全固态腔内和频单纵模593.5nm黄光激光器

All Solid-State Intracavity Sum-Frequency Single-Longitudinal-Mode 593.5nm Yellow Lasers

设计了一种结构紧凑、性能稳定、成本低的腔内和频单纵模593.5 nm黄光激光器。采用线性平凹腔结构,LD端面泵浦Nd:YVO4晶体产生1064 nm和1342 nm双波长激光束;通过KTP(KTiOPO4)Ⅱ类临界相位匹配在腔内和频产生593.5 nm连续黄光激光输出。利用由单个布氏片(BP)与和频晶体KTP构成的双折射滤波片进行选频,在泵浦功率为5.0 W时,593.5 nm和频光单纵模输出功率为30 mW,方均根噪声为0.8%,线宽为150 MHz。此时,检测到1064 nm和1342 nm基频光均为单纵模状态。实验结果表明,在和频激光器中,利用双折射滤波片技术使得基频光次振荡纵模损耗≥1.5%,即可以实现单纵模和频激光输出。

Herein, an intracavity single-longitudinal-mode 593.5 nm yellow lasers with compact structure, stable performance, and low cost is designed. A laser diode end-pumped Nd:YVO4 crystal is used to produce 1064 nm and 1342 nm dual-wavelength laser beams with a linear flat-cavity structure. The intracavity sum-frequency mixing of the 593.5 nm continuous yellow laser output is achieved via KTP Ⅱ-type critical phase matching. The Brewster plate(BP) and sum-frequency crystal KTP are used as a birefringent filter for frequency selection. When the pump power is 5.0 W, the single-longitudinal-mode output power at 593.5 nm is 30 mW, root-mean-square noise is 0.8%, and line width is 150 MHz. For this condition, the fundamental light at 1064 and 1342 nm is detected to be in the single-longitudinal-mode state. Experimental results show that the single-longitudinal-mode sum-frequency laser is achieved using the birefringent filter technique for a loss of more than 1.5% for the adjacent fundamental mode.