1 December 1991 Shared aperture for two beams of different wavelength using the Talbot effect
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Abstract
A shared aperture using only reflective optics for two coherent beams with different wavelengths is desired. Beams that share an aperture are colinear, and they have the same transverse phase profile across the aperture as their respective sources. A shared aperture system composed entirely of reflective phase gratings is presented here. Using the Talbot effect that is observed in Fresnel diffraction from periodic objects, the phase of the beams is preserved, and the efficiency of the system is maximized. An experimental Talbot shared aperture system using HeNe and HeCd beams has an efficiency of 88.1% for the HeNe beam and 70.3% for the HeCd beam. These measured efficiencies agree well with computer simulations.
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Scott Daniel Hector, Scott Daniel Hector, Gary J. Swanson, Gary J. Swanson, } "Shared aperture for two beams of different wavelength using the Talbot effect", Proc. SPIE 1555, Computer and Optically Generated Holographic Optics; 4th in a Series, (1 December 1991); doi: 10.1117/12.50635; https://doi.org/10.1117/12.50635
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