Nd:YVO4声光调Q腔内倍频457 nm蓝光激光器

脉冲蓝光激光器在水下探测、水下通信和遥感方面有着重要的应用前景。根据高斯光束传输的ABCD矩阵,设计了对热效应不灵敏的Z型谐振腔。利用808 nm激光二极管(LD)端面抽运Nd:YVO4晶棒,在室温下实现了4F3/2→4I9/2准三能级激光谱线跃迁。通过声光调Q和LBO腔内倍频,获得了稳定的高重复频率、高峰值功率457 nm蓝光激光输出。当抽运功率为30 W时,在重复频率为10 kHz下,获得最大单脉冲能量为56 μJ ,脉冲宽度为217 ns,峰值功率达258 W; 在重复频率为20 kHz下,获得最大平均功率为760 mW,脉冲宽度为261 ns,峰值功率为146 W。在最大平均输出功率下测量了脉冲457 nm蓝光激光器的功率稳定性,20 min之内其最大不稳定度小于2%。

457 nm Blue Laser Generation by Intracavity Frequency Doubling of Acousto-Optically Q-Switched Nd:YVO4 Laser

Pulsed blue laser has important applications in underwater detection, underwater communication and remote sensing. According to the ABCD matrix of Gaussian beam's propagation, a Z-type cavity insensitive to thermal lens effect is designed. By use of 808 nm laser diode (LD), the 4F3/2→4I9/2 quasi-three-level transition in Nd:YVO4 crystal is realized at room temperature. Stable pulsed 457 nm blue laser with high repetition rate and high peak power is demonstrated by acousto-optically Q-switching and intracavity frequency doubling. When the incident pump power is 30 W, the maximum single pulse energy of 56 μJ, pulse duration of 217 ns and peak power of 258 W are achieved at 10 kHz; the maximum average power of 760 mW, pulse duration of 261 ns and peak power of 146 W are obtained at 20 kHz. The fluctuation of the blue laser power is less than 2.0% within the given 20 min at the maximum output power.