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Dynamic lasing from all-organic two-dimensional photonic crystals

ADVANCED MATERIALS 2005年第23期17卷 2807-+页

作者： Jakubiak, R Tondiglia, VP Natarajan, LV Sutherland, RL Lloyd, P Bunning, TJ Vaia, RA USAF Res Lab Mat & Mfg Directorate Wright Patterson AFB OH 45433 USA Sci Applicat Int Corp Beavercreek OH 45431 USA Universal Energy Syst Inc Dayton OH 45432 USA

Optically pumped lasing of pyrromethene 597 in 2D columnar photonic crystals (PCs) derived from holographic polymer-dispersed liquid crystals (LCs, see Figure) exhibit resolution-limited linewidths of 1.9 nm and thresholds of less than 200 mu J cm(-2). Electric field modulation of the LC directors allows tuning of the laser mode over 5 nm. Use of PC properties that go beyond those associated with the photonic bandgap may lead to organic-based PCs for linear/nonlinear nanophotonics.

关键词： DISPERSED LIQUID-CRYSTALS HOLOGRAPHIC LITHOGRAPHY distributed-feedback LIGHT AMPLIFICATION GAIN-ENHANCEMENT POLYMER LASER

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INTEGRATED BURIED HETEROSTRUCTURE DFB LASER ARRAY FOR WDM SYSTEMS BASED ON RECONSTRUCTION EQUIVALENT CHIRP TECHNIQUE

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2015年第6期57卷 1278-1281页

作者： Tang, Song Lu, Jun Wang, Jeffery Liu, Yue Chen, Xiangfei Nanjing Univ Coll Engn & Appl Sci Microwave Photon Technol Lab Natl Lab Microstruct Nanjing 210093 Jiangsu Peoples R China ATG Technol Inc San Jose CA 95129 USA

A distributed-feedback semiconductor laser array with buried heterostructure waveguide based on reconstruction equivalent chirp technique is experimentally demonstrated. The fabricated six-element laser array has channel spacing of 800 GHz and well meets the International Telecommunication Union standard, with relatively low threshold and high efficiency. Good single-longitudinal mode operation has been achieved at high injection current (120 mA) and high temperature (80 degrees C), with side mode suppression ratios not lower than 40 dB, which is promising for the future wavelength division multiplexing systems. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1278-1281, 2015

关键词： distributed-feedback laser array wavelength division multiplexing international telecommunication union standard photonic integrated circuits

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Ultra-flexible multiband terahertz metamaterial absorber for conformal geometry applications

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OPTICS LETTERS 2013年第23期38卷 4988-4990页

作者： Yahiaoui, Riad Guillet, Jean Paul de Miollis, Frederick Mounaix, Patrick Univ Limoges XLIM CNRS UMR 6172 F-19100 Brive France Univ Bordeaux 1 LOMA CNRS UMR 5798 F-33405 Talence France

Standard optical lithography relying on clean room and microelectronic facilities is used to fabricate a thin-flexible metamaterial absorber, designed to operate at submillimeter wavelengths over the 0.1-1 THz frequency band. Large terahertz absorption has been demonstrated numerically and through experimental measurements with a maximum level of about 80%. We put emphasis in this present work on the use of single-sized "meta-cells" to achieve multiple absorption peaks. Furthermore, the use of a thin-flexible dielectric spacer makes it promising for stealth technology applications in order to disguise objects and make them less visible to radar and other detection methods. (C) 2013 Optical Society of America

关键词： Fiber optics sensors Fibers polarization-maintaining Lasers distributed-feedback Fiber Bragg gratings

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Mode resolved bend-loss analysis in few-mode fibers using spatially and spectrally resolved imaging

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OPTICS LETTERS 2015年第20期40卷 4583-4586页

作者： Leandro, Lorenzo Gruner-Nielsen, Lars Rottwitt, Karsten Tech Univ Denmark Dept Photon Engn DTU Foton DK-2800 Lyngby Denmark OFS DK-2605 Brondby Denmark

