Optical transmitter and anamorphic lens therefor

Abstract

An anamorphic lens for correcting aberration of a highly divergent beam from a laser source has first and second cylindrical surfaces having mutually perpendicular planes of symmetry. Each surface is defined from a generator polynomial including cross terms in two variables so as to correct aberration of light from a widely divergent source. Preferably, the generator polynomial is of the form z = x 2 R x + R x 2 - ( 1 + k x ) ⁢ ⁢ y 2 + y 2 R y + R y 2 - ( 1 + k y ) ⁢ ⁢ y 2 + α 10 ⁢ ⁢ x 2 + α 01 ⁢ ⁢ y 2 + α 20 ⁢ ⁢ x 4 + α 11 ⁢ ⁢ x 2 ⁢ ⁢ y 2 + α 02 ⁢ ⁢ y 4 + α 30 ⁢ ⁢ x 6 + α 21 ⁢ ⁢ x 4 ⁢ ⁢ y 2 + α 12 ⁢ ⁢ x 2 ⁢ ⁢ y 4 + α 03 ⁢ ⁢ y 6 ⁢ … The coefficients in this polynomial may be determined by the use of ray tracing software. The lens may be employed as a collimating lens in an optical transmitter e.g. for use in an amplifier package.

Dependencies are inferred from the claim text.