Optical: systems and elements – Diffraction – From zone plate
Patent
1995-04-13
1998-10-06
Dzierzynski, Paul M.
Optical: systems and elements
Diffraction
From zone plate
359566, 359355, 356345, 356360, G02B 2744, G02B 518, G01B 902, G01B 1100
Patent
active
058186328
ABSTRACT:
A multi-element refractive/diffractive lens system, especially useful in an interferometer of the Fizeau type for forming a partially reflective end of the cavity and focusing collimated laser light at a focus in the cavity, uses a plurality of lens elements all of which are plano concave or plano convex singlets and may be either spherical or cylindrical. The lens has a diffractive element which compensates for aberrations due to the refractive elements of the lens system and enables the lens system to be formed from relatively few refractive elements which are all plano-convex or plano-concave singlets thereby providing cost savings arising out of the reduction in the amount of glass material and number of lens elements. Since the lens system is especially suitable for use in a Fizeau type interferometer, it may be of the type called a Fizeau lens.
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Chang Audrey
Dzierzynski Paul M.
Lukacher K.
Lukacher M.
Melles Griot, Inc
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