Abstract
Frequency doubled Ar-ion lasers have become important UV sources for many different applications in photonics and semiconductor industry. In this study, we analyze the beam characteristics of an UV beam generated by a frequency doubled Ar-ion laser by using a second harmonic generation (SHG) model. Beam profiles at different locations are computed and compared with the measured profiles. The beam propagation factor, M 2, is also estimated using the SHG model and the parameters of the laser. It has been demonstrated that in the walk-off plane the profiles of the second harmonic beam are not Gaussian, and changing along the beam propagation direction. The calculations also reveal the wavefront shapes of the second-harmonic beam at different locations. As the existence of the walk-off, the shapes of the wavefronts are asymmetrical, and changing with the distance of propagation from the near- to far-field.
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