Optics Heterodyne Detection of the Autoionization State of Barium
SUN Jiang1,SU Hong-xin1,WANG Yan-bang2,GUO Qing-lin1,ZUO Zhan-chun2,FU Pan-ming2
1. Physical Science & Technology College, Hebei University, Baoding 071002, China 2. Laboratory of Optical Physics, Insitute of Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract：The autoionization state of barium was observed by optics heterodyne between three-photon resonant nondegenerated six-wave mixing (NSWM) and two-photon resonant nondegenerated four-wave mixing (NFWM). In this way，optics heterodyne spectrum of 6p3/219d autoionization state of barium was measured. The suppression and enhancement of the NFWM signal was observed which was caused by the quantum interference between NFWM and NSWM. Our method is a pure nonlinear optic technique. It has the advantages of excellent spatial signal resolution and simple optical alignment. Here two-photon resonant NFWM is used as local oscillation, while three-photon resonant NSWM signal is used as signal beam. Detection of autoionization states of Ba was achieved by changing the frequency of signal beam. The phase matching condition of this technique is not so stringent and can be achieved over a very wide frequency range, which is very difficult in the general six-wave mixing. Furthermore, the signal is coherent light. Optics heterodyne spectrum is a Doppler- free spectroscopy when the incident lasers have narrow bandwidths.
孙江1,苏红新1,王延帮2,郭庆林1,左战春2,傅盘铭2. 光学外差法测量Ba原子的自电离态[J]. 光谱学与光谱分析, 2008, 28(06): 1213-1217.
SUN Jiang1,SU Hong-xin1,WANG Yan-bang2,GUO Qing-lin1,ZUO Zhan-chun2,FU Pan-ming2. Optics Heterodyne Detection of the Autoionization State of Barium . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(06): 1213-1217.
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