Coherence effects in a multiply pumped spin-flip Raman laser

S.Y Yuen, Benjamin Lax, Peter A. Wolff

W. J. Firth

C. Kumar N. Patel

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.

V. T. Nguyen, E. G. Burkhardt

We have succeeded in generating cw laser sidebands at wavelengths tunable from ∼5.5 to ∼6.5 μm. The behavior of the power output of the generated radiation is described quantitatively by using the equivalence between four-photon mixing and Raman scattering from coherent spin motion in a spin-flip Raman laser.

Robert L. Allwood, Richard B. Dennis, R. Mellish +3 more

The authors report the observation of stimulated Stokes scattering of 5.3 mu m pump radiation by spin flip excitations in InSb, using a 10.6 mu m CO 2 laser, together with a tellurium frequency doubler, as the 5.3 mu m source. The effects of resonant enhancement on the 5.3 mu m scattering are discussed and comparison made with 10.6 mu m results. The observation of atmospheric water vapour absorption lines near 5.5 mu m demonstrates the application of the spin flip source to high resolution spectroscopy.

Carl O. Weiss, A. Godone