Fabrication and optimization of high-power and high-repetition-rate all-solid-state UV laser: investigation of the long-term stability

• Main Authors: Li, Sheng-Chao, 李昇晁
• Other Authors: Chen, Yung-Fu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/49994723440924865028

碩士 === 國立交通大學 === 理學院應用科技學程 === 100 === This thesis provides the comprehensive concept of the fabrication and optimization of the high-power, high-repetition-rate Q-switched solid-state UV laser. We use an acousto-optically Q-switch and adopt a flat-flat cavity design to scale up of the output power and generate a nearly diffraction-limited fundamental beam at 1064 nm. With this optimized actively Q-switched laser, we perform the extracavity harmonic generations to obtain the UV radiation, where the maximum output power of approximately 3.7 W is achieved under an incident pump power of 26 W and a pulse repetition rate of 40 kHz. A test of the long-tern stability of this solid-state UV laser is conducted subsequently. It is experimentally found that the continuous motion of the LBO crystal together with the avoidance of the dust and humidity can remarkably stabilize the output power at 355 nm and make the lifetime of the UV laser to be considerably improved over an 100-hours-long operation.