YVO4晶体的高效受激拉曼散射

报道了YVO4晶体在532 nm、30 ps脉冲下的的高效受激拉曼散射。采用腔外单次通过方式测量了不同长度YVO4晶体1阶斯托克斯受激拉曼散射的阈值,并得到该晶体的稳态增益系数为16.0±0.5 cm/GW。实验中观察到2阶斯托克斯线(558.6 nm5、87.8 nm)和1阶反斯托克斯线(508.0 nm),受激拉曼散射的整体转换效率高于50%。     

Stimulated Raman Scattering of Light in Glycerol under Picosecond Laser Excitation

Journal of Russian Laser Research - We record stimulated Raman scattering spectra in chemically-pure glycerol with the formation of two Stokes satellites with equidistant Raman frequencies ν =...     

Stimulated Raman Scattering of Chirped Ti:Sapphire Laser Pulses in BaWO4 Crystal

Russian Physics Journal - Spectrum transformation of a chirped Ti:sapphire laser pulse stretched to 0.2 ns (initial duration of a transform-limited pulse of 90 fs) was experimentally studied in a...     

Quantum Stimulated Raman Scattering

The quantum field theory of stimulated Raman scattering is formulated. It is shown to give the correct classical limit. Ilowever, the quantum growth rate is bigger. An additional physical process of creation of two plasmons from two photons is intrinsically predicted by the theory.     

Intracavity Stimulated Low-Frequency Raman Scattering

Intracavity stimulated low-frequency Raman scattering on elastic vibrations of submicrometer latex particles in an aqueous suspension is experimentally implemented for the first time.     

Solitons in Stimulated Raman Scattering

The semiclassical equations of SRS are derived by the following method: The many-level molecule is described by the Schrödinger equation and subsequently all amplitudes but those of the essential two levels are eliminated by approximate integration. Especially the case of equal group velocities for pump and Stokes wave is considered. Terms describing a frequency shift due to dynamical Stark effect and a change of refraction index by vibrational excitation can be removed by a suitable transformation. Under various, physically different, assumptions the system of molecular and field equations is reduced to the equations describing a quasimonochromatic pulse propagating in a resonant two-level system, and in this way we can find a rich manifold of solutions. E.g., the 2π-pulse of self-induced transparency can be transferred to SRS. By other assumptions we are led to equations defining the Bäcklund transformation for the sine-Gordon equation. For this case also soliton type solutions can be constructed.     

拉曼增益系数可分离光纤中的受激拉曼散射

给出了拉曼增益系数分离光纤的定义,在考虑了N个单色光之间的两两受激拉曼散射,得到了这种光纤中单向传输的N个不同的单色光之间的受激拉曼散射（SRS）稳态耦合波方程的解析解。它适用于各单色光功率任意大小、光频率分布不均匀时的一般情况。这一结果可应用于光纤通信系统、拉曼光纤放大器和拉曼光纤激光器的设计与分析。最后把解析解与数值解进行了比较,两者取得了很好的一致。     

Coaxial Multi-Wavelength Generation in YVO_4 Crystal with Stimulated Raman Scattering Excited by a Picosecond-Pulsed 1064 Laser

The multiwavelength characteristics of stimulated Raman scattering(SRS) in YVO_4 crystal excited by a picosecond laser at 1064 nm are investigated theoretically and experimentally. Laser output with seven wavelengths is achieved coaxially and synchronously at 894, 972, 1175, 1312, 1486, 1713 and 2022 nm in a YVO_4 crystal. The maximum total Raman output energy is as high as 2.77 m J under the pump energy of 7.75 m J. A maximum total Raman conversion efficiency of 47.8% is obtained when the pump energy is 6.54 m J. This is the highest order of Stokes components and the highest output energy generated by YVO_4 reported up to date. This work expands the Raman spectrum of YVO_4 crystal to the near-IR regime, with seven wavelengths covered at the same time,paving the way for new wavelength generation in the near-IR regime and its multiwavelength application.     

