Narrow line width quasi-continuous-wave yellow laser by optical parametric oscillator
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摘要: 利用输出532 nm波长的全固态准连续Nd:YAG激光器作为泵浦源，对以KTP晶体为非线性晶体的窄线宽光学参量振荡器输出特性进行研究。在谐振腔内插入石英标准具压缩输出激光线宽。通过理论分析,估算了脉冲光学参量振荡器谐振腔内标准具对闲频光的透射光谱线宽，根据计算结果设计了实验用的标准具参数。在光学参量振荡器谐振腔内插入另一KTP晶体对闲频光进行腔内倍频，实现了波长调谐范围574.5～577.2 nm的pm级窄线宽可调谐黄光输出。在重复频率为10 kHz，泵浦光平均功率为30 W时，倍频黄光的峰值波长为575.81 nm，对应的平均输出功率为155 mW，脉宽约为35 ns，线宽仅为0.8 pm，x和y方向光束质量因子则分别为1.286和1.807。Abstract: The output characteristics of a narrow line width optical parametric oscillator with KTP as the nonlinear crystal which pumped by a 532 nm wavelength all-solid-state quasi-continuous-wave Nd:YAG laser are studied. A quartz etalon is inserted into the resonant cavity to compress the output laser line width. Through theoretical analysis, the transmission spectra line width of the etalon for the idler wave within the pulsed optical parametric oscillator’s resonant cavity is estimated. Based on the calculation results, the parameters of the etalon for experimental use are designed.By inserting another KTP crystal into the optical parametric oscillator resonant cavity to perform intracavity frequency doubling on the idler, a tunable yellow laser output with a wavelength tuning range of 574.5-577.2 nm and a pm-level line width is achieved. At a repetition rate of 10 kHz and an average pump power of 30 W, the peak wavelength of the frequency doubled yellow light is at 575.81 nm, with a corresponding average output power of 155 mW and a pulse width of 35 ns. The line width at the peak wavelength is only 0.8 pm. Beam quality factor in the x and y direction is measured respectively as 1.286 and 1.807.
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Key words:
- solid-state laser /
- optical parametric oscillator /
- quasi-continuous-wave /
- narrow line width /
- yellow laser /
- etalon
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图 1 OPO泵浦激光波长和线宽的波形图
Figure 1. The wavelength waveform and the line width waveform of pump laser for OPO
图 4 OPO腔内闲频光在子午面和弧矢面的光斑半径分布
Figure 4. Beam radius of idler wave in the OPO cavity for meridional ray and sagittal ray
图 5 腔内标准具中心波长
1153 nm处的透射率曲线Figure 5. Transmittance curve of etalon in resonant cavity at center wavelength
1153 nm
图 6 闲频光波长与线宽的波形图
Figure 6. The wavelength waveform and the linewidth waveform of the idler wave
图 7 OPO倍频实验装置实物图与黄光输出参数
Figure 7. Photo of OPO frequency doubling experimental device and the yellow laser output
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