Image processing techniques for forward degenerate four-wave mixing experiment

Wei-Bo Wang; De-Ying Chen; Rong-Wei Fan

doi:10.1117/12.790927

22 February 2008 Image processing techniques for forward degenerate four-wave mixing experiment

Wei-Bo Wang, De-Ying Chen, Rong-Wei Fan

Proceedings Volume 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology; 662223 (2008) https://doi.org/10.1117/12.790927
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

Degenerate four-wave mixing (DFWM) is a parametric process constrained by conversation of momentum of the incident and reflected photons, which imposes the condition of phase matching on the incident and generated signal beams. However, phase-match is not automatically achieved in the forward folded boxcars geometry. Also, weak signal beams under the strong background of stray light are hardly positioned and distinguished. To solve the problems, a new image processing system for detecting forward DFWM spectroscopy on iodine vapor is reported. This system is composed of CCD camera, imaging processing card and the related software. With the help of the detecting system, phase matching can be easily achieved in the optical arrangement by crossing the two pumps and the probe as diagonals linking opposite corners of a rectangular box. The signal is generated in the center of the box and propagates along the fourth diagonal, thus providing good spatial separation from the intense pump beams and providing a way to position the PhotoMultiplier Tube (PMT). Also it is practical to know the effect of the pointing stability on the optical path by monitoring facula changing with the laser beam pointing and disturbs of the environment. Finally Real-time detecting the rate of signal to noise so as to timely decrease the stray light with correct methods. Steady DFWM signals have been obtained in the experiment. This system makes it feasible that the potential application of FG-DFWM is used as a diagnostic tool in combustion research and environment monitoring.

Citation Download Citation

Wei-Bo Wang, De-Ying Chen, and Rong-Wei Fan "Image processing techniques for forward degenerate four-wave mixing experiment", Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 662223 (22 February 2008); https://doi.org/10.1117/12.790927

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KEYWORDS

Image processing

Phase matching

Signal detection

Signal generators

Stray light

CCD cameras

Environmental monitoring

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