IR Window Studies
Abstract
This report describes progress on the first six months of effort on a program of infrared window studies. Studies related to thermal lensing include quantitative measurements of thermal lensing in CdTe, measurement of the three independent strain optic coefficients in CdTe and GaAs using an acousto-optic technique, and a theory of thermally induced birefringence in polycrystalline materials. Effort also focussed on defects in IR window materials, including a study of microscopic imperfections in CdTe and ZnSe in which the techniques of electron microscopy, infrared absorption spectroscopy and transport property measurements were brought to bear on samples prepared here for this purpose. The third area of study included measurements of laser damage characteristics of IR window materials at both 10.6 micrometers and in the 2-5 micrometers region. An effort to use surface acoustic waves to measure surface absorption was successfully completed during this period. A surface absorption as small as 0. 0001 could be directly measured in the presence of a large bulk absorption, 0. 0001/cm. Analyses of this work suggest that surface absorptions as low as 0. 00001 could be measured. This technology is being transferred to the China Lake Naval Weapons Center for refinement and extended use.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1976
- Accession Number
- ADA037009
Entities
People
- John H. Marburger
Organizations
- University of Southern California