The frequency of a commercial Ti:sapphire laser is stabilized directly relative to the Lamb-dip signal from an atomic vapor cell without the Fabry–Pérot cavity as in intermediate frequency reference. The laser spectrum is measured by means of a supercavity spectrum analyzer with a full width at half-maximum (FWHM) of 110 kHz, which is independently calibrated using a ring-down technique. The measured spectrum has a FWHM of 220 kHz, thus indicating the laser linewidth to be about 55 kHz RMS.
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An et al. (1995) studied this question.
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