Enhancement of Raman scattering by parametric mixing of the pump with its harmonic

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• 作者：S. Marchetti ; C. Gabbanini ; ^{carlo.gabbanini@ino.it}
• 关键词：Raman scattering ; Parametric mixing
• 刊名：Optics Communications
• 出版年：2012
• 期刊代码：50_00304018
• 类别：ph
• 出版时间：1 July, 2012
• 卷：285
• 期：15
• 页码：3312-3315
• 文件大小：1110 K

摘要

A strong focusing of the pump laser is generally used to reduce the Stimulated Raman Scattering (SRS) threshold, but it also produces a phase matching condition in the region of strong gain. This causes a large threshold for SRS in the near infrared due both to the increased diffraction limit and to the destructive interaction of antiStokes-Stokes processes. However the phase matching condition can be used to reduce the threshold by Raman parametric mixing (RPM) of the pump with the second harmonic generated by a fraction of pump. It this way we have observed a lowering of the threshold of about a factor 2.3 and an increase of the SRS of the pump.