Collimated UV light generation by two-photon excitation to a Rydberg state in Rb vapor

被引：21
|
作者：
Lam, Mark [1 ]
Pal, Sambit B. [1 ]
Vogt, Thibault [1 ,2 ]
Gross, Christian [1 ]
Kiffner, Martin [1 ,3 ]
Li, Wenhui [1 ,4 ]
机构：
[1] Natl Univ Singapore, Ctr Quantum Technol, 3 Sci Dr 2, Singapore 117543, Singapore
[2] CNRS UNS NUS NTU Int Joint Res Unit UMI 3654, MajuLab, Singapore 117543, Singapore
[3] Univ Oxford, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England
[4] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore
来源：
OPTICS LETTERS | 2019年 / 44卷 / 11期
基金：
新加坡国家研究基金会;
关键词：
FREQUENCY-UP-CONVERSION; LASER-BEAM; COHERENT; INVERSION; BLUE;
D O I：
10.1364/OL.44.002931
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We use two continuous-wave laser beams of 780 nm and 515 nm to optically drive Rb-85 atoms in a heated vapor cell to a low-lying Rydberg state 10D(5/2). We observe a collimated ultraviolet (UV) beam at 311 nm, corresponding to the transition frequency from the 11P(3/2) state to the 5S(1/2) state. This indicates the presence of a coherent four-wave mixing process, built up by two input laser fields as well as terahertz (THz) radiation of 3.28 THz, which is generated by amplified spontaneous emission between the 10D(5/2) and 11P(3/2) states. We characterize the 311 nm UV light generation and its dependence on various physical parameters. This scheme could open up a new possibility for generating narrow-band THz waves as well as deep UV radiation. (C) 2019 Optical Society of America
引用
收藏
页码：2931 / 2934
页数：4
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