Intra-cavity metamorphosis of a Gaussian beam to flat-top distribution

Darryl Naidoo; Igor Litvin; Alexander Laskin; Andrew Forbes

doi:10.1117/12.2039106

4 March 2014 Intra-cavity metamorphosis of a Gaussian beam to flat-top distribution

Darryl Naidoo, Igor Litvin, Alexander Laskin, Andrew Forbes

Proceedings Volume 8960, Laser Resonators, Microresonators, and Beam Control XVI; 89601H (2014) https://doi.org/10.1117/12.2039106
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

We explore an intra-cavity beam shaping approach to generate a Gaussian distribution by the metamorphosis of a Gaussian beam into a flat-top distribution on opposing mirrors. The concept is tested external to the cavity through the use of two spatial light modulators (SLM), where the first SLM is used to transform a collimated Gaussian into a flat-top distribution and the second SLM is encoded with the conjugate phase of the flat-top for conversion back to a Gaussian. We implement this intra-cavity selection through the use of two optical elements of the refractive variant that are designed from the phase profiles addressed to the SLMs. We consider a solid-state diode side-pumped laser resonator that consists of two planar mirrors where the refractive optics are positioned at the mirrors. We out couple the Gaussian and show that the output beam size is comparable with the theoretical predictions and that we have an increase in optical brightness when compared to the cavity without any optics.

Citation Download Citation

Darryl Naidoo, Igor Litvin, Alexander Laskin, and Andrew Forbes "Intra-cavity metamorphosis of a Gaussian beam to flat-top distribution", Proc. SPIE 8960, Laser Resonators, Microresonators, and Beam Control XVI, 89601H (4 March 2014); https://doi.org/10.1117/12.2039106

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