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我们在实验中演示了520nm单频绿光泵浦的基于周期极化磷酸钛氧钾(PPKTP)晶体的780nm+1560nm双共振光参量振荡器,高效制备780nm+1 560nm连续可调谐双色下转换光场。该参量振荡器可输出93.3 mW的1 560nm单频激光和44.6mW的780nm单频激光。通过改变PPKTP晶体的温度所得到的波长粗调范围为:信号光1 529.81nm~1 573.83nm(~44nm),闲置光788.26nm~777.20nm(~11nm);通过连续调谐520nm泵浦激光频率初步得到的闲置光在780.24nm(铷原子D2线)处频率连续调谐范围约1.6GHz。
In the experiment, we demonstrated a 780 nm + 1560 nm dual-resonance optical parametric oscillator based on a periodically poled potassium titanyl oxide (PPKTP) crystal of 520 nm monochromatic green-pump and efficiently fabricated 780 nm + 1 560 nm continuously tunable two-color downconversion field. The parametric oscillator outputs 93.5 mW of 1 560 nm single-frequency laser and 44.6 mW of 780 nm single-frequency laser. By adjusting the temperature of the PPKTP crystal, the coarse wavelength range of the signal is from 1 529.81 nm to 1 573.83 nm (~ 44 nm) and the idle light from 788.26 nm to 777.20 nm (~ 11 nm). By continuously tuning the pump laser wavelength at 520 nm, The resulting idle light has a continuous frequency tuning range of about 1.6 GHz at 780.24 nm (rubidium atom D2 line).