Exploring Tail Removal of Passive Q-switched Pulse Nd:YAG Laser by Using Diffraction Intra-cavity Round Trip Loss

• Main Authors: He, Sheng-Ting, 何昇庭
• Other Authors: Chen, Yung-Fu
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/82621108341429678324

碩士 === 國立交通大學 === 理學院應用科技學程 === 105 === The technique of pulsed pumping millijoule laser is well-developed in ophthalmology field and the related application. In this thesis, we utilize flash-pumped source to excite the Nd:YAG crystal and insert Cr4+:YAG to be the satuable absorber as forming the Q-switched operation. The cavity is set by a plano-convex mirror and concave-convex mirror, which is an unstable cavity with 90-mm-long cavity length. We measure the total output energy, laser-induced air breakdown threshold energy and laser output signal in time domain by exploiting different combinations of the radius of curvature of front mirrors and output couplers. We demonstrate the experimental results and explain the relationship between the cavity mirrors and the threshold energy through the output pulse shape in temporal domain