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Double Pass Monochromator Multiple pass, double dispersion accessory optics are now available for the 0.67 to 2-meter focal length monochromators from McPherson, Inc. McPherson multiple pass monochromators allow you to work with low f/number, great throughput and twice the resolution. Unique 'doubling' of resolution and dispersion is achieved by plane folding mirrors that multiply the monochromator focal length. Inside the instrument, the fold mirrors repeat the light path.
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