检索结果-南通市图书馆

Research on stimulated brillouin scattering suppression based on multi-frequency phase modulation

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2009年第1期7卷 29-31页

作者：刘英繁吕志伟董永康李强 Institute of Opto-Electronics Harbin Institute of Technology

The method of generating equal-amplitude spectral lines by multi-frequency phase modulation is used in stimulated brillouin scattering （SBS） suppression. The spectra of three, five, seven, and eleven equalamplitude spectral lines are obtained in experiment with flatnesses less than 0.3 dB. Theoretical research on SBS suppression shows that the threshold power after modulation is in reverse proportion to the maximum square of amplitude moduli of fundamental frequency and the nth harmonic wave. The threshold powers of three, five, seven, and eleven equal-amplitude spectral lines are improved by 5.21, 8.36, 9.39, and 10.76 dB, respectively.

关键词： brillouin scattering Frequency domain analysis Light polarization Phase modulation Polarization Spectrum analysis Stimulated brillouin scattering Ultrasonics

Determination of elastic,piezoelectric,and dielectric constants of an R:BaTiO_3 single crystal by brillouin scattering

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第6期21卷 510-514页

作者：何小亢曾立波吴琼水张丽艳朱恪刘玉龙 Electronic Information School Wuhan University Institute of Physics Chinese Academy of Sciences

From the sound velocity measured using the brillouin scattering technique, the elastic, piezoelectric, and dielectric constants of a high-quality monodomain tetragonal Rh：BaTiO3 single crystal are determined at room temperature. The elastic constants are in fairly good agreement with those of the BaTiO3 single crystal, measured previously by brillouin scattering and the low-frequency equivalent circuit methods. However, their electromeehanical properties are significantly different. Based on the sound propagation equations and these results, the directional dependence of the compressional modulus and the shear modulus of Rh：BaTiO3 in the （010） plane is investigated. Some properties of sound propagation and electromechanical coupling in the crystal are discussed.

关键词： brillouin scattering elastic and piezoelectric constants Rh:BaTiO3 single crystal

Study on forward stimulated brillouin scattering in a backward pumped fiber Raman amplifier

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2004年第11期2卷 627-629页

作者：张在宣李来晓耿丹戴碧智金永兴刘红林 Insoo S.Kim 王剑锋吴孝彪方达伟庄松林 Optelectronics Technology Institute College of Optics and Electronics Information & Optical Technology Research Group

Strong multi-order forward stimulated brillouin scattering (SBS) has been observed in the backward pumped S-band distributed fiber Raman amplifier (PRA) with tunable narrow signal source (less than 100 MHz) when the pump power of FRA reached the SBS threshold. This does not obey the theory that only weak backward SBS lines exist according to the conservation of energy and momentum and the wave vector selected rule. This is because the sound waveguide characteristic weakens the wave vector rule, and the forward transmitted sound waveguide brillouin scattering lines are generated and amplified in FRA. When the pump power is further increased, 11 orders of SBS lines and comb-like profile are observed. For the excited line, the frequency is 197.2296 THz and the power is 0 dBm. The even order SBS lines are stronger than odd order SBS lines, the power of the 2nd and 4th order SBS lines is 1.75 dBm, which is 16 dB higher than that of the 1st and 3rd order SBS lines. The odd order SBS lines are named brillouin Rayleigh scattering lines.

关键词： brillouin scattering Optical communication Optical pumping Raman scattering Stimulated emission

Development of Fully-Distributed Fiber Sensors Based on brillouin scattering

在线全文

学校读者我要写书评

暂无评论

Photonic Sensors 2011年第1期1卷 54-61页

作者： Xuping ZHANG Yuangang LU Feng WANG Hao LIANG Yixin ZHANG Institute of Optical Communication Engineering Nanjing UniversityNanjing 210093China

brillouin scattering based optical fiber sensors(BOFS)have the unique advantages over other sensors such as long distance,fully distributed,and multi-parameter *** progresses on the development of BOFS technology in Nanjing University are *** key technologies to make BOFS with ultra-long distance,high spatial resolution,and fast measuring speed are discussed and realized.

关键词： brillouin scattering fully distributed optical fiber sensor brillouin optical time domain reflectometry strain monitoring

Dual-band bandpass tunable microwave photonic filter based on stimulated brillouin scattering

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optoelectronics Letters 2016年第4期12卷 276-279页

作者：李嘉琪肖永川董玮张歆东 State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin UniversityChangchun 130012 China Chongqing Optoelectronics Research Institute Chongqing 400060 China

A dual-band bandpass microwave photonic filter(MPF) based on stimulated brillouin scattering(SBS) is theoretically analyzed and experimentally demonstrated. Two separated tunable laser sources(TLSs) are employed to generate two passbands by implementing phase modulation to amplitude modulation conversion by using SBS induced sideband amplification. The center frequencies of both passbands can be independently tuned ranging from 1 GHz to 19 GHz. High resolution with 3 d B bandwidth less than 30 MHz and large out-of-band rejection about 40 d B under 25 m W optical pump power are achieved.

