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

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.

References in corpus (4)

• Electromagnetic Angular Momentum
• Electromagnetic Force and Momentum
• On thermal effects in solid state lasers: the case of ytterbium-doped materials
• Hypergeometric-Gaussian Modes

Cited by in corpus (1)

• Structured light for ultrafast laser micro- and nanoprocessing