surface measurement

Applied Optics - Wed, 05/22/2013 - 01:00
Jeremy Coupland, Rahul Mandal, Kanik Palodhi, Richard Leach
The characterization of imaging methods as three-dimensional (3D) linear filtering operations provides a useful way to compare the 3D performance of optical surface topography measuring instruments, such as coherence scanning interferometry, confocal and structured light microscopy. In this way, ... [Appl. Opt. 52, 3662-3670 (2013)]
Categories: Optics news

Design and performance of an absolute gas refractometer based on a synthetic pseudo-wavelength method

Applied Optics - Wed, 05/22/2013 - 01:00
Jitao Zhang, Pei Huang, Yan Li, Haoyun Wei
We present a refractometer that is capable of measuring the refractive index of gases with an unambiguous range of 1.000395 and an uncertainty of 3.14×10^−8 at 633 nm. The measurement range was extended via the combination of the vacuum cells according to the proposed synthetic ... [Appl. Opt. 52, 3671-3679 (2013)]
Categories: Optics news

Hybrid optical system for three-dimensional shape acquisition

Applied Optics - Wed, 05/22/2013 - 01:00
In Yeop Jang, Min Ki Park, Kwan H. Lee
Hybrid concepts are often used to improve existing methods in many fields. We developed a hybrid optical system that consists of multiple color cameras and one depth camera to make up the concavity problem of the visual hull construction. The heterogeneous data from the color cameras and the depth ... [Appl. Opt. 52, 3680-3688 (2013)]
Categories: Optics news

Design analysis of a fiber-bundle-based mobile free-space optical link with wavelength diversity

Applied Optics - Wed, 05/22/2013 - 01:00
Dayong Zhou, Peter G. LoPresti, Hazem H. Refai
This paper reports on a simulation-based investigation of a wavelength diverse free-space optical link with an emphasis on identifying design choices that optimize the performance of the system under different operating scenarios. The simulation incorporates experimental data into the theoretical ... [Appl. Opt. 52, 3689-3697 (2013)]
Categories: Optics news

Electrically pumped simultaneous ultraviolet and visible random laser actions from ZnO-CdO interdiffused film

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Ye Tian, Xiangyang Ma, Luelue Xiang, and Deren Yang
We have demonstrated electrically pumped simultaneous ultraviolet (UV) and visible random laser (RL) actions from ZnO-CdO interdiffused film. The interdiffusion between ZnO and CdO films at 700 degrees C forms composition-graded CdZnO alloy within the ZnO-CdO interdiffused film, which is luminescen ... [Appl. Phys. Lett. 99, 261111 (2011)] published Fri Dec 30, 2011.
Categories: Optics news

Whispering gallery modes with different polarizations in semiconductor microrod with rectangle shape

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Xiaoliang Ye, Huibing Mao, Jiqing Wang, and Ziqiang Zhu
The whispering gallery modes (WGMs) of the ZnO photoluminescence emission were investigated in this paper. The transmission electron microscopy and X-ray diffraction results confirm that the rectangle microrod has a single crystalline wurtzite structure. Except for the band-edge emission, the visibl ... [Appl. Phys. Lett. 99, 261112 (2011)] published Fri Dec 30, 2011.
Categories: Optics news

Lasing in planar semiconductor diodes

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Giorgio De Simoni, Lukas Mahler, Vincenzo Piazza, Alessandro Tredicucci, Christine A. Nicoll et al.
We present a planar laser diode based on a simple fabrication scheme compatible with virtually any geometry accessible by standard semiconductor lithography technique. We show that our lasers exhibit ~1 GHz -3 dB-modulation-bandwidth already in this prototypical implementation. Directions for a sign ... [Appl. Phys. Lett. 99, 261110 (2011)] published Fri Dec 30, 2011.
Categories: Optics news

Performance of large-area few-layer graphene saturable absorber in femtosecond bulk laser

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Jin-Long Xu, Xian-Lei Li, Jing-Liang He, Xiao-Peng Hao, Yong-Zhong Wu et al.
Using large-area graphene sheets of 1-10 layers prepared by the improved liquid phase exfoliation technique, the mode locking operation of a diode-pumped Yb:KGW laser was demonstrated. Near-transform-limited 428 fs pulses were yielded at 1031.1 nm with an output power of 504 mW, corresponding to the ... [Appl. Phys. Lett. 99, 261107 (2011)] published Thu Dec 29, 2011.
Categories: Optics news

On-chip single photon emission from an integrated semiconductor quantum dot into a photonic crystal waveguide

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Andre Schwagmann, Sokratis Kalliakos, Ian Farrer, Jonathan P. Griffiths, Geb A. C. Jones et al.
We demonstrate the in-plane emission of highly polarized single photons from an InAs quantum dot embedded into a photonic crystal waveguide. The spontaneous emission rates are Purcell-enhanced by the coupling of the quantum dot to a slow-light mode of the waveguide. Photon-correlation measurements c ... [Appl. Phys. Lett. 99, 261108 (2011)] published Thu Dec 29, 2011.
Categories: Optics news

Low-loss flake-graphene saturable absorber mirror for laser mode-locking at sub-200-fs pulse duration

