Holography at 10.6 µm

D. W. Sweeney; W. H. Stevenson; N. C. Gallagher

doi:10.1117/12.958440

14 May 1980 Holography at 10.6 µm

D. W. Sweeney, W. H. Stevenson, N. C. Gallagher

Proceedings Volume 0215, Recent Advances in Holography; (1980) https://doi.org/10.1117/12.958440
Event: 1980 Los Angeles Technical Symposium, 1980, Los Angeles, United States

Abstract

Reflective holographic optical elements offer a number of advantages over conventional optical elements at the 10.6 μm wavelength of the CO₂ laser. One proposed application is to irradiate the appropriate infrared hologram with a high power CO₂ laser and use the projected real image for laser materials processing. The required holograms can be ob-tained using computer generation, direct recording at 10.6 μm, or by recording holograms in the visible and converting them to phase reflection holograms. An analysis of the aberrations introduced when holograms are recorded in the visible and the image reconstructed at 10.6 μm shows that aberrations can be made acceptably small even for extended images. A statistical analysis of the diffraction efficiency of computer generated holograms for extended objects with a uniform phase distribution shows that a realistic value for diffraction efficiency is about 28% as compared to about 40% for a simple point object. Phase reflection holograms fabricated using a copper electroplating method have good surface quality and a diffraction efficiency of about 30%.

Citation Download Citation

D. W. Sweeney, W. H. Stevenson, and N. C. Gallagher "Holography at 10.6 µm", Proc. SPIE 0215, Recent Advances in Holography, (14 May 1980); https://doi.org/10.1117/12.958440

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