Title :
Oblique-cut longitudinal electrooptic modulators
Author :
Hulme, Kenneth F.
Author_Institution :
Royal Radar Estalishment, Malvern, Worcestershire, England
fDate :
6/1/1971 12:00:00 AM
Abstract :
The minimum longitudinal half-wave voltages are calculated for five oxygen-octahedral crystals with large linear electrooptic coefficients. The predicted values range from 11 kV (LiTaO3) to 75 V (BaTiO3). Experimental results have been obtained for LiNbO3and LiTaO3. The minima occur in directions with finite birefringence; the resulting limitations in angular aperture and temperture sensitivity are considered, and a compensation scheme to off-set them is discussed. The limiting operating frequency for uncompensated modulators can stem from joule heating in the transparent electrodes. The effect is evaluated and a figure of merit is derived. The values are surprisingly similar for the five crystals considered.
Keywords :
Apertures; Birefringence; Crystals; Electrooptic effects; Electrooptic modulators; Frequency; Lithium niobate; Optical propagation; Optical sensors; Voltage;
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.1971.1076770