We have implemented active feedback control in a Q-switched diode-pumped Nd:YVO4 laser by monitoring the fluorescence intensity from the laser crystal. When the initial inversion level indicated by the detected fluorescence has reached a predetermined value, Q switching is initiated. This scheme allowed us to vary the reproducibility of the output pulse peak power and pulse width. The novel active Q-switching approach can reduce the shot-to-shot variations of the output pulse peak power and the pulse width.
© 2000 Optical Society of America
Original Manuscript: July 6, 1999
Revised Manuscript: October 26, 1999
Published: February 20, 2000
Wenjie Xie, Yee-Loy Lam, Yuen-Chuen Chan, Siu-Chung Tam, Jianhui Gu, Feng Zhou, Hongru Yang, and Gang Zhao, "Fluorescence feedback control of an active Q-switched diode-pumped Nd:YVO4 laser," Appl. Opt. 39, 978-981 (2000)