紧凑的新型Yb∶GdYAB自倍频激光器

A Novel Microchip Self-Double-Frequency Laser

报道了一种新型自倍频晶体Yb∶Gd0.2Y0.75(BO3)4(Yb∶GdYAB)在二极管激光器端面抽运条件下的连续光激光运转。为了实现紧凑的新型全固态激光器的激光运转,设计了一个平平谐振腔,两个镜子的分开距离仅为1 cm,在这种腔结构下,得到了中心波长为1044 nm的基频激光输出,当吸收抽运功率为4.22 W时,基频激光的最大输出功率为1.38 W,相应功率曲线最大斜效率为54%。为获得有效的自倍频激光输出,换用了平凹腔进行了自倍频实验。自倍频光运转阈值仅为900 mW,在吸收抽运功率为3.9 W的条件下,得到144 mW的自倍频绿色激光输出,获得从二极管激光器到绿光的直接光-光转换效率为3.7%。实验结果表明Yb∶GdYAB作为一种新型的自倍频晶体,对于紧凑的1μm波段的基频光和自倍频可见光激光器都有着很大的应用潜力。

The continuum-wave laser operation of a new self-frequency-doubled Yb： Gd0.2Y0.75（BO3）4 （Yb： GdYAB） crystal under high-power diode-end-pumping was reported, To achieve compact all-solid-state laser＇s operation, a plane-parallel cavity was employed with two mirrors separated by 1 cm, and obtained the fundamental-wave laser with central wavelength at 1044 nm, The maximal output power of 1.38 W was obtained with an absorbed power of 4.22 W, which corresponded to slope efficiency of 54%. A piano-concave cavity was used to obtain efficient selffrequency-doubled （SFD） generation. Self-frequency-doubled green laser with a center wavelength of 522 nm was also obtained, and the threshold absorbed pump power was only 900 mW. The maximal output power was 144 mW when pumped power was 3.9 W. A diode-to-green optical conversion efficiency of 3.7 % was achieved. The results indicate that the Yb：GdYAB crystal is of great potential in applications of both 1 ~m fundamental wave and selffrequency-doubled visible light lasers.