摘要
本文从密度矩阵运动方程出发,研究了经位相调制的光束和未经调制的光束同时与串联式三能级系统相互作用的过程,并计算了基于近简并四波混频过程的光外差调制转移光谱讯号的线型。计算结果表明它能有效地克服中间能级近共振所产生的多普勒背景,并有效地区分单光子饱和吸收讯号和双光子跃迁讯号。
Based on density matrix equations, we studied the interaction process among phase-modula-ted beams, unmodulated beam and a cascade three-level system. Calculations of the line shape of optical heterodyne modulation transfer spectroscopy via nearly-degenerate four-wave mixing were made. The results show that the Doppler background due to the near resonance of the in-termediate level is eliminated and the signal of two-photon transition can be distinguished from saturation absorption.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第4期582-591,共10页
Acta Physica Sinica
基金
国家自然科学基金
关键词
光谱分析
调制转移光谱
线型
Calculations
Heterodyning
Modulation
Photons
