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arXiv 1804.04443physics.opticsphysics.ins-det
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利用Shack-Hartmann波前传感器测量80 MHz皮秒脉冲泵浦下Ti:Sapphire晶体的热透镜效应

Thermal lensing measurements of Ti: Sapphire crystal pumped at 80 MHz picosecond pulses by Shack-Hartmann wavefront sensor

Mukhtar Hussain, Tayyab Imran, Adam Borzsonyi

摘要:

当泵浦光聚焦到激光晶体上时,激光晶体中的热透镜效应占主导地位,从而引起局部加热效应。当晶体具有非均匀温度分布时,观察到的空间折射率变化。实验中采用中心波长为532 nm、重复频率为80 MHz、平均泵浦功率为25 ps的脉冲泵浦布儒斯特切割钛宝石晶体,通过衰减器控制泵浦功率,实现了晶体的热透镜效应。首先在~293 K温度下测量了热透镜效应,然后在~40 K温度下测量了热透镜效应。利用HASO 4夏克-哈特曼波前传感器,计算并测量了不同平均泵浦功率下的热透镜效应。

英文摘要:

The thermal lensing effects in the lasing crystal appear to be dominant when the pump laser focused on the lasing crystal which causes the local heating effect. The spatial refractive index variations observed if the crystal has non-uniform temperature distribution. In the present study, the demonstration of thermal lensing effect of Brewster-cut Ti: Sapphire crystal carried out when pumped by 25 ps pulses at 80 MHz repetition rate with 532 nm central wavelength, while the average pump power controlled by the attenuator. The thermal lensing effects measured first at the ~293 K temperature and later at ~40 K by using the cryogenic cooling system. The thermal lensing variations at different average pump power were calculated and measured by using the HASO4 Shack-Hartmann wavefront sensor.

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