中国物理B ›› 2003, Vol. 12 ›› Issue (11): 1246-1250.doi: 10.1088/1009-1963/12/11/311
陈晓波1, 王凌1, 吕兰斌2, 张治国2, 杨国桢2, Zhu Jane G.3, 杜为民3
Chen Xiao-Bo (陈晓波)a, Wang Ling (王凌)a, Lü Lan-Bin (吕兰斌)b, Zhang Zhi-Guo (张治国)b, Zhu Jane G.c, Du Wei-Min (杜为民)c, Yang Guo-Zhen (杨国桢)b
摘要: The 946nm diode-pump microchip self-Q-switched laser of a chromium and neodymium codoped yttrium aluminum garnet crystal material (Cr^{4+}Nd^{3+}:YAG) is studied, especially about its physical mechanism of operation. The {}^4F_{3/2}→{}^4I_{9/2} transition of Nd^{3+} ion is beneficial to achieving laser oscillation in a quasi-three-level system based on coating the cavity mirrors of the microchip with films that suppress the 1064nm operation and enhance the 946nm laser. The Cr^{4+} ion is a saturable absorber. The initial loss N_{t1} is high, which acts as the threshold for laser oscillation. The stable loss N_{t2} is low because the Cr^{4+} ion is acceleratively bleached by the fast enhancement of the oscillating laser. The high N_{t1}, small N_{t2} and fast progresses permit the oscillating laser of the Cr^{4+}Nd^{3+}:YAG to have a good self-Q-switched property whose full width at half maximum is about 4.2ns. Its highest laser power is about 5.7mW. Its peak power is about 150W. Its good fundamental transverse TEM_{00} mode results from the absorption bleaching established by both the pump and oscillating lasers, which suppress other transverse mode and allow the oscillation only in the fundamental transverse TEM_{00} mode.
中图分类号: (Microcavity and microdisk lasers)