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음향광학변조필터의 이미지 이동 보상을 위한 프리즘 제안
류성윤(Sung Yoon Ryu),유장우(Jang-Woo You),곽윤근(Yoon keun Kwak),김수현(Soo hyun Kim) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.5
The Acousto-Optic Tunable Filter (AOTF) is a high-speed full-field monochromator which generates two spectrally filtered light beams with ordinary and extraordinary polarization state. Thus, AOTF is widely used to build full-field spectral imaging system or spectral domain interferometer. However, AOTF has a big problem that the angle of diffracted light changes according to the scanning of wavelength, which makes image shift on CCD plane. In this paper, we propose an analytic design of prism system to compensate the image shift. The detailed analysis of light paths in a prism and basic experimental results are presented to verify our proposed compensation method. The experimental results agree with simulation results based on suggested prism model and image shift is minimized at optimal condition. Also, it can be extended to compensate the image shift for ordinary and extraordinary polarized light simultaneously.