Testing aspherics using two-wavelength holography
Abstract
It is shown that both single exposure and double exposure two-wavelength holography provide a good method of using visible light to obtain an interferogram identical to what would be obtained if a longer nonvisible wavelength were used. Both techniques provide for the real-time adjustment of defocus and tilt in the final interferogram. When both hologram exposures are made simultaneously, the sensitivity to air turbulence is essentially the same as if the longer nonvisible wavelength were used. Results are shown for testing both lenses and mirrors at equivalent wavelengths at 6.45 micro, 9.47 micro, 14.20 micro, 20.22 micro, and 28.50 micro obtained by using an argon laser for the visible light source.
References
Citations
Holographic interferometry using two-wavelength holography for the measurement of large deformations
Testing aspheric surfaces with computer-generated holograms: analysis of adjustment and shape errors
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