共查询到19条相似文献,搜索用时 109 毫秒
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探讨一种基于非线性光学相位共轭特性的布里渊增强四波混频技术,由于具有对微弱信号无延迟、高增益的反射特性,布里渊增强四波混频技术在激光探测方面具有良好应用前景. 相似文献
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对向列相液晶四波混频进行了理论分析,总结了提高向列相液晶四波混频衍射效率的方法,评述了其相位共轭的研究现状和前景. 相似文献
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主要研究了单缀饰四波混频信号的频率控制。首先,通过扫描探测场失谐及扫描缀饰场失谐两种方法,分别获得四波混频信号的Autler-Townes分裂和增强抑制现象;接着,在零失谐、小失谐和大失谐三个位置处,对比了两种扫描方法;在扫描缀饰场失谐时,观察到四波混频信号从纯抑制到半增强半抑制的转化过程;最后,通过对比发现,当探测场失谐越大时,缀饰场的缀饰效应就越弱。研究结果表明,相比于扫描探测场失谐,扫描缀饰场失谐的方法能实现对缀饰效应的直接测量。 相似文献
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光纤式相干拉曼散射成像光源研究进展 总被引:2,自引:0,他引:2
相干拉曼散射具有非侵入、无标记、化学特异性的优点,广泛用于生物组织成像、药代动力学等领域。主要介绍了光纤式相干拉曼散射(CRS)成像光源的实现方式及特点,总结了超连续谱展宽、孤子自频移和四波混频技术在提高双色超短脉冲输出功率、调谐范围、光谱分辨率方面的新进展。报道了基于四波混频的光参量振荡技术在产生可调谐双色超短脉冲方面的最新进展,采用全保偏光纤光路和光子晶体光纤,结合色散滤波和偏振操控技术,获得时间自同步、空间自重合、波长可调谐的双色超短脉冲,可实现脂类、蛋白和核酸的非侵入、无标记光谱检测与成像,为实现结构紧凑、使用方便、环境稳定的CRS提供了一个有效的技术途径。 相似文献
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本文对陆上级联接掺铒光纤放大器(EDPA)波分复用光纤通信系统中国波混频所造成的各个光信道光信噪比的恶化提出了一套计算方法,并结合常规单模光纤及一种特殊设计的色散位移光纤进行了分析计算。结果表明:在四波混频所引入的光信噪比恶化中,因新生频率分量导致的噪声增加一般远大于光信号功率的减弱。不等信道间隔划分能有效地避免四波混频的影响,而光滤波器的带宽应在允许范围内尽量压窄。对采用色散补偿技术的级联EDFA波分复用系统,在同一光中继段内,使常规单模光纤置于特殊设计的色散位移光纤之前,能进一步减少四波混频带来的光信噪比的恶化。 相似文献
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布里渊增强四波混频组束研究进展 总被引:1,自引:1,他引:0
布里渊增强四波混频(BEFWM)不仅反射率高,而且没有阈值限制,系统稳定性也好,布里渊增强四波混频组束是获得高功率激光的重要手段之一。介绍了布里渊增强四波混频位相共轭组束的原理及研究进展。 相似文献
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布里渊增强四波混频(BEFWM)不仅反射率高,而且没有阈值限制,系统稳定性也好,布里渊增强四波混频组束是获得高功率激光的重要手段之一。介绍了布里渊增强四波混频位相共轭组束的原理及研究进展。 相似文献
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DFB半导体激光器的非简并四波混频理论分析 总被引:1,自引:1,他引:0
建立λ/4相移的DFB-LD的非简并四波混频模型,由耦合波方程分析了信号光、共轭光的前向、后向光波形式,突破以往忽略各光波的反射成分造成的缺陷.在中度耦合系数等条件下得到泵浦光强分布图和信号光、共轭光的透射增益和反射增益图,结果表明泵浦-信号光失谐频率在4THz范围内能获得-20dB以上的波长转换效率. 相似文献
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《Lightwave Technology, Journal of》2008,26(14):2128-2135
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Xiaosheng Xiao Ping Shum Nazemosadat E.S. Changxi Yang 《Photonics Technology Letters, IEEE》2008,20(14):1231-1233
The output signal and idler pulses generated by dispersion-shifted-fiber-based four-wave mixing (FWM) with pulsed signal input are analyzed. A set of analytical expressions for the amplitude and phase of the output pulses is derived. Analytical analysis shows that the generated idler pulse is far away from the phase conjugation of the input signal, and that the output signal is not an amplified replica of the input signal. These phenomena are due to both the phase distortion caused by self- and cross-phase modulation and the temporal envelope broadening resulting from pump depletion. Besides, in the frequency domain, the spectral inversion between signal/idler will be destroyed. The implications of the phase and shape distortions in all-optical signal processing by FWM are discussed. The induced phase distortions of idler pulses in dual pumps case are found to be much smaller than those of the single-pump case. 相似文献
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Yan Yan Changxi Yang 《Lightwave Technology, Journal of》2009,27(22):4954-4959
We report an experimental and theoretical investigation of the four-wave mixing (FWM) process between a coherent signal light and an incoherent pump light in a highly nonlinear fiber. In the experiment, two main phenomena are observed: 1) the peak power of the spectrum of the coherent signal light decreases along the fiber rather than be amplified; 2) the spectrum of the coherent signal is broadened. A theory of the FWM process between incoherent pump and coherent signal is proposed by considering the incoherence of the pump which has amplitude and phase fluctuations. The theoretical results agree with the experimental results. 相似文献
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The influence of the stimulated Raman scattering in the four-wave mixing process in high birefringent fibers is theoretically analyzed. We consider the dual pump configuration in both co-polarized and orthogonal polarization schemes and treat simultaneously the stimulated Raman scattering and the four-wave mixing processes. The obtained results are valid even when the shift between the pumps and signal lies inside the Raman band. Results show that when the phase-matching condition is achieved the generation of the idler wave is mostly dependent on the real part of the fiber nonlinear response function, whereas the amplification of the signal wave is mostly dependent on the imaginary part. Results also show that when the phase-matching condition is satisfied the optical power evolution of the signal and idler waves for small frequency detunings are mostly described by the anisotropic Raman response of the fiber, whereas for high frequency detunings the isotropic response dominates. Our analysis also shows that the stimulated Raman scattering can increase the efficiency of the four-wave mixing process, for certain frequency detunings. 相似文献