New demodulation scheme for laser-scanned acoustical-imaging systems
Abstract
Several acoustooptical imaging systems are described in the literature where the image information is obtained by scanning a focused beam over a flexible mirror located at the acoustical image plane. The small dynamic deformation of the mirror induces a shallow phase modulation in the scanning beam. This paper describes a time-delay filter that transforms the phase-modulated beam into an amplitude-modulated beam and compares the proposed method with other demodulation schemes described in the literature. Specifically, stability, resolution, sensitivity, and frequency responses are considered.
- Publication:
-
Journal of the Optical Society of America (1917-1983)
- Pub Date:
- March 1979
- DOI:
- 10.1364/JOSA.69.000407
- Bibcode:
- 1979JOSA...69..407M
- Keywords:
-
- Acousto-Optics;
- Demodulation;
- Imaging Techniques;
- Laser Applications;
- Optical Scanners;
- Amplitude Modulation;
- Frequency Response;
- Phase Modulation;
- Systems Stability;
- Instrumentation and Photography