Pump–Probe Measurements of the Raman Gain Coefficient in Crystals Using Multi-Longitudinal-Mode Beams
Pump–Probe Measurements of the Raman Gain Coefficient in Crystals Using Multi-Longitudinal-Mode Beams
复制标题
DOI：
10.1109/jqe.2015.2503404
复制
发表时间：
2015-11
影响因子：
2.5
通讯作者：
A. Sabella;D. Spence;R. Mildren
中科院分区：
文献类型：
--
作者：
A. Sabella;D. Spence;R. Mildren
研究了多纵模干涉对泵浦探针拉曼增益测量的影响，作为激光线宽以及泵浦和探针时间结构之间相关性的函数。对于晶体的典型拉曼线宽，泵浦和探针之间形成的相关性增加了拉曼放大，超出了理想的单纵模情况，导致拉曼增益系数值增大。我们表明，先前使用的线宽校正因子仅对不相关光束和小增益因子有效。考虑到这些因素，在 1.864 μm 泵浦波长（偏振平行于 <110> 晶轴）下，金刚石的拉曼增益系数为 3.80 ± 0.35 cm/GW。
The effect of multi-longitudinal-mode interference on pump-probe Raman gain measurements is studied as the functions of laser linewidth and correlation between the pump and probe temporal structures. For Raman linewidths typical of crystals, correlations that develop between the pump and the probe increase the Raman amplification beyond the ideal single longitudinal mode case, leading to inflated Raman gain coefficient values. We show that the linewidth correction factors used previously are valid only for uncorrelated beams and small gain factors. Taking into account these considerations, a Raman gain coefficient for a diamond of 3.80 ± 0.35 cm/GW is reported at a pump wavelength of 1.864 μm (polarizations parallel to a 〈110〉 crystal axis).