20-Hz operation of an eye-safe cascade Raman laser with a Ba(NO3)2 crystal
20-Hz operation of an eye-safe cascade Raman laser with a Ba(NO3)2 crystal
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DOI：
10.1007/s003400200832
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发表时间：
2002-04
期刊：
影响因子：
--
通讯作者：
N. Takei;S. Suzuki;F. Kannari
中科院分区：
文献类型：
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作者：
N. Takei;S. Suzuki;F. Kannari
本文报道了用1.064 μ mNd：YAG激光泵浦Ba（NO3）2晶体，获得了1.598 μm人眼安全的三阶斯托克斯拉曼激光器。我们观察到在20 Hz下连续操作的前50 s期间输出能量显著降低。能量下降是初始三阶斯托克斯输出的1.76%。我们证实了负热透镜和热致双折射晶体。采用与热透镜曲率匹配的凹面腔镜，在20 Hz处获得了11 mJ的输出能量。在泵浦功率为45 MW/cm ~ 2（0.9 J/cm ~ 2）时，获得了最高转换效率为15.5%的TEM 00输出。
Operation of a 1.598-μm eye-safe third-Stokes Raman laser with a Ba(NO3)2crystal pumped by a 1.064-μm Nd:YAG laser is described. We observed a substantial decrease in the output energy during the first 50 s of the continuous operation at 20 Hz. The energy drop is ∼76% of the initial third-Stokes output. We confirmed negative thermal lensing and thermally induced birefringence in the crystal. With a concave cavity mirror at a matched curvature to the thermal lensing, we obtained an output energy of 11 mJ at 20 Hz. TEM00output was also obtained with a smaller pump-beam diameter with a highest conversion efficiency of 15.5% for a pumping power of only 45 MW/cm2(0.9 J/cm2).