High Efficiency stable 213nm generation for LASIK application

Document Type

Conference Proceeding


Society of Photo-Optical Instrumentation Engineers


Computing, Health and Science


Electron Science Research Institute




This article was originally published as: Wang, Z. , Alameh, K. , & Zheng, R. (2005). High Efficiency stable 213nm generation for LASIK application. Proceedings of Photonics Aisa 2004. (pp. 200-205). Beijing, China. SPIE Bellingham. Original article available


213nm Solid-state laser technology provides an alternative method to replace toxic excimer laser in LASIK system. In this paper, we report a compact fifth harmonic generation system to generate high pulse energy 213nm laser from Q-switched Nd:YAG laser for LASIK application based on three stages harmonic generation procedures. A novel crystal housing was specifically designed to hold the three crystals with each crystal has independent, precise angular adjustment structure and automatic tuning control. The crystal temperature is well maintained at ~130°C to improve harmonic generation stability and crystal operation lifetime. An output pulse energy 35mJ is obtained at 213nm, corresponding to total conversion efficiency ~10% from 1064nm pump laser. In system verification tests, the 213nm output power drops less than 5% after 5 millions pulse shots and no significant damage appears in the crystals.