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Near-diffraction-limited laser beam shaping with diamond-turned aspheric optics

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Abstract

We used a pair of diamond-turned CaF2 aspheres to convert the pure TEM00 Gaussian spatial profile output of a diode-pumped Nd:YAG laser oscillator into a super-Gaussian intensity profile with a nearly flat phase front. The resulting super-Gaussian beam was nearly diffraction limited with an M2 of 1.75; in the near field the 5-mm diameter beam retained a nominally flat-top intensity distribution without significant diffraction peaks for an excellent working distance of more than 50 cm. A 10% improvement in amplifier-energy extraction obtained by use of the reshaped beam is demonstrated.

© 1997 Optical Society of America

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