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Spectral shift of Raman generation band in a Bessel pump beam

机译:贝塞尔泵浦光束中拉曼产生谱带的光谱偏移

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A spectral shift in the first Stokes generation band has been observed at stimulated Raman scattering in anBessel light beam. Under nanosecond pulse excitation in barium nitrate crystal, the Stokes emission propa-ngating along the Bessel beam axis has been found to be frequency shifted toward the blue side by 3.7 GHznwith respect to the Stokes emission propagating along the surface of a cone. Numerical data have shownnthat the observed frequency shift is directly related to the contribution of the real part of the Raman sus-nceptibility to the refractive index. This contribution causes an increase in the Stokes gain out of exact Ra-nman resonance owing to induced focusing, which inhibits diffraction spread of generated light and thus pro-nvides its better spatial overlap with the pump beam. © 2008 Optical Society of America
机译:在贝塞尔光束中的受激拉曼散射下,观察到了第一个斯托克斯生成带中的光谱偏移。在硝酸钡晶体中纳秒脉冲激发下,相对于沿圆锥体表面传播的斯托克斯发射,沿着贝塞尔光束轴传播的斯托克斯发射被发现向蓝侧偏移了3.7 GHzn的频率。数值数据表明,观察到的频移与拉曼磁化率实部对折射率的贡献直接相关。由于引起的聚焦,这种贡献使斯托克斯增益由于精确的Ra-nman共振而增加,这抑制了所产生的光的衍射扩散,从而提供了其与泵浦光束更好的空间重叠。 ©2008美国眼镜学会

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