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arXiv · 2005.05168

Improving the beam quality factor ($M^2$) by phase-only reshaping of structured light

Stirling Scholes·Andrew Forbes
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Abstract

Laser brightness is crucial in many optical processes, and is optimised by high power, high beam quality (low $M^2$) beams. Here we show how to improve the laser beam quality factor (reducing the $M^2$) of arbitrary structured light fields in a lossless manner using continuous phase-only elements, thus allowing for the increase in brightness by a simple linear optical transformation. We demonstrate the principle with four high $M^2$ initial beams, converting each to a Gaussian ($M^2 \approx 1$) with a dramatic increase in brightness of $>10 \times$. This work puts a new perspective on the old debate of improving laser beam quality with binary diffractive optics, while providing a practical approach to enhancing laser brightness for arbitrary input beams.

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Stirling Scholes, Andrew Forbes. 2020-05-11. Improving the beam quality factor ($M^2$) by phase-only reshaping of structured light. https://doi.org/10.1364/ol.397493

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