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
B. V. Cunning, C. L. Brown, and D. Kielpinski
Saturable absorbers are a key component for mode-locking femtosecond lasers. Polymer films containing graphene flakes have recently been used in transmission as laser mode-lockers but suffer from high nonsaturable loss, limiting their application in low-gain lasers. Here, we present a saturable abso ... [Appl. Phys. Lett. 99, 261109 (2011)] published Thu Dec 29, 2011.
Categories: Optics news

Effect of temperature and strain on the optical polarization of (In)(Al)GaN ultraviolet light emitting diodes

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Tim Kolbe, Arne Knauer, Chris Chua, Zhihong Yang, Viola Kueller et al.
The temperature and strain dependence of the polarization of the in-plane electroluminescence of (0001) orientated (In)(Al)GaN multiple quantum well light emitting diodes in the ultraviolet spectral range has been investigated. For light emitting diodes with emission wavelength shorter than 300 nm t ... [Appl. Phys. Lett. 99, 261105 (2011)] published Wed Dec 28, 2011.
Categories: Optics news

Microfabricated continuous cubic phase plate induced Airy beams for optical manipulation with high power efficiency

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Rui Cao, Yong Yang, Jingang Wang, Jing Bu, Mingwei Wang et al.
We studied and demonstrated optical trapping capabilities of an Airy beam generated with a cubic phase plate incorporated into a conventional optical tweezer system. The power efficiency and damage threshold of the cubic phase plate were found to be much higher when spatial light modulators were emp ... [Appl. Phys. Lett. 99, 261106 (2011)] published Wed Dec 28, 2011.
Categories: Optics news

High power, continuous wave, quantum cascade ring laser

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Y. Bai, S. Tsao, N. Bandyopadhyay, S. Slivken, Q. Y. Lu et al.
We demonstrate a quantum cascade ring laser with high power room temperature continuous wave operation. A second order distributed feedback grating buried inside the waveguide provides both in-plane feedback and vertical power outcoupling. Total output power reaches 0.51 W at an emission wavelength ... [Appl. Phys. Lett. 99, 261104 (2011)] published Wed Dec 28, 2011.
Categories: Optics news

Realization of tightly confined channel plasmon polaritons at low frequencies

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Tao Jiang, Linfang Shen, Jin-Jei Wu, Tzong-Jer Yang, Zhichao Ruan et al.
Subwavelength guiding of channel plasmon polaritons (CPPs) is realized by a properly structured metallic groove at frequencies far below the plasma frequency of metal. Compared with CPPs at visible frequencies, more versatile physical mechanisms can be introduced in these CPPs by surface patterning, ... [Appl. Phys. Lett. 99, 261103 (2011)] published Tue Dec 27, 2011.
Categories: Optics news

Wavelength tunable ultraviolet laser emission via intra-cavity frequency doubling of an AlGaInP vertical external-cavity surface-emitting laser down to 328 nm

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
T. Schwarzback, H. Kahle, M. Eichfelder, R. Rossbach, M. Jetter et al.
We demonstrate an optically pumped vertical external-cavity surface-emitting laser in a compact v-shaped cavity configuration for frequency doubling to the ultraviolet (UV) spectral range at ~330 nm. The fundamental red laser emission is realized with a metal-organic vapor-phase epitaxy grown (GaIn) ... [Appl. Phys. Lett. 99, 261101 (2011)] published Tue Dec 27, 2011.
Categories: Optics news

Effect of asymmetric Schottky barrier on GaN-based metal-semiconductor-metal ultraviolet detector

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Dabing Li, Xiaojuan Sun, Hang Song, Zhiming Li, Hong Jiang et al.
An asymmetric Schottky barrier metal-semiconductor-metal (MSM) ultraviolet (UV) detector with Ni/GaN/Au structure was designed and the effect of the asymmetric Schottky barrier on the detector response was investigated. This detector had response at 0 V bias and increased responsivity when a positiv ... [Appl. Phys. Lett. 99, 261102 (2011)] published Tue Dec 27, 2011.
Categories: Optics news

Detecting surface acoustic wave gyroscopic signal by acousto-optic coupling

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
Shuxiang Lu, Shufen Chen, Honglang Li, Lei Fu, Zhengfeng Zou et al.
A technique for surface acoustic wave (SAW) gyroscopic signal detection by acousto-optic coupling is presented in this article. The principles of the technique and the detection structure were analyzed, and experiments were conducted using the gyroscope. The static results show that the maximum coup ... [Appl. Phys. Lett. 99, 251116 (2011)] published Fri Dec 23, 2011.
Categories: Optics news

Asymmetry of carrier transport leading to efficiency droop in GaInN based light-emitting diodes

Lasers, Optics, and Optoelectronics - Wed, 05/22/2013 - 00:20
David S. Meyaard, Guan-Bo Lin, Qifeng Shan, Jaehee Cho, E. Fred Schubert et al.
The effect of the asymmetry in carrier concentration and mobility is studied in GaInN pn-junction light-emitting diodes (LEDs). We propose and present experimental evidence that the asymmetry in carrier concentration and mobility, and associated high-level injection phenomena, cause efficiency droop ... [Appl. Phys. Lett. 99, 251115 (2011)] published Fri Dec 23, 2011.
Categories: Optics news

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