紧凑型LD端面抽运Nd:YAG内腔三倍频准连续355 nm紫外激光器

报道了一台LD端面抽运Nd:YAG晶体内腔三倍频355 nm激光高效率、高峰值功率准连续输出的全固态紫外激光器.激光腔采用紧凑型平平直腔，腔长仅106 mm.当注入抽运功率为5.73 W、重复频率为9 kHz时，获得163 mW的355 nm激光准连续输出，光光转换效率达到最高2.84％.当注入抽运功率为6.7 W重复频率为5 kHz时，获得最高174 mW的355 nm激光准连续输出，输出功率短期不稳定性为5％，光束质量因子M²为3.79.当注入抽运功率为5.73 W、重复频率为2 kHz时，获得112 mW的355 nm激光准连续输出，峰值功率最高达到9.15 kW.通过采用内腔倍频技术和设计合理的腔结构，实现了中小功率准连续输出的全固态紫外激光器的小型化、便携化，进一步拓宽了紫外激光器的应用领域. 关键词： LD端面抽运 内腔三倍频 Q')" href="#">声光调Q 紫外激光

Compact LD end-pumped Nd:YAG intracavity frequency-tripled quasi-continuous 355 nm laser

A diode-end-pumped Nd:YAG intracavity frequency-tripled quasi-continuous 355 nm laser has been demonstrated. The efficient third-harmonic generation with high peak power and stable operation is generated by a lithium triborate （LBO） crystal successfully. The laser cavity is a simple plane-to-plane linear cavity, which is short and compact. An average 355 nm laser output power of 163 mW is obtained at a pump power of 5.73 W and a pulse repetition rate of 9 kHz, with the highest optical-to-optical efficiency of 2.84%. The highest average 355 nm laser output power is up to 174 mW at a pump power of 6.7 W and a pulse repetition rate of 5 kHz. The instability of the output power of 174 mW is less than 5% and the beam quality M² factor is 3.79. An average 355 nm laser output power of 112 mW is achieved at a pump power of 5.73 W and a pulse repetition rate of 2 kHz and the peak power reaches the highest value of 9.15 kW. Compared with the technology of external cavity frequency conversion, the technology of intracavity frequency conversion can cut down some of the optical elements in the laser cavity, reduce the size of the laser, and enhance the handiness of the laser. These advantages will benefit the wide applications of the ultraviolet lasers.