Yang Baodong, Xu Jing, Fan Jian, Zhou Haitao
Opt Lett. 2024 Jul 15;49(14):3846-3849. doi: 10.1364/OL.525940.
The frequency evaluation of collimated blue light (CBL) generated by parametric four-wave mixing (FWM) in hot atomic vapor is presented. The cesium (Cs) atoms are excited from the 6S ground state to 8S excited state with the 852 and 795 nm pump lasers, producing an optical field at 4.2 µm through an amplified spontaneous emission via population inversion on the 8S→ 7P transition and the 456 nm CBL via FWM on the 7P→ 6S transition. The frequency shift of 456 nm CBL has been measured by velocity-selective optical pumping spectral technique when the frequency of any one of two pumping lasers is tuned. The ratio of the frequency shift of 456 nm CBL to the two-photon frequency detuning of two pumping lasers is 0.8912, implying that the generated 4.2 µm light frequency is also correspondingly shifted.
本文介绍了通过热原子蒸汽中的参量四波混频（FWM）产生的准直蓝光（CBL）的频率评估。利用852和795 nm泵浦激光器将铯（Cs）原子从6S基态激发到8S激发态，通过8S→7P跃迁上的粒子数反转产生放大自发辐射，从而在4.2 µm处产生光场，并通过7P→6S跃迁上的FWM产生456 nm的CBL。当两个泵浦激光器中的任何一个的频率调谐时，已通过速度选择光抽运光谱技术测量了456 nm CBL的频移。456 nm CBL的频移与两个泵浦激光器的双光子频率失谐之比为0.8912，这意味着所产生的4.2 µm光频率也相应地发生了偏移。
