The output of a semiconductor laser can be approximated described by a Gaussian function w...

The output of a semiconductor laser can be approximated described by a Gaussian function with two different widths along the transverse (wT) and lateral (wL) directions as

where x and y represent axes parallel and perpendicular to the junction plane. Typically wT ≈ 0.5 μm and wL = 2 μm. Discuss the far field of this beam (see Fig. 20.27).