High gain laser spectrometer

Details High gain laser spectrometer High gain laser spectrometer

1978-04-17

1979-12-04

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

356327, 356408, 356425, G01J 342, G01N 2104

Patent

active

041769597

ABSTRACT:
A spectrometer for measuring the spectra and concentration of airborne chemicals at long ranges wherein the optical signals may be occluded by dust. A single lasing medium is utilized both for producing a transmitted optical signal and for amplifying a received optical signal, the frequencies of radiation of the transmitted and received optical signals being offset as the radiation propagates to a distant reflector and back to the lasing medium. The frequency offset is obtained by sweeping the transmitted frequency at a rate commensurate with the round trip propagation time whereby the offset is sufficient to place the received frequency at a peak at the amplifying spectrum of the lasing medium. A laser containing the laser medium further incorporates an interferometric structure within the optical path for sequentially shifting the frequency of oscillation to produce a comb spectrum for sampling the spectra of the chemicals to provide identifying signatures thereof.

REFERENCES:
patent: 3805074 (1974-04-01), McCormack
patent: 3843258 (1974-10-01), Shupe
patent: 3856406 (1974-12-01), Noble et al.
patent: 3950100 (1976-04-01), Keene et al.
patent: 4012145 (1977-03-01), Chabannes et al.

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