| 摘要 |
The wavelength of an optical pump beam is down converted to a longer wavelength in a Raman active gaseous medium by stimulated Raman scattering. The Raman active gaseous medium is contained in the space between a pair of optical reflectors of an optical resonator of the type for producing a focus of the optical beam energy at a point intermediate the length of the resonator within the Raman active medium to enhance conversion of pump energy into the output longer wavelength of the Stokes wave. The pump beam is directed into the optical resonator at an angle to the optical axis of the optical resonator such that the optical beam path is folded back and forth within the optical resonator to cause the beam spot to walk over the surfaces of the reflectors and out of the optical resonator. The multipass Raman cell of the present invention is particularly useful for down converting pump wave energy in the infrared at relatively high power levels to Stokes wave infrared energy of longer wavelengths, such as at 16 microns, for producing a dissociation of molecules as may be employed for isotope separation.
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