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Abstract

A method for remotely measuring an unknown temperature Ts of a transparent medium by comparison with the known temperature Tr of a transparent reference material consisting of the steps of combining the outputs of a continuous-wave (CW) laser and a high intensity pulsed laser to form a combined laser output beam, wherein the high intensity pulse component of the output beam exceeds the intensity required to produce stimulated Brillouin scattering (SBS) in the transparent medium; splitting the combined laser output beam into first and second sub-beams; amplifying the CW components of the first sub-beam to an intensity exceeding the intensity required to produce stimulated Brillouin scattering (SBS) in the reference material while simultaneously suppressing the pulse components in the first sub-beam; directing the first sub-beam with the amplified CW component into the reference material and thereby generating a CW phase-conjugate beam; directing the second sub-beam into the transparent medium and generating a pulsed phase-conjugate beam; mixing the CW and pulsed phase-conjugate beams in a photodetector and producing a difference frequency proportional to TS-Tr; and converting this difference frequency into a value of Ts.

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