Abstract

We present a simple and robust method for brightness enhancement, efficiently transforming a radially polarized LG (0,1)* mode into a nearly Gaussian beam of much higher quality. We use for this a spatially variable retardation plate and a spatial filter. The analysis shows that the transformation yields an increase in brightness by a factor of 3.4. In the experiment, we transformed a high-power Nd:YAG radially polarized (0,1)* LG beam with power of 70W and M2=2.6 into a nearly Gaussian beam with M2=1.36. This resulted in brightness enhancement by a factor of 2.6.

© 2007 Optical Society of America

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