Iliev Hristo, Chuchumishev Danail, Buchvarov Ivan, Petrov Valentin
Department of Quantum Electronics, Faculty of Physics, Sofia University, 5 James Bourchier Blvd.,BG-1164 Sofia, Bulgaria.
Opt Express. 2010 Mar 15;18(6):5754-62. doi: 10.1364/OE.18.005754.
Experimental results on passive mode-locking of a Nd:YVO(4) laser using intracavity frequency doubling in periodically poled KTP (PPKTP) crystal are reported. Both, negative cascaded chi((2)) lensing and frequency doubling nonlinear mirror (FDNLM) are exploited for the laser mode-locking. The FDNLM based on intensity dependent reflection in the laser cavity ensures self-starting and self-sustaining mode-locking while the cascaded chi((2)) lens process contributes to substantial pulse shortening. This hybrid technique enables generation of stable trains of pulses at high-average output power with several picoseconds pulse width. The pulse repetition rate of the laser is 117 MHz with average output power ranging from 0.5 to 3.1 W and pulse duration from 2.9 to 5.2 ps.
报道了在周期性极化铌酸锂（PPKTP）晶体中利用腔内倍频实现钕钇钒酸盐（Nd:YVO(4)）激光器被动锁模的实验结果。同时利用负级联χ（2）透镜效应和倍频非线性镜（FDNLM）实现激光锁模。基于激光腔内强度依赖反射的FDNLM确保了自启动和自持锁模，而级联χ（2）透镜效应有助于显著缩短脉冲宽度。这种混合技术能够在高平均输出功率下产生稳定的脉冲序列，脉冲宽度为几皮秒。激光器的脉冲重复频率为117 MHz，平均输出功率范围为0.5至3.1 W，脉冲持续时间为2.9至5.2 ps。
