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首页> 外文会议>Advanced Lassers and Systems; Proceedings of SPIE-The International Society for Optical Engineering; vol.6731 >SMALL SIGNAL SBS - AMPLIFICATION
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SMALL SIGNAL SBS - AMPLIFICATION

机译：小信号SBS-放大

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摘要

The amplification of small signals was investigated both experimentally and theoretically. The theoretical analysis was provided in terms of unsaturated regime. It is shown, that it is necessary to take into account the temporal shapes of interacting waves. When pump pulse duration is of the order of hupersound phonons lifetime, the Stokes pulse has duration in two times lower then pump. It is necessary to have time delay between input Stokes pulse and pumping pulse of the order of life time of hupersound phonons to have amplification maximum. Energy amplification ～ 2·10~9 was obtained experimentally when the energy of input signal was about 10~(-11) J. The affect of the active medium SBS - amplifier parameters on SBS threshold is investigated. The universality of expression for a threshold increment of amplification, valid in a big range of change of parameters is shown. The threshold increment of amplification in the light guide in which spontaneous noise can amplify in big solid angle is experimentally confirmed. Experiments on SBS amplification in the light guide of small signal images are carried out. Amplification coefficient ～ 10~6 is obtained without essential change of picture quality.
机译：小信号的放大在实验和理论上都进行了研究。根据不饱和状态提供了理论分析。结果表明，有必要考虑相互作用波的时间形状。当泵浦脉冲的持续时间约为声子声子寿命时，斯托克斯脉冲的持续时间比泵浦脉冲的持续时间短两倍。为了使放大倍数最大，有必要在输入斯托克斯脉冲与泵浦声子的寿命的数量级之间的时间延迟。当输入信号的能量约为10〜（-11）J时，通过实验获得了能量放大〜2·10〜9。研究了有源介质SBS-放大器参数对SBS阈值的影响。显示了在较大的参数变化范围内有效的扩增阈值增量的表达通用性。通过实验确定了自导噪声可以大立体角放大的光导中的放大阈值增量。在小信号图像的光导中进行了SBS放大的实验。获得的放大系数约为10〜6，而图像质量没有本质变化。

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