Tuning and mode characteristics of the C.W. InSb spin-flip Raman laser determined by use of a Fabry-Perot interferometer

H. A. MacKenzie, S. D. Smith, R. B. Dennis

Research output: Contribution to journalArticle

Abstract

A simple variable length (10-50 cm) air-spaced Fabry-Perot interferometer has been used to calibrate the tuning characteristics of a c.w. InSb spin-flip Raman laser (SFRL). The SFRL output frequency is determined by competition between the spontaneous spin-flip resonance line and the cavity axial modes of the InSb crystal. Over several cavity modes the SRFL is found to tune linearly within ±250 MHz and inside a single mode to ±50 MHz. The tuning rate over several modes is found to be 2.35 cm-1/kgauss and within a single mode the tuning rate is 1.80 cm-1/kgauss. Frequency jumps of ˜500 MHz between modes are inferred. Used in conjunction with the observation of known molecular absorption lines as frequency standards, the interferometer provides a calibration of the SFRL suitable for infra-red Doppler limited spectroscopy. of gases. The observed frequency asymmetry in the SFRL output power and the non-linear tuning rate (variable from ˜70-40 MHz/gauss) over a single axial mode show plane-wave cavity theory to be inadequate. These effects can be explained by considering gain controlled refraction induced by a pump beam of gaussian profile. The near resonant dispersion of the refractive index of InSb is inferred from a measurement of the spacing between adjacent peaks in the SFRL output. © 1975.

Original languageEnglish
Pages (from-to)151-156
Number of pages6
JournalOptics Communications
Volume15
Issue number2
Publication statusPublished - Oct 1975

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