Multiple-color null lens employing refractive and diffractive op

Details Multiple-color null lens employing refractive and diffractive op Multiple-color null lens employing refractive and diffractive op

1990-12-21

1992-10-13

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356124, 356359, G01B 902

Patent

active

051555530

ABSTRACT:
Disclosed is an apparatus (10) for null lens testing of an optical element (20). This apparatus incorporates both refractive (32, 36) and diffractive (30, 34) optical elements to create a null lens testing apparatus (10) tuned to two separate wavelengths. By combining or superimposing the interference patterns from the two wavelengths in an interferometer (12) using the two-wavelength holographic technique, the null lens testing apparatus (10) can desensitize the tests such that a single null testing apparatus (10) can be used to test an optical element (20) from its early fabrication stages to its final polishing stages.

REFERENCES:
patent: 4958931 (1990-09-01), Tatian
"Optical Shop Testing", Chapter 14, John Wiley & Sons, (1978).
Wyant, J. C., "Testing Aspherics Using Two-Wavelength Holography", Appl. Opt., 10, p. 2113 (1971).

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