Efficient collinear frequency tripling of femtosecond laser with compensation of group velocity delay
Efficient collinear frequency tripling of femtosecond laser with compensation of group velocity delay
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DOI：
10.1088/1674-1056/18/10/036
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
王燕玲;周绪桂;吴洪;丁良恩
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文献类型：
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作者：
王燕玲;周绪桂;吴洪;丁良恩
本文提出了一种利用负单轴晶体的相对反常色散效应补偿群速度延迟的方法，并将其应用于超快激光场的非线性频率转换。采用双补偿三倍频共线结构，实验上实现了高效率的三次谐波产生。通过微调补偿板的入射角和光轴方向，在800 nm的输入光为70 fs脉冲宽度和6 mJ脉冲能量时，获得了中心波长为270 nm、光谱带宽为2 nm的紫外（UV）输出能量为0.32 mJ。蓝宝石激光器系统的光阑，对应于5.3%的800至270 nm的转换效率和1.6倍的改善，在三次谐波产生的UV波段相比，一般的传统配置。此外，当使用和优化来自钛宝石激光系统的18mJ的全能量时，紫外发射可以达到0.83mJ。
This paper demonstrates an approach that negative uniaxial crystal has a relative anomalous dispersion effect which can compensate group velocity delay, and applies this approach to nonlinear frequency conversion of an ultrafast laser field. High efficiency of the third harmonic generation is experimentally fulfilled by adopting a collinear configuration of doubing-compensation-tripling system. Through finely adjusting the incident angle and optical axis direction of the compensation plate, it obtains ultraviolet (UV) output energy of 0.32 mJ centered at 270 nm with spectral bandwidth of 2 nm when input beam at 800 nm was 70 fs pulse duration and 6 mJ pulse energy which was extracted from Ti: sapphire laser system by a diaphragm, corresponding to an 800-to-270 nm conversion efficiency of 5.3% and a factor-of-1.6 improvement in the third harmonic generation of UV band in comparison with a general conventional configuration. Furthermore, when the full energy of 18 mJ from a Ti: sapphire laser system was used and optimized, the UV emission could reach 0.83 mJ.