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通过准相位匹配技术,采用1μm波段高功率窄谱线连续光纤激光放大器抽运高二次谐波转换效率周期性极化晶体,是实现高光束质量、小型化、高功率连续绿光激光器的一个非常有前途的方向。实验自主研发了高效率主振荡功率放大(MOPA)全光纤保偏放大模块,获得中心波长为1064.25nm,线宽为0.035nm的30 W连续线偏振激光,并以此作为基频光抽运国产周期极化钽酸锂(PPSLT)晶体进行了外腔单通倍频实验。保持PPSLT晶体的控制温度为145.6℃,在抽运光功率为21.5W时得到了2.1W的绿光输出。实验分析了温度、基频光功率密度和Boyd-Kleinman聚焦因子对倍频光转换效率的影响。实验过程中没有出现饱和现象,进一步提高抽运功率有望获得更高功率的绿光。
The quasi-phase matching technique uses a 1μm band high-power narrow-band continuous fiber laser amplifier to pump high-order second harmonic harmonic wave-making efficiency periodically polarized crystals, which is a very high quality, miniaturized and high power continuous green laser Promising direction. Experiments independently developed a high efficiency main oscillator power amplifier (MOPA) all optical fiber polarization maintaining amplifier module to obtain a 30 W continuous linearly polarized laser with a center wavelength of 1064.25 nm and a line width of 0.035 nm, and uses this as a base-frequency optical pumping domestically produced Periodic Polarization Lithium Tantalate (PPSLT) crystals were subjected to a one-pass external multiplier experiment. Maintaining the control temperature of the PPSLT crystal was 145.6 ° C, a green output of 2.1 W was obtained at a pump power of 21.5W. The effects of temperature, fundamental optical power density and Boyd-Kleinman focusing factor on the doubling frequency conversion efficiency were analyzed experimentally. No saturation phenomenon occurred during the experiment, and further increase of pumping power is expected to obtain higher power of green light.