The increasing use of few-mode fibers for high-speed optical communication systems in space division multiplexing has created a need for mode resolved characterization of few-mode fibers. In this Letter, we present a new method to characterize the bend loss of the individual modes in a few-mode fiber. This procedure uses a simple setup for spatially and spectrally resolved imaging and allows the measurement of the bend loss of each and every guided mode at once. It does not require the use of mode converters in contrast to other methods. Results for graded-index two-and four-mode fibers are presented, together with comparisons against direct bend-loss measurements for the four-mode and standard single-mode fibers. (C) 2015 Optical Society of America

关键词： Fiber optics and optical communications Fiber characterization Fiber properties Lasers distributed-feedback

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Dual-wavelength diode laser with electrically adjustable wavelength distance at 785 nm

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OPTICS LETTERS 2016年第16期41卷 3694-3697页

作者： Sumpf, Bernd Kabitzke, Julia Fricke, Joerg Ressel, Peter Mueller, Andre Maiwald, Martin Traenkle, Guenther Leibniz Inst Hochstfrequenztech Photon Ferdinand Braun Inst Gustav Kirchhoff Str 4 D-12489 Berlin Germany

A spectrally adjustable monolithic dual-wavelength diode laser at 785 nm as an excitation light source for shifted excitation Raman difference spectroscopy (SERDS) is presented. The spectral distance between the two excitation wavelengths can be electrically adjusted between 0 and 2.0 nm using implemented heater elements above the distributed Bragg reflector (DBR) gratings. Output powers up to 180mWat a temperature of 25 degrees C were measured. The spectral width is smaller than 13 pm, limited by the spectrum analyzer. The device is well-suited for Raman spectroscopy, and the flexible spectral distance allows a target-specific adjustment of the excitation light source for shifted excitation Raman difference spectroscopy (SERDS).

关键词： Diode lasers Lasers distributed-feedback Raman spectroscopy Bragg reflectors

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Laser-induced breakdown spectroscopy determination of toxic metals in fresh fish

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APPLIED OPTICS 2016年第2期55卷 254-258页

作者： Ponce, L. V. Flores, T. Sosa-Saldana, M. Alvira, F. C. Bilmes, G. M. IPN CICATA Tecnol Laser Unidad Altamira Altamira 89600 Tamaulipas Mexico Ctr Invest Opt CONICET La Plata CIC Lab Ablac Limpieza & Restaurac Laser Buenos Aires DF Argentina Univ Nacl La Plata Fac Ingn RA-1900 Buenos Aires DF Argentina

A method based on laser induced breakdown spectroscopy (LIBS) for monitoring lead and copper accumulation in edible fish, particularly "tilapia del Nilo" (Oreochromis niloticus) is presented. The capability of this analytical method is compared with results obtained by atomic absorption spectrometry. Detection limits by LIBS are 25 parts per million (ppm) for Pb and 100 ppm for Cu, values that are below the maximum permissible levels of some international standards. Application of LIBS detection allows the development of portable instruments for contamination control of edible fish. (C) 2016 Optical Society of America

关键词： Spectrometers and spectroscopic instrumentation Lasers distributed-feedback Laser materials processing Spectroscopy laser induced breakdown

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Imaging system based on a tandem acousto-optical tunable filter for in situ measurements of the high temperature distribution

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OPTICS LETTERS 2016年第5期41卷 901-904页

作者： Machikhin, Alexander S. Zinin, Pavel V. Shurygin, Alexander V. Khokhlov, Demid D. Russian Acad Sci Sci & Technol Ctr Unique Instrumentat Ul Butlerova 15 Moscow 117342 Russia Natl Res Univ Moscow Power Engn Inst Ul Krasnokazarmennaya 14 Moscow 111250 Russia Univ Hawaii Hawaii Inst Geophys & Planetol 2525 Correa Rd Honolulu HI 96822 USA

