A mathematical model of a laser diode beam propagating through a collimating lens is presented. Wave propagation beyond the paraxial approximation is studied. The phase delay of the laser diode wave in passing through the lens is analyzed in detail. The propagation optical field after the lens is obtained from the diffraction integral by the stationary phase method. The model is employed to predict the light intensity at various beam cross sections, and the computed intensity distributions are in a good agreement with the corresponding measurements.
© 2010 Optical Society of America
Lasers and Laser Optics
Original Manuscript: September 18, 2009
Manuscript Accepted: December 4, 2009
Published: January 20, 2010
Xu Qiang, Han Yiping, and Cui Zhiwei, "Characteristic of laser diode beam propagation through a collimating lens," Appl. Opt. 49, 549-553 (2010)