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9 January 2002 CO2 laser wavelength shifter
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The CO2 laser is well suited for detecting a number of chemicals in the 9.3 - 10.7 micrometers band. However, there are several important species that require emission at 8 - 8.5 micrometers , which is not available from this laser. This has led to the development of a CO2 wavelength shifting technique that allows for interrogation of the 8 micrometers region. A two-stage process using the non-linear crystal AgGaSe2 accomplishes the shifting. In the first stage, the 10.6 micrometers CO2 laser pump is doubled to 5.3 micrometers by second harmonic generation which then pumps the second stage, shifting the wavelength to 8.3 micrometers by optical parametric oscillation. Energy conversion efficiencies of 40 percent have been obtained for the first stage shift and 10 percent in the second stage.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael E. Ehritz, David B. Cohn, and Cynthia R. Swim "CO2 laser wavelength shifter", Proc. SPIE 4484, Lidar Remote Sensing for Industry and Environment Monitoring II, (9 January 2002);

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