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Photonics Research

Photonics Research

| A joint OSA/Chinese Laser Press publication

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Accepted papers to appear in an upcoming issue

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Articles 1 to 5 of 5

January


(PBTD)Nanosecond-pulsed, multi-wavelength passively Q-switched ytterbium-doped bulk laser based on few-layer MoS2 saturable absorber

  • Fei Lou, Ru-Wei Zhao, Jingliang He, Zhitai Jia, Xian-cui Su, Zhao-Wei Wang, Jia Hou, and Baitao Zhang
  • received 11/14/2014; accepted 01/21/2015; posted 01/26/2015; Doc. ID 226807
  • [full text: PDF (942) KB)]
  • Abstract: A compact saturable absorber mirror (SAM) based on few-layer molybdenum disulfide (MoS2) nanoplatelets was fabricated, and successfully used as an efficient saturable absorber for the passively Q-switched solid-state laser at 1 μm wavelength. Pulses as short as 182 ns were obtained from a ytterbium-doped (Yb:LGGG) bulk laser Q-switched by the MoS2 SAM, which we believe to be the shortest one ever achieved from the MoS2 SAs based Q-switched bulk lasers. A maximum average output power of 0.6 W was obtained with a slope efficiency of 24%, corresponding to single pulse energy up to 1.8 μJ. The results indicate the promising potential of few-layer MoS2 nanoplatelets as nonlinear optical switch for achieving efficient pulsed bulk lasers.

Keywords (OCIS):

  • (140.3540) Lasers and laser optics : Lasers, Q-switched
  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (160.4330) Materials : Nonlinear optical materials
  • (160.4236) Materials : Nanomaterials

December


Investigation on Random Distributed Feedback Raman Fiber Laser with Linear Polarized Output

  • Xueyuan Du, hanwei zhang, Xiaolin Wang, Pu Zhou, and Zejin Liu
  • received 11/20/2014; accepted 12/27/2014; posted 01/07/2015; Doc. ID 227225
  • [full text: PDF (1007) KB)]
  • Abstract: A random distributed feedback fiber laser with linear polarized output at 1178nm is presented. Linear polarization is realized by fiber coiling in a half-opened cavity of a polarization maintaining random fiber laser structure. The single linear polarization laser output power reaches ~3W with PER >14dB. Further investigations on the coiling technique and additional feedback are also studied. So far as we know, this is the first reported linear polarized random distributed feedback Raman fiber laser.

Keywords (OCIS):

  • (060.2420) Fiber optics and optical communications : Fibers, polarization-maintaining
  • (140.3490) Lasers and laser optics : Lasers, distributed-feedback
  • (290.5870) Scattering : Scattering, Rayleigh

Raman tensor elements of wurtzite AlN

  • feng huang, Wei Zheng, Ruisheng Zheng, Honglei Wu, and Fadi Li
  • received 10/28/2014; accepted 12/17/2014; posted 01/07/2015; Doc. ID 225675
  • [full text: PDF (889) KB)]
  • Abstract: Angle dependence of optical phonon modes for m-plane (1100) and c-plane (0001) surface of an AlN bulk single crystal is investigated at room temperature by backscattering Raman spectroscopy for parallel and perpendicular polarization vectors of incoming and scattered light. Raman selection rules for wurtzite AlN are calculated according to measured scattering geometries to illustrate the angle dependence. The variations in intensities of phonon modes are discussed and compared to calculated scattering intensities, yielding the Raman tensor elements of several modes normalized to that of the E2 mode: |a/d|=1.8 and |b/d|=0.7, |c/d|=0.7, and |a/d|=0.4 for the A1(TO), E1(TO), and A1(LO) phonon modes, respectively. Furthermore, the Raman tensor elements of wurtzite AlN are compared with that of wurtzite ZnO reported in previous work, revealing the differences of Raman tensor between AlN and ZnO.

Keywords (OCIS):

  • (160.6000) Materials : Semiconductor materials
  • (290.5860) Scattering : Scattering, Raman
  • (290.5855) Scattering : Scattering, polarization

SIMO Detection Schemes for Underwater Optical Wireless Communication under Turbulence

  • Zhengyuan Xu, Weihao Liu, and Liuqing Yang
  • received 10/21/2014; accepted 12/14/2014; posted 01/27/2015; Doc. ID 225438
  • [full text: PDF (545) KB)]
  • Abstract: In underwater optical wireless communication (UOWC), channel is characterized by the abundant scattering/absorption effects and optical turbulence. Most studies on the UOWC are limited to the scattering/absorption effects. However experimental studies in the literature indicate that the underwater optical turbulence can cause severe communication quality degradation. In this paper, the UOWC channel with both scattering/absorption and turbulence taken into consideration is characterized, and a spatial diversity receiver scheme, say a SIMO scheme, based on a LED source and multiple detectors is proposed to mitigate the deep fading. The Monte-Carlo based statistical simulation method is introduced to evaluate the bit-error-rate (BER) performance of the system. It is shown that spatial diversity can reduce channel fading effectively and extend communication range remarkably.

Keywords (OCIS):

  • (060.0060) Fiber optics and optical communications : Fiber optics and optical communications
  • (010.4455) Atmospheric and oceanic optics : Oceanic propagation

November


Photonic Crystal Slabs in Flexible OLEDs

  • Martina Gerken and Arfat Pradana
  • received 08/06/2014; accepted 11/25/2014; posted 01/07/2015; Doc. ID 220337
  • [full text: PDF (1884) KB)]
  • Abstract: Photonic crystal slabs integrated into organic light emitting diodes (OLEDs) allow for the extraction of waveguide modes and thus an increase in OLED efficiency. We fabricated linear Bragg gratings with a 460-nm period on flexible polycarbonate substrates using UV nanoimprint lithography. A hybrid organic-inorganic nanoimprint resist is used that serves also as a high refractive index layer. OLEDs composed of a PEDOT:PSS polymer anode, an organic emission layer (PPV-derivative “Super Yellow”) and a metal cathode (LiF/Al) are deposited onto the flexible grating substrates. The effects of photonic crystal slab deformation in a flexible OLED are studied in theory and experiment. The substrate deformation is modeled using the finite-element method (FEM). The influence of the change in the grating period and the waveguide thickness under bending are investigated. The change in the grating period is found to be the dominant effect. At an emission angle of 20° a change in the resonance wavelength of 1.2% is predicted for a strain of 1.3% perpendicular to the grating grooves. This value is verified experimentally analyzing electroluminescence and photoluminescence properties of the fabricated grating OLEDs.

Keywords (OCIS):

  • (050.2770) Diffraction and gratings : Gratings
  • (160.4890) Materials : Organic materials
  • (160.5470) Materials : Polymers
  • (230.3670) Optical devices : Light-emitting diodes
  • (250.5230) Optoelectronics : Photoluminescence
  • (050.5298) Diffraction and gratings : Photonic crystals

Articles 1 to 5 of 5





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