Photothermal Common Path Interferometer for High Power Laser Optical Coating Characterization
Abstract
The requested instrumentation is a Photothermal Common Path Interferometer (PCI) that will beused to measure the absorption of multilayer dielectric coatings employed for high power laserweapon systems. PCI is based on a pump/probe technique in which a low power" probe beamsenses the heating effect on an absorbed pump beam. The high power, smaller diameter, pumpbeam is chopped to modulate t""he heating effect at a predetermined frequency, which distorts theprobe beam profile in the central area. This results in a change" in the beam profile fromGaussian due to interference of the distorted and undistorted parts of the probe beam. The setupis illustrated in Figure 1.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 29, 2017
- Source ID
- N000141712854
Entities
People
- Jeffery Thomas
Organizations
- Office of Naval Research
- Pennsylvania State University
- United States Navy