中国激光, 2006, 33 (6): 748, 网络出版: 2006-06-13
离轴切割Nd:YVO4晶体的激光特性
Characteristics of Off-Axially Cut Nd:YVO4 Crystal for Laser
激光技术 激光二极管抽运 离轴切割 被动调Q 模式竞争 laser technology laser diode pump off-axially cut Q-switched mode competition
摘要
通过比较a切,45°切割Nd:YVO4晶体连续(CW)和以Cr4+:YAG晶体为被动调Q器件激光器的输出特征,发现Nd:YVO4晶体在激光器中既作为增益介质,又作为双折射o光,e光分裂器件。在不同的运转条件下,o光,e光偏振模式相互竞争,导致离轴晶体在连续运转时表现出a切晶体的特征,有较小的阈值、光-光转换效率高;在被动调Q运转时,则表现出c切晶体的特征,在1340 mW的激光二极管(LD)抽运功率下,可以获得峰值功率0.6 kW,重复频率为18.7 kHz,脉宽为6.5 ns的脉冲。
Abstract
The characteristics of 45°-off-axially-cut and a-cut Nd:YVO4 crystal, were compared for continuous wave (CW) and passively Q-switching operations by Cr4+:YAG crystal as the intracavity saturable absorber. By analyzing the experimental results, the 45°-off-axially-cut Nd:YVO4 exhibited parts of properties of the a-cut and c-cut crystals for CW passively Q-switching operations respectively, due to the competition between π polarization and σ polarization simulated emissions. With the laser diode (LD)-pump power of 1340 mW, a peak power of 0.6- kW with a 6.5-ns pulse width and 18.7-kHz repetition rate was obtained.
陈浩, 闫长春, 王占新, 曾和平. 离轴切割Nd:YVO4晶体的激光特性[J]. 中国激光, 2006, 33(6): 748. 陈浩, 闫长春, 王占新, 曾和平. Characteristics of Off-Axially Cut Nd:YVO4 Crystal for Laser[J]. Chinese Journal of Lasers, 2006, 33(6): 748.