液芯波导中受激动力学散射与受激拉曼散射的竞争

研究了液芯波导中受激拉曼散射和受激动力学散射的阈值随泵浦激光脉宽的变化，发现受激动力学散射的阈值随泵浦脉冲前沿增长率增大而下降。研究了受激动力学散射和受激拉曼散射的竞争，结果表明受激动力学散射可分解为两种成分，其中与瞬态泵浦功率密度增长率相关的成分在大于阈值的泵浦脉冲前沿处于竞争优势，与瞬态泵浦功率密度相关的成分在高泵浦功率密度处于竞争优势，并讨论了其相应的机制。     

All-Fiber Ultra-Fast Switching Using Stimulated Raman Scattering

We propose a method for all-fiber ultra-fast switching using stimulated Raman scattering. It is based on the transference of energy from the signal as pump to the control signal as first Stokes by stimulated Raman scattering. In the absence of a control signal, the transference of energy from the pump signal to the generated first Stokes is negligible, which results in high output power at the pump signal wavelength. To minimize the walk-off problem between two wavelengths, we chose pump signal and control signal to be equally spaced on opposite sides of the zero dispersion wavelength of the fiber. Based on this assumption, the all-fiber ultra-fast optical switch with low power consumption and high output extinction ratio can be realized.     

掺铒石英光纤中的受激拉曼散射

掺铒石英光纤中的受激拉曼散射刘邦群高晖＊刘祖荫王琳（武汉大学物理系武汉４３００７２）（＊武汉物理数学研究所武汉４３００７２）ＳｔｉｍｕｌａｔｅｄＲａｍａｎＳｃａｔｅｒｉｎｇｉｎＥｒ－ｄｏｐｅｄＳｉｌｉｃａＦｉｂｅｒＬｉｕＢａｎｇｑｕｎ，ＧａｏＨｕｉ＊...     

热散焦效应对甲烷后向受激喇曼散射的影响

采用单纵模Nd:YAG二倍频激光泵浦,研究了CH4气体中的受激喇曼散射．实验发现,当激光的重复频率为2 Hz,1．1 MPa CH4中,泵浦能量为95 mJ时,后向一级斯托克斯(BS1)的量子转化效率可达73％,并且由于激光脉冲的张弛振荡,BS1的脉宽被压窄到1．2 ns,峰值功率达到了泵浦光功率的2．7倍,其光束质量大大优于泵浦光．在同样条件下,而重复频率为10 Hz时,BS1的量子转化效率降低为36％,但对光束质量影响不大,这是因为BS1呈现为与泵浦光波前翻转的复制光波,可以补偿热畸变．研究结果表明,如果设计一个CH4／He混合气体的带封闭循环冷却系统的高性能630 nm喇曼激光器,可能有其实际应用价值．     

Fundamental Studies of Stimulated Raman Scattering and Adaptive Optics on the Basis of Stimulated Light Scattering

Some results associated with the fundamental investigations of stimulated scattering of light in various media are reported. A number of problems of adaptive optics based on stimulated scattering is studied. Concrete results of experimental investigations of physically important characteristics of conventional (spontaneous) and stimulated Raman scattering are presented and discussed. Among them are the scattering indicatrix and the relations between the phases of laser radiation incident on a substance and stimulated scattering. These results were first obtained in the G. S. Landsberg Optical Department of the P. N. Lebedev Physical Institute of the Russian Academy of Sciences. Data on excitation sources and the radiation detection technique are systematized. The main characteristics of spontaneous Raman scattering and forward and backward stimulated Raman scattering (energy parameters, pulse duration, pulse shape, divergence, brightness, spectral width, far- and near-field intensity distributions) are presented. The results on dynamic holography, phase conjugation of light in stimulated scattering, and reconstruction and recording of information (images) with the help of amplifying dynamic holograms are presented. The physical mechanisms responsible for the interference field recording and the phase conjugation of pump radiation in stimulated light scattering are discussed. The data on phase conjugation for stimulated scattering excited by picosecond optical pulses and the results associated with the effect of excitation geometry on the optical phase conjugation in the case of stimulated scattering excited by nanosecond pulses are presented.     

