Doppler-free optical double-resonance Stark spectroscopy using modulation sidebands

Brian J. Orr*, Takeshi Oka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


An electro-optic modulator, driven at a single radio frequency ν, is used to create sidebands (νL±ν) on the frequency νL of a cw single-mode CO2 laser. Laser-induced line narrowing in molecular Stark spectroscopy is demonstrated, using double resonances of the copropagating waves at νL and (νL±ν) with pairs of coupled Doppler-broadened transitions. Doppler-free Stark spectra of the molecules PH3, 13CH3F, and 12CH3F are used to illustrate the technique. For PH3 it is found that the electric dipole moment vibrational difference ∥μ (v2=1)-μ (v=0) ∥≤0.005 D.

Original languageEnglish
Pages (from-to)468-470
Number of pages3
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 1977
Externally publishedYes


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