NASA NTRS · 19660059823
Proposed backward wave oscillation in the infrared.
Abstract
Birefringence of certain crystals sufficiently large to allow collinear backward wave interaction of three electromagnetic waves with signal frequency tunable over large portion of IR SPECTRUM
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Harris, S. E.. 1966-08-01. Proposed backward wave oscillation in the infrared.. https://ntrs.nasa.gov/citations/19660059823
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