A high-repetition-rate,266 nm picosecond ultraviolet(UV) laser output based on β-BaB2O4(BBO) is reported.The source based on fourth harmonic generation(FHG) of a 1064 nm compact Yb-fiber laser.Using a two-crystal spatial walk-off compensation scheme,average output power of 2.9 W is gotten when pulse repetition rate is 80 MHz,and FHG efficiency of 35% from the green to UV is obtained.The dynamic color center formation due to two-photon absorption in BBO is investigated by the change of light intensity at 266 nm,and the rule of two-photon absorption coefficients and the color center densities with crystal temperature change is obtained.The experimental results show that the two-photon absorption coefficient in BBO at 266 nm is 3.5 times lower at 200 ℃ compared to that at room temperature,which improves the output power and stability of ultraviolet laser at 266 nm.
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卢一鑫,杨森林,赵小霞,张变莲.基于偏硼酸钡晶体高重复频率266 nm紫外激光器[J].激光与红外,2017,47(9):1113~1118 LU Yi-xin, YANG Sen-lin, ZHAO Xiao-xia, ZHANG Bian-lian. High-repetition-rate 266nm ultraviolet laser based on β-BaB2O4 crystal[J]. LASER & INFRARED,2017,47(9):1113~1118