Intellium™ interferometer

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The patented SBSI is a small beam lateral shear interferometer that uses an air gap between glass plates to shear the beam and then projects a magnified interference fringe pattern on a camera or fluorescent viewing screen. Optical aberrations can be identified and corrected while viewing the SBSI fringe pattern in real-time. For example, coma can be corrected by changing the tilt of a collimating lens in an optical system so the fringes on the SBSI change from curved to straight. A reference line on the SBSI screen indicates the best focus (collimation) angle for the fringes. When the fringes are parallel to the SBSI reference line, all optical aberrations are minimized. Beams can be checked directly or in reflection using a rotating beam-splitter cube mounted on the front of the SBSI.

Focus alignment sensitivity is approximately 130 micro radians of beam divergence, corresponding to 3° rotation of the fringes for 3½ fringes. Each SBSI is optimized for 3½ fringes for a specific wavelength and beam diameter, but every SBSI can be used to check beams over a certain range of wavelengths and diameters. Please inquire about special SBSI designs that are optimized for your application.

Article from Engineering Synthesis Design,

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