关键词： Bandpass filters brillouin scattering Microwave filters Modulation Optical pumping Phase modulation Surveying instruments

Range　and　Line　Resolved　brillouin　scattering　in　Pure　Water　Using　Pulsed　Nd：YAG　Laser

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1995年第2期B4卷 123-126页

作者： LIU Dahe QUAN Xiaohong(Department of Physics, Texas A & M University, College Station,Texas 77843-4242, USA) Texas A & M Univ Texas United States

ＲａｎｇｅａｎｄＬｉｎｅＲｅｓｏｌｖｅｄＢｒｉｌｌｏｕｉｎＳｃａｔｔｅｒｉｎｇｉｎＰｕｒｅＷａｔｅｒＵｓｉｎｇＰｕｌｓｅｄＮｄ：ＹＡＧＬａｓｅｒ￥ＬＩＵＤａｈｅ；ＱＵＡＮＸｉａｏｈｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈ... 详细信息

ＲａｎｇｅａｎｄＬｉｎｅＲｅｓｏｌｖｅｄＢｒｉｌｌｏｕｉｎＳｃａｔｔｅｒｉｎｇｉｎＰｕｒｅＷａｔｅｒＵｓｉｎｇＰｕｌｓｅｄＮｄ：ＹＡＧＬａｓｅｒ￥ＬＩＵＤａｈｅ；ＱＵＡＮＸｉａｏｈｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＴｅｘａｓＡ＆ＭＵｎｉ...

关键词： brillouin scattering high resolution spectrum

Characteristics of perfluorinated amine media for stimulated brillouin scattering in hundreds of picoseconds pulse compression at 532 nm

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2015年第6期13卷 73-77页

作者：哈斯乌力吉赵航林殿阳伟明吕志伟 National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of Technology

The characteristics of stimulated brillouin scattering （SBS） in perfluorinated amine media and the experimental structure used in hundreds of picoseconds pulse compression at 532 nm are demonstrated. A two-stage SBS pulse compression structure is adopted for this work. The compact double-cell SBS compression structure and the scattering media FC-70 are chosen to compress the incident light from 9.5 to about 1 ns in the first stage. Then, the light is used as the pumping source for the second pulse compression. In the second stage, using a single-cell SBS structure in a pulse compression system, perfluorinated amine media with different phonon lifetimes, such as FC-3283, FC-40, FC-43, and FC-70, are chosen to run the comparative experimental study. The narrowest com- pressed pulse times obtained are 294, 274, 277, and 194 ps; they respectively correspond to the above listed media. The average width of the compressed pulse width is 320 ps for FC-3283, with a fluctuation range of 87 ps. For FC-40, the average pulse width is 320 ps, with a fluctuation range of 72 ps. And for FC-43, the average pulse width is 335 ps, with a fluctuation range of 88 ps. However, the average pulse width is only 280 ps for FC- 70, with a fluctuation range of 57 ps. The highest energy reflectivity is more than 80% for all of the media. The experimental results show that a two-stage SBS pulse compression system has lower pump energy requirements, thus making it easier to achieve a compressed pulse waveform. The results also show that the shorter the phonon lifetime of the medium, the narrower the obtained compressed pulse width.

关键词： brillouin scattering Phonons Pulse compression Stimulated brillouin scattering

Stimulated brillouin scattering phase conjugation of light beams carrying orbit angular momentum(Invited Paper)

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2017年第3期15卷 21-23页

作者：陈旭东昌成成蒲继雄 Fujian Key Laboratory of Light Propagation and Transformation College of Information Science and Engineering Huaqiao University Xiamen 361021 China

We investigate the stimulated brillouin scattering （SBS） properties of light beams carrying orbit angular momentum （OAM）. The phase conjugation of light beams carrying OAM is experimentally achieved in an SBS mirror with a random phase plate. The spectrum and the pulse width compression of SBS light are measured. It is shown that the phenomena of pulse compression is observed and OAM conservation is confirmed in the SBS process. The OAM transfer from photons to phonons may find potential applications in photon-phonon conversion-based signal-processing schemes by using OAM multiplexing.

关键词： Angular momentum brillouin scattering Light Phonons Photons Signal processing Solid state lasers

Generation of high-energy 284 ps laser pulse without tail modulation by stimulated brillouin scattering

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2016年第9期14卷 67-70页

作者：刘照虹王雨雷王一锐远航白振旭王红丽刘瑞李森森张恒康周罗贤谭谈何伟明吕志伟 National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of Technology

We obtain the output of a 284 ps pulse duration without tail modulation based on stimulated brillouin scattering（SBS） pulse compression pumped by an 8 ns-pulse-duration, 1064 nm-wavelength Q-switched Nd：YAG laser. To suppress the tail modulation in SBS pulse compression, proper attenuators, which can control the pump energy within a rational range, are added in a generator-amplifier setup. The experimental result shows that the effective energy conversion efficiency triples when the pump energy reaches 700 m J to 51%, compared with the conventional generator-amplifier setup.

关键词： brillouin scattering Conversion efficiency Energy conversion Modulation Neodymium lasers Optical pumping Pulse compression Pumping (laser) Ultrashort pulses