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Physical Review Letters

Linewidth of Tunable Stimulated Raman Scattering

C. Kumar N. Patel

Published Mar 13, 1972• 66 citations
Publisher

Abstract

We report direct measurements of the tunable spin-flip Raman (SFR) laser linewidth, obtained by heterodyning the SFR laser output with the output from a cw gas laser. The measured linewidth for the cw SFR laser operating near 5.3 \ensuremath{\mu}m is 1 kHz and is limited by the spectrum analyzer resolution. The measured linewidth of 1 kHz is the narrowest known for any tunable source of coherent radiation in the infrared.

DOI
10.1103/physrevlett.28.649

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We report direct measurements of the tunable spin-flip Raman (SFR) laser linewidth, obtained by heterodyning the SFR laser output with the output from a cw gas laser. The measured linewidth for the cw SFR laser operating near 5.3 \ensuremath{\mu}m is 1 kHz and is limited by the spectrum analyzer resolution. The measured linewidth of 1 kHz is the narrowest known for any tunable source of coherent radiation in the infrared.
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The spectrum of the stimulated electronic Raman gain at 650 nm in Ne I, pumped by a 633-nm He-Ne cw laser in the same cavity, is derived. The question of the proper Raman-gain linewidth is addressed. It is shown that the gain has a nearly Doppler-free component whose width is measured as 30 +/- 10 MHz (FWHM) at 6 Torr. This value agrees reasonably well with the residual Doppler broadening but not with collisional broadening rates. A simple calculation is included that shows the quantum-limited frequency uncertainty of the 650-nm laser to be higher by a factor of 1.5 than the frequency uncertainty of the 633-nm laser at equal power.