New Materials for Infrared Transmitting Electrooptic Filters
Abstract
The objectives of this program are to find and develop new IR transmitting materials and to provide new data ont he electrooptic (EO) properties of those most likely to have an EO coefficient an order to magnitude higher than materials currently in development for tunable filters. The main technical problems anticipated include the synthesis and single-crystal growth of these materials: many are poorly characterized and others have high melting points or melt incongruently. Our approach will overcome these obstacles by first synthesizing 20 polycrystalline samples; subsequently, dielectric constants at low and ambient temperatures will be determined and the two best materials of the survey will be grown as single crystals (second year of the program). During the last quarter, GeS2 was grown as small single-crystal sample, and evaluated. Over the range 5 kHz to 100 kHz, the dielectric constant shows little variation: 10.73 at 5 kHz, 10.52 at 100 kHz. Far infrared spectroscopy measurements in regions where the dielectric constant epsilon is essentially equal to the square of the refractive index, epsilon = n sq., are in generally good agreement with the above measurements, taking into account some of the features of the curve of epsilon as a function of frequency.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1978
- Accession Number
- ADA139272
Entities
People
- A. L. Gentile
Organizations
- HRL Laboratories