ALLAN BERECZKI
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Artigo IPEN-doc 28141 Dynamically stable single frequency ring resonator from diode pumped Nd:YAG modules with 55.6 W of output power2021 - BERECZKI, ALLAN; FERREIRA, AMAURI A.; WETTER, NIKLAUS U.A Nd:YAG rod single-frequency ring laser based on side-pumped commercial modules is presented. Thermally induced birefringence compensation was applied in a dynamically stable resonator providing 55.6 W of continuous, linearly polarized, TEM00 output. The particular case of a symmetric ring resonator containing one or two focusing rods and a pair of curved mirrors was analyzed and a design technique is presented, allowing for easy, continuous shaping of the stability limits by changing only the distances in the resonator.Artigo IPEN-doc 24863 Dynamically stable Nd:YAG resonators with beam quality beyond the birefringence limit and pumping of a singly resonant optical parametric oscillator2018 - BERECZKI, ALLAN; LOPEZ, MARCIO A.P.A.; WETTER, NIKLAUS U.A simple, reliable, linearly polarized laser source with very high beam quality is demonstrated using standard diode-side-pumped Nd:YAG modules. The laser produced 30 W of output power with beam quality factor š2<1.15 over the entire range of input powers and beam quality of 1.02 at the laser operation point. This is, to our knowledge, the highest beam quality for a dynamically stable high-power laser that uses an optically isotropic crystal. The laser was used as a pump source for an optical parametric oscillator based on a periodically poled lithium niobate, producing wavelength in the 1.5ā3.8 Ī¼m range.