THE IMPORTANCE OF LASER TUNING CHARACTERISTICS FOR APPLICATION TO AIR POLLUTION DETECTION
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Date
1972
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Ohio State University
Abstract
The successful application of semiconductor lasers to gaseous infrared analysis requires an exact match between laser output and gas absorption frequencies. Obtaining such a match requires detailed knowledge of the parameters which determine the operating frequency of the laser. In $Pb_{1-x}Sn_{x}Te$ diode lasers formed by impurity diffusion, both the energy gap and index of refraction show the expected temperature dependence to first order, but cavity mode effects are interrelated and have caused appreciable frequency shifts. Furthermore, slight differences in the operating conditions of different dewars have also produced frequency changes. We have studied these factors and allowed for them in using lasers under different experimental conditions. As examples of the frequency match obtained, spectra of $SO_{2}$ and $NH_{3}$ are presented.
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Author Institution: General Motors Research Laboratories; Texas Instruments, Inc.