Yuan Jinpeng, Liu Hao, Wang Lirong, Xiao Liantuan, Jia Suotang
Opt Express. 2021 Feb 15;29(4):4858-4865. doi: 10.1364/OE.416307.
We have generated a stable and continuously tunable single frequency (420 nm) coherent blue light (CBL) by the cavity-enhanced four-wave mixing process in Rb vapor. With the bow-tie-type ring cavity, the output power was 3.3 mW, two orders of magnitude higher than that of the CBL generated by the single-pass four-wave mixing process. The measured power stabilities of the 420 nm CBL operated at 2.5 mW and 1.5 mW for 1000 s were 2.89% and 1.88%, respectively. Under the scanning pump laser frequency, the continuously tunable range of the generated CBL reached 1.68 GHz without mode hopping. The measured beam qualities of the generated laser were 2=1.117 and 2=1.179. The excellent performance of the 420 nm CBL was characterized by velocity transfer spectroscopy with 780 nm probe laser. This high quality short wavelength coherent light is potentially applicable to photon-atom interactions in quantum optics and fundamental research fields.
我们通过铷蒸汽中的腔增强四波混频过程产生了一种稳定且连续可调谐的单频（420纳米）相干蓝光（CBL）。利用蝴蝶结型环形腔，输出功率为3.3毫瓦，比单通四波混频过程产生的CBL高出两个数量级。在2.5毫瓦和1.5毫瓦下运行1000秒时，测得的420纳米CBL的功率稳定性分别为2.89%和1.88%。在扫描泵浦激光频率时，所产生的CBL的连续可调谐范围达到1.68吉赫兹且无模式跳变。所产生激光的测量光束质量为M² = 1.117和M² = 1.179。利用780纳米探测激光通过速度转移光谱对420纳米CBL的优异性能进行了表征。这种高质量的短波长相干光在量子光学和基础研究领域潜在地适用于光子 - 原子相互作用。
