Conversion Efficiency, Spectral 7 Mode Purities of a Single Sideband Electro-Optic Modulator

摘要

The measured single sideband conversion efficiency of a 10.6 micron bulk-type CdTe electro-optic modulator over the 14-18 GHz modulation frequency range is shown to be in close agreement with the coupled-mode and segmented modulator theories. The paper addresses the effects of the rotational orientations of segmented crystals and indirectly proves that a broadband multisection modulator is feasible; it further shows that a modulator with crystals in rotatable segmented circular waveguides is spectrally widely tunable. The effects of mechanical pressure and off-axis beam propagation on conversion, mode purity, and beam quality are also discussed. Reprints. (rh)