The laser diode(LD) beam propagate through the collimating lens is studied here beyond the paraxial approximation, the
ray from the LD entering the lens at coordinates on one face emerges at approximately the same coordinate on the
opposite face. The lens delays an incident wavefront by an amount proportional to the thickness of the lens at each point,
Further propagation of this field can be adequately represented by the calculation of the Rayleigh-Sommerfeld (RS)
diffraction integral, and the stationary-phase method is employed in order to find the asymptotic expansion of the
diffraction integral. The propagation optical field after the lens is obtained. The model employed to predict the light
intensity at various beam cross sections.
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