Interference problems in a coherent aberration sensor
Abstract
Interference problems in fast IR wave-front coherent aberration sensors used in high-energy laser technology are discussed. In a test a delta S signal was plotted as a function of beam input tilt. The aberration sensor used in the test was a knife-edge (KE) scanner. It is shown that a detector window and/or filter can be the cause of the problem. Confirmation was obtained by removing the window and filter. Methods for solving the problem are suggested, including a wedged filter. The window and chip surfaces can also be tilted several degrees with respect to each other to avoid possible mutual interference effects.
- Publication:
-
Applied Optics
- Pub Date:
- August 1979
- DOI:
- 10.1364/AO.18.002891
- Bibcode:
- 1979ApOpt..18.2891G
- Keywords:
-
- High Power Lasers;
- Infrared Scanners;
- Technology Assessment;
- Wave Front Deformation;
- Chips (Electronics);
- Graphs (Charts);
- Infrared Radiation;
- Pyroelectricity;
- Instrumentation and Photography;
- ABERRATIONS;
- INTERFERENCE;
- COHERENCE;
- DETECTORS