Two methods for polarization stabilization of an internal-mirror 3.39-μm He–Ne laser are reported. The first relies on a concurrently lasing 1.15-μm transition by fixing the relative amplitude of two orthogonally polarized longitudinal modes that are split by a Rochon prism and detected with separate Si photodiodes. In the second method, two spatially separated orthogonally polarized adjacent 3.39-μm modes are optically balanced, differentially chopped, and recombined on a single InSb photodiode for phase-sensitive detection. The dual-wavelength scheme has been tested by beating against a methane-stabilized 3.39-μm He–Ne laser, which yields maximum excursions of < 0.5 MHz over several hours and comparable reproducibility. The polarization-stabilized He–Ne laser has been used as a reference for a tunable color-center laser molecular-beam optothermal spectrometer and provides a precision of better than 2 MHz.
© 1992 Optical Society of AmericaFull Article | PDF Article
Ch. Salomon, D. Hils, and J. L. Hall
J. Opt. Soc. Am. B 5(8) 1576-1587 (1988)
W. J. Tomlinson and R. L. Fork
Appl. Opt. 8(1) 121-129 (1969)
W. G. Schweitzer, E. G. Kessler, R. D. Deslattes, H. P. Layer, and J. R. Whetstone
Appl. Opt. 12(12) 2927-2938 (1973)