High efficiency and good beam quality of electro-optic, cavity-dumped and double-end pumped Nd:YLF laser

摘要

In this paper, we describe a Nd:YLF laser based on high-speed RTP electro-optical cavity dump- ing technique. Two home-made 150 W fiber pump modules are used from both sides to pump Nd:YLF crystal. Coupling systems are the key elements in end-pumped solid-state lasers, the aberrations of which greatly affect the efficiency of the lasers. In order to get high efficient and good quality laser output, the optical soft- ware ZEMAX is used to design a four-piece coupling system. When the pumped energy is 32 mJ at the repe- tition rate of 1 Hz, the output energy is 6.5 mJ with 2.5 ns pulse width. When the pumped energy is 13.1 W at the repetition rate of 200 Hz, the output energy is 2.2 W with small M2 factor where is 1.04, and is 1.05, and the light-light conversion efficiency is up to 16.8%.