An astigmatic and elliptically diverging laser beam generated by a gain-guided laser diode can be converted into a collimated and circular beam with a single specially designed lens. The designed lens also corrects for the astigmatism present in the laser diode. The input surface of the lens has a different concave and convex aspherical profile in the transverse and the longitudinal direction, respectively, for astigmatism correction. The output surface possesses a convex aspherical and a straight profile in the transverse and the longitudinal direction, respectively, for collimation and circularization of the final output laser beam.
© 2000 Optical Society of America
(080.2740) Geometric optics : Geometric optical design
(220.1000) Optical design and fabrication : Aberration compensation
(220.1250) Optical design and fabrication : Aspherics
(220.3620) Optical design and fabrication : Lens system design
Zhou Xiao-qun, Bryan Ngoi Kok Ann, and Koh Soon Seong, "Single Aspherical Lens for Deastigmatism, Collimation, and Circularization of a Laser Beam," Appl. Opt. 39, 1148-1151 (2000)