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Optical Surfaces Ltd. (Surrey, UK) offers laser beam expanders for high-power laser and Doppler shift LIDAR applications. Manufactured to better than lambda/10 surface accuracy, the off-axis design of the beam expanders produces no central obscuration. Alignment aids are supplied with each beam expander to ensure correct beam pointing. The all-reflecting design is achromatic and, with aluminum coatings, can operate from the UV to far IR without adjustment. The beam expanders are housed in a box assembly that provides for fixing to an optical table, and enables transportation to different sites without the need for internal realignment. Options include ultra-hard dielectric, protected silver, and gold laser coatings. Standard models include exit apertures of 100 mm, 150 mm, and 200 mm, with up to 20x magnification systems.

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