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为了获得1.058um激光的高效输出,对皮秒脉冲激光(波长808nm)激发下钕玻璃荧光对乙醇的受激拉曼散射(SRS)效应的放大特性进行了实验研究。分别研究了钕玻璃长度及泵浦光强度对stokes波增益特性的影响。结果表明:随着钕玻璃长度的增加,辐射增强效应越明显,当钕玻璃的长度增加到29cm时,808nm泵浦光几乎消失殆尽,而1.058um的一阶stokes波功率放大因子为4.98;辐射增强效应随着泵浦光强度的增加而增加,当泵浦光出射强度为11mj时,能量转换效率约为20%。对荧光共振放大SRS的物理机制进行了分析讨论。
In order to obtain the high efficiency output of 1.058um laser, the amplification characteristics of stimulated Raman scattering (SRS) effect of neodymium glass fluorescence excited by picosecond pulsed laser (wavelength 808nm) were experimentally studied. The effects of the length of neodymium glass and the intensity of pump on the gain characteristics of stokes wave were studied. The results show that as the length of neodymium glass increases, the radiation enhancement effect becomes more obvious. When the length of neodymium glass increases to 29 cm, the pump light at 808 nm almost disappears, while the first - order stokes wave power amplification factor of 1.058 um is 4.98. The radiation enhancement effect increases with the increase of pump light intensity. When the pump light emission intensity is 11mj, the energy conversion efficiency is about 20%. The physical mechanism of fluorescence resonance amplification of SRS is analyzed and discussed.