外腔式SrWO4拉曼激光器的输出特性研究

研究了外腔式SrWO4拉曼激光器在ns脉冲抽运下的输出特性。利用主动调Q的Nd∶YAG激光器产生的脉冲宽度为11.7 ns,输出能量为80 mJ的激光作为抽运源,拉曼激光谐振腔采用平平腔,实验采用4片对一阶斯托克斯脉冲和二阶斯托克斯脉冲不同反射率的输出耦合镜,测量了输出能量与抽运能量的关系,计算了转换效率与抽运能量的关系。当输出耦合镜对一阶斯托克斯脉冲的反射率为39.9%时,实验得到一阶斯托克斯脉冲的最大能量和转换效率分别为23.9 mJ和36.2%,当输出耦合镜对一阶斯托克斯脉冲和二阶斯托克斯脉冲的反射率分别为80.5%和12.4%时,得到二阶斯托克斯脉冲的最大输出能量和转换效率分别为16.4 mJ和25.4%,典型的一阶斯托克斯脉冲和二阶斯托克斯脉冲的脉冲宽度分别为6.1 ns和5.8 ns。     

1 342 nm激光泵浦光子晶体光纤受激喇曼散射的实验研究

利用调Q Nd∶GdVO4 激光器为泵浦源,对100 m非线性光子晶体光纤中受激拉曼散射谱的形成过程进行了实验研究.随着泵浦功率的增加,在中心~1 575 nm处得到一个宽带光谱,并观察到光谱内部出现能量红移现象,使得光谱能量从1 546 nm处转移到1 615 nm.     

All-Fiber Optical Signal Inversion Using Stimulated Raman Scattering

We propose a method for all-optical signal inversion by means of stimulated Raman scattering (SRS). The idea is based on the transference of energy from the logic state #x201C;1#x201D; to the second stokes and making the logic state #x201C;0#x201D; into logic state #x201C;1#x201D; by receiving energy from the pump through SRS. According to the numerical simulation, a continuous wave pump source of LOW at 1453 nm and a few hundred meters of highly nonlinear fiber are required to invert an input signal at 1555 nm. The optical signal is inverted with high on-off contrast ratio.     

受激拉曼散射中的二阶量子关联

利用全量子理论和多模受激拉曼散射模型，研究了拉曼放大中，考虑泵浦光耗散时，斯托克斯光和泵浦光二阶量子关联函数随相互作用距离变化的特性，在不计及色散的影响时，斯托克斯光和泵浦光的二阶量子关联函数的变化主要取决于输入斯托克斯光和泵浦光的光强比，在极限情况下，本文的计算结果与拉曼产生的计算结果和经典耦合波理论的计算结果相符合。     

Stimulated Raman Scattering in Hydrogen Using Capilary Cell

Abstract

Stimulated Raman Scattering processes have been studied and intense Stokes and anti—Stokes laser lines have been observed in a capillary Raman cell filled with molecular hydrogen and pumped by the third harmonic of the Nd:YAG laser at wavelength ?D = 355 nm. Various parametric studies have been performed to establish an optimum condition for the best operation of the Raman laser. The observation of higher—order Stokes and anti—Stokes has been explained on the basis of four—wave mixing and/or cascade energy transfer processes.     

Multifrequency Stimulated Raman Scattering on Rotational Transitions of Molecules

Journal of Experimental and Theoretical Physics - The theory of multifrequency stimulated Raman scattering (SRS) of light on rotational transitions of molecules, which are simulated by a...     

Compensations of Stimulated Brillouin Scattering Effect with Stimulated Raman Effect in Distributed EDFA

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