Electrooptic gigahertz CO2 laser modulator

Details Electrooptic gigahertz CO2 laser modulator Electrooptic gigahertz CO2 laser modulator

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1131..168p&link_type=abstract

IN: Optical space communication; Proceedings of the Meeting, Paris, France, Apr. 24-26, 1989 (A90-38001 16-17). Bellingham, WA,

Physics

Optics

Carbon Dioxide Lasers, Electro-Optics, Optical Communication, Phase Modulation, Satellite Communication, Cadmium Tellurides, Electrical Properties, European Space Agency, Frequency Response, Optical Properties

Scientific paper

A space-qualifiable broadband electrooptic phase modulator for CO2 laser intersatellite communication (wavelength 10.6 microns) was developed. Eight Cad-Te crystals measuring 30 x 0.6 x 0.6 cu mm each were cascaded to yield a total active length of 240 mm. These crystals were embedded in a beryllia structure, designed to combine good heat transfer, high mechanical accuracy, and excellent electrical properties. Measured modulator characteristics are: optical transmittance above 80 percent, electrical bandwidth 2 GHz, maximum VSWR 1.75:1, modulation efficiency (at 20 W RF drive power) 1/8, modulation frequency response + or - 1 dB up to 1 GHz.

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