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通过内置周期极化磷酸氧钛钾晶体的半整块谐振腔,采用铯原子D2线的抽运光实现了426nm的蓝光倍频输出。实验采用了相对松散的聚焦,明显改善了基频光和倍频光吸收诱发的热效应。采用305 mW的模式匹配基频光,获得了117.2mW的倍频蓝光,倍频过程中最高光-光转化效率达到42%;84.5mW蓝光在约1h内的功率起伏为0.48%。结果表明,所提方法可实现倍频光的稳定输出,在量子光学、光与物质相互作用等领域具有广阔的应用前景。
Through the built-in semi-monolithic resonant cavity with periodically poled potassium titanyl phosphate crystal, the pump light of cesium D2 line is used to realize the 426nm blue-octave frequency doubling output. The experiment used a relatively loose focus, which significantly improved the thermal effects induced by the fundamental frequency and frequency doubling light absorption. With 305 mW mode-matched fundamental frequency light, a frequency-doubled blue light of 117.2 mW was obtained with a maximum light-to-light conversion efficiency of 42% during the doubling frequency; and a power fluctuation of 0.48% for the 84.5 mW blue light in about 1 h. The results show that the proposed method can achieve the stable output of frequency doubling light and has broad application prospect in the fields of quantum optics, light and matter interaction.