We present, to the best of our knowledge, the first experimental demonstration of a new imaging system for in situ measurement of the two-dimensional (2D) distribution of the surface temperature of microscopic specimens. The main component of the system is an imaging tandem acousto-optical tunable filter (TAOTF) synchronized with a video camera. A set of TAOTF spectroscopic images (up to a few hundreds) is taken by the TAOTF imaging system to fit the measured spectral curves in each pixel to the Planck radiation function and determine the temperature and emissivity of the sample using the gray body approximation. It is experimentally shown that this technique provides aberration-free spectral imaging suitable for precise multispectral imaging radiometry (MIR). (C) 2016 Optical Society of America

关键词： Fiber optics sensors Fibers polarization-maintaining Fiber Bragg gratings Lasers distributed-feedback

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Low-threshold lasing in active opal photonic crystals

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OPTICS LETTERS 2013年第7期38卷 1046-1048页

作者： Reddy, M. Srinivas Vijaya, R. Rukhlenko, Ivan D. Premaratne, Malin Indian Inst Technol IITB Monash Res Acad Bombay 400076 Maharashtra India Indian Inst Technol Dept Phys Bombay 400076 Maharashtra India Monash Univ Dept Elect & Comp Syst Engn Adv Comp & Simulat Lab AxL Clayton Vic 3800 Australia Indian Inst Technol Dept Phys Kanpur 208016 Uttar Pradesh India

We theoretically study a low-threshold band-edge lasing in three-dimensional photonic crystals (PhCs) with a face-centered cubic lattice structure, using a complex-valued permittivity approach combined with the Korringa-Kohn-Rostoker method. We show that the lasing threshold at the low-frequency band edge is smaller than that at the high-frequency band edge for the first-order stop band of the PhC. We also analyze the impact of the number of the PhC's layers on the frequency of band-edge lasing and the lasing threshold near the first-order stop band in the GL direction, and demonstrate a broad tunability of the lasing frequency with change in the emission collection angle. The obtained results are beneficial for the performance enhancement of tunable, PhC-based chip lasers. (C) 2013 Optical Society of America

关键词： Numerical approximation and analysis Lasers distributed-feedback Photonic crystals

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Tunable optical microwave generation using self-injection locked monolithic dual-wavelength amplified feedback laser

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OPTICS LETTERS 2014年第22期39卷 6395-6398页

作者： Pan, Biwei Lu, Dan Sun, Yu Yu, Liqiang Zhang, Limeng Zhao, Lingjuan Chinese Acad Sci Inst Semicond Key Lab Semicond Mat Sci Beijing 100083 Peoples R China Chinese Acad Sci Inst Microelect Beijing 100029 Peoples R China

A tunable optical microwave generation scheme using self-injection locked monolithic dual-wavelength amplified feedback laser (AFL) is proposed and experimentally demonstrated. By using a dual-loop feedback scheme, the 3-dB linewidth of the optical microwave output resulting from mode beating is reduced from MHz to kHz scale. Optical microwave generation tunable from 30 to 38 GHz with 3-dB linewidth below 2 kHz is experimentally demonstrated. (C) 2014 Optical Society of America

关键词： Lasers distributed-feedback Lasers injection-locked Microwaves

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Polarization-encoded chirped pulse amplification in Ti:sapphire: a way toward few-cycle petawatt lasers

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OPTICS LETTERS 2016年第1期41卷 25-28页

作者： Kalashnikov, Mikhail Cao, Huabao Osvay, Karoly Chvykov, Vladimir Max Born Inst Nonlinear Opt & Short Pulse Spect D-12489 Berlin Germany ELI Hu Nkft H-6720 Szeged Hungary

The bandwidth of titanium sapphire (Ti:Sa) laser amplifiers can be greatly broadened with shaping the spectral gain via engineering the spectral polarization of amplified pulses and using both pi- and sigma-cross-sections. In a proof-of-principle experiment, an amplification bandwidth exceeding 85 nm at a gain of 200 was demonstrated. The accompanying computer modeling revealed that a polarization-encoded chirped pulse amplification scheme can be scaled to higher energies and thus can produce multijoule pulses with bandwidth close to 200 nm, making few-cycle petawatt Ti: Sa systems feasible. (C) 2015 Optical Society of America

关键词： Laser amplifiers Lasers distributed-feedback Lasers titanium Ultrafast lasers

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