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The external-resonator cw spin-flip Raman laser; output characteristics and spectroscopic applications

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Abstract

The characteristics of a stable, external-resonator spin-flip Raman laser (SFRL), pumped by a cw carbon monoxide laser of controlled mode quality and spectral content, are determined using a combination of molecular spectroscopy, Raman amplifier and confocal Fabry-Perot interferometer measurements, and heterodyne detection.

Single-frequency output of a free-running external-resonator is demonstrated with an inherent linewidth of <10 kHz and a short-term frequency jitter of ≃100 kHz. With the resonator length actively controlled to lock an axial mode frequency to the peak of the spontaneous gain, the linewidth of the SFRL output was maintained below 2 MHz.

In this mode of operation, small variations in the output tuning rate, corresponding to the magnetic field dependence of the conduction-electrong-factor, were calibrated.

Molecular absorption spectra obtained using gas cells both inside and outside the resonator have been used to illustrate the high resolution, wide-range tuning capability and sensitivity of the system. Lambda-doubling of the\(^2 \pi _{3/2} \) of the Q-branch head of nitric oxide was measured for values ofJ down to 13/2, below which the splitting is less than the Doppler width. The splittings agreed with predictions using parameters obtained by conventional spectra for higherJ-values.

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Mozolowski, M.H., Dennis, R.B. & Mac Kenzie, H.A. The external-resonator cw spin-flip Raman laser; output characteristics and spectroscopic applications. Appl. Phys. 19, 205–212 (1979). https://doi.org/10.1007/BF00932399

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