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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 {μ}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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C. Kumar N. Patel (1972) studied this question.
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