高效高功率侧面抽运腔内倍频连续绿光激光器

激光二极管(LD)侧面抽运的内腔倍频激光器技术是实现高功率、高稳定且低成本连续绿光激光器的有效方法。为满足激光彩色显示、激光加工、数据存储、医疗卫生和科研等领域对连续绿光激光器的需求,研制了一台高效、高功率侧面抽运腔内倍频Nd∶YAG/KTP连续绿光激光器。采用优化的平-凹-平三镜折叠腔结构,Ⅱ类相位匹配KTP晶体内腔倍频,当808 nm激光二极管抽运功率约为180 W时,得到最高18.7 W的连续绿光激光输出,对应的光-光转换效率为10.4%。在输出功率15.4 W时测量激光功率稳定性,其功率不稳定度小于0.5%。输出光束平滑,远场为类高斯分布,用刀口法测量了激光器不同输出功率时的光束质量,光束传输因子M2小于7。

Efficient High Power Diode-Side-Pumped Intracavity-Doubled Continuous Wave Green Laser

Laser diode (LD) side-pumping and intracavity-doubling technology is an available method to achieve high power, high stability and low cost continuous wave (CW) green laser. To meet the demand in the fields of laser color display, laser processing, optical data storage, laser medical and scientific research, an efficient high power diode-side-pumped intracavity-doubled CW green Nd:YAG/KTP laser has been developed successfully. By using plane-concave-plane resonator of three mirrors, and KTP of Ⅱ-type phase-matching for frequency doubling, a maximum of 18.7 W CW 532 nm green laser is obtained when the 808 nm pump laser power is 180 W, and the optical-to-optical conversion efficiency is 10.4%. The power stability of the laser is measured at output power of 15.4 W. During an hour measurement time, the output power instability is less than 0.5%. The output beam exhibits a smooth Gaussian-like profile in the far field and the beam transfer factor is measured to be less than 7 measured by knife-edge method at different output power.