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New technology to correct phase distortion of laser beam

The Advanced Photon Research Center at the Kansai Research Establishment of the Japan Atomic Energy Research Institute (JAERI) has developed new technology to correct a large phase distortion of laser beams. The research center is located in Kansai Science City in Kizu-cho, Soraku-gun, Kyoto Prefecture.
Technology to obtain ultra- high focal intensity is necessary for research on the interaction of laser beams and materials. However, a strong laser beam is highly distorted because of the transformation of laser crystals by thermal effect, and the beam intensity at the focal point cannot be increased.
The research center had earlier succeeded in an experiment using a deformable mirror to rectify the distortion, but it had such drawbacks as poor accuracy of correcting the distortion, as well as being too large and too expensive.
The new technology developed by the research center uses a ""phase conjugator"" that is designed to cancel any laser beam phase distortion by generating opposite phase beam called a ""phase conjugated wave"" to correct the laser beam phase. The device is 1/10 the size of the existing mirror system. It is adaptable to high power lasers.
For inquiries, please contact Kansai Research Establishment, JAERI (E-mail www-admin @www.jaeri.go.jp URL http://www.jaeri.go.jp/)