LD泵浦Nd:YAG人眼安全波段1.44μm激光器

LD-pumped eye-safe Nd:YAG laser at 1.44μm

利用808 nm LD作泵浦源,通过合理的谐振腔镜膜层设计,实现了Nd:YAG的4F3/2→I13/2能级跃迁,获得了1.44μm人眼安全波段激光的连续和脉冲运转。在泵浦功率为1.5 W的条件下,激光器连续运转时,腔内放入布氏片,获得268 mW的稳定TEM00模线偏振激光输出,激光阈值380 mW,斜效率达23.9%,M2因子小于1.3。用新型饱和吸收体V:YAG代替布氏片垂直于光路放置,获得了平均输出功率36 mW,脉冲宽度106 ns,脉冲重复频率52 kHz仍然是线偏振的激光输出,相应脉冲峰值功率和单脉冲能量分别为6.5 W和0.69μJ。

A laser in eye-safe spectrum region at 1.44 μm was demonstrated by using LD- pumped Nd：YAG. The ^4F3/2 →^4I13/2 transition of Nd：YAG was realized by reasonable coating on the mirrors of the resonator. The CW and pulse operation switched by a new type of saturable absorber V：YAG were realized, respectively. When the incident pump power was 1.5 W, CW linear polarization output power of 268 mW was obtained with Brewster plate acting as polarizer in the cavity. The threshold was 380 mW and the slope-efficiency was 23.9%. Beam quality factor M^2 was less than 1.3. When V：YAG was inserted into the resonator instead of the Brewster plate with 0° incident angle, linear polarization laser was also demonstrated. The results of average power of 36 mW, pulse duration of 106 ns and pulse repetition rate of 52 kHz were obtained. The corresponding peak power and single pulse energy was 6.5 W and 0.69μJ, respectively.