Microwave Waveguide Modulators for CO2 Lasers
Semi-annual technical rept. no.5, 25 Sep 1974-25 Mar 1975
UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CT
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The long-range objective of this program is to develop an efficient and reliable ultra-wideband waveguide modulator for CO2 lasers that will be useful for high resolution, imaging optical radars and high-data-rate optical communication systems. During this reporting period three significant advances have been made in the modulator development. The first development involves improvements in the quality of the GaAs waveguide structure and the reliability of producing thinfilm waveguides with acceptable quality the second development, involves improvements in optical coupling efficiency and the last development involves improvements in the reproducibility of the microwave characteristics of the waveguide modulator. With the exception of the growth of the bulk GaAs crystals, which are currently purchased from two different vendors, the complete material processing and waveguide synthesis are being carried out at our laboratory under controlled procedures. Waveguide structures with lengths in excess of 2 cm, which include two 3 mm x 3 mm grating couplers at the ends can now be reliably made with any desirable average thickness.
- Lasers and Masers