Spatial chirp and angular dispersion of a laser crystal for a four-mirror cavity Kerr-lens mode-locked laser.
We describe oscillating loops in a laser cavity and optical paths in a laser crystal of different wavelength rays for a four-mirror cavity Kerr-lens mode-locked laser. The relation between different wavelength ray paths and laser resonator parameters is deduced. The analytical expressions of second- and third-order dispersion including angular dispersion of the crystal are presented. The variations of group-delay dispersion (GDD) and third-order dispersion (TOD) with cavity parameters are calculated exactly. The calculation shows that GDD and TOD increase rapidly when the spacing between two folding mirrors approaches the boundary of a cavity stability zone. The rapid dispersion increase influences the mode-locked pulse width and the mode-locked stability.
Zhang
Ruobing
R
School of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronic Information Technical Science, Chinese Ministry of Education, Tianjin University, Tianjin 300072, China. zhangrb@tju.edu.cn
Ma
Jing
J
Pang
Dongqing
D
Sun
Jinghua
J
Wang
Qingyue
Q