High-pulse-energy, Q-switched Ho3+:YAG laser for mid-infrared optical parametric oscillator pumping

Michael Griesbeck; Hendrik Büker; Madeleine Eitner; Katharina Goth; Peter Braesicke; Marc Eichhorn; Christelle Kieleck

doi:10.1117/12.2582997

5 March 2021 High-pulse-energy, Q-switched Ho³⁺:YAG laser for mid-infrared optical parametric oscillator pumping

Michael Griesbeck, Hendrik Büker, Madeleine Eitner, Katharina Goth, Peter Braesicke, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX; 116700D (2021) https://doi.org/10.1117/12.2582997
Event: SPIE LASE, 2021, Online Only

Abstract

We report on an actively Q-switched high-pulse-energy Ho³⁺:YAG laser in-band pumped by a Tm³⁺-doped fiber laser, both operated at room temperature. The Ho³⁺:YAG active medium inside a plane-plane cavity is pumped using a commercial Tm³⁺-doped fiber laser at 1908 nm from one side. In continuous operation a maximum power of 20.1 W with a slope efficiency of 45.1%, central wavelength of 2090 nm and a beam quality factor M² below 1.5 were achieved. Q-switched operation was achieved using a Brewster-cut acousto-optic modulator (AOM) based on crystalline Quartz. During Q-switching the incident power was kept stable at 47 W to obtain an M² of 1.3 and a stable thermal lens inside the laser crystal. With the variation of the repetition frequency a lower limit of the quasi-continuous pulsed regime was investigated and measured to be approximately 3 kHz. The maximum pulse energy in Q-switching operation was achieved with a repetition frequency of 700 Hz leading to an energy of 15 mJ at 12.1 ns pulse width, corresponding to a peak power of 1.2 MW. The laser showed no sign for a loss of performance during many hours of testing. Using this laser as a pump source for a double resonant OPO, a maximum mid-infrared output power of 6.3 W could be achieved at a repetition frequency of 2 kHz, accompanied by a low threshold power of 1.6 W and a slope efficiency of 49.2%.

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Michael Griesbeck, