Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1103....2d&link_type=abstract
IN: Laser radar IV; Proceedings of the Meeting, Orlando, FL, Mar. 29, 30, 1989 (A90-33601 14-36). Bellingham, WA, Society of Pho
Physics
Carbon Dioxide Lasers, Gallium Arsenide Lasers, Laser Outputs, Microstrip Transmission Lines, Noise Measurement, Signal To Noise Ratios, Energy Conversion Efficiency, Mercury Cadmium Tellurides, Quantum Mechanics, Spatial Filtering, Traveling Wave Amplifiers, Waveguide Lasers
Scientific paper
Sidebands imposed on the output of a stable CO2 laser have been heterodyne mixed (on a 77K HgCdTe detector) with blackbody emission and alternately with radiation from a stable laser oscillator. The sidebands are generated upon passage of the beam from the laser through an electo-optic modulator consisting of a GaAs waveguide structure (prism coupled) which has been etched with a 1 mm wide microwave microstrip transmission cirucit, designed for use in the 12-18 GHz range, through which propagates the output from a traveling wave tube amplifier (TWTA). It has been found that the heterodyne signal-to-noise ratio (SNR) depends in large part on the quality of the TWTA, and only under a unique set of circumstances can the theoretical limit for the ideal SNR be approached.
Bunis Jenifer L.
Davidson Steven A.
Eng Richard S.
Parshall Elaine R.
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