Abstract
We describe real-time double-exposure interferometies with an internally self-pumped conjugator employed by a photorefractive crystal Cu:KNSBN. The device offers many advantages as a nondestructive testing device: elimination of the effects of turbulence or optical distortion, self-alignment, high reflectivity, and so on. In our experiment, an argon ion laser beam at 0.515 μm is expanded and collimated to a 4-cm diameter beam size. The collimated beam passes through a transparent test object and is focused into a photorefractive crystal Cu:KNSBN with 51% phase-conjugate reflectivity. A beam splitter separates the conjugate beam generated by the self-pumped conjugator, and a CCD camera receives the output interfering fringes formed in double exposure. In the first exposure, the image of the test object is conjugated by the self-pumped conjugator. Applying force to the test object, an internal shape change occurs. The image that its phase has changed is written in the crystal again. Th-en the interfering fringes are received by the CCD camera and are analyzed by a computer. Using this device, the defects of the test object can be inspected in real-time.
© 1991 Optical Society of America
PDF ArticleMore Like This
Daliang Sun, Quanzhong Jiang, Huanchu Chen, Jingjun Xu, and Simin Liu
PTu055 International Quantum Electronics Conference (IQEC) 1992
Zhang Guangyin, Xu Jingjun, Liu Simin, Wu Yuanqing, Song Yongyuan, and Chen Huanchu
MA3 Photorefractive Materials, Effects, and Devices II (PR) 1991
Y. Sun, Zhang He-Yi, M. G. Moharam, J. T. Lin, and Yuhuan Xu
TUL2 OSA Annual Meeting (FIO) 1989