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Abstract

An apparatus for and a method of correcting chromatic aberration in a multiwavelength input light beam deflection system incorporating a magneto-optic diffraction grating is disclosed. The diffraction grating generates a chromatic aberration induced plurality of first order light beams from the multiwavelength input light beam, each different wavelength light beam being deflected a correspondingly different angle .lambda. by the diffraction grating. Correction plates, designed to provide zero chromatic correction for a wavelength .lambda..sub.o with corresponding positive and negative chromatic correction for wavelengths about the wavelength .lambda..sub.o, and associated lenses, parallelize, focus and coaxialize the first order light beams along an output optical axis whereby the chromatic aberration induced first order light beams are combined at the output of the apparatus along an output optical axis, the deflection angle of which is determined by the diffraction grating induced deflection angle of the light of wavelength .lambda..sub.o.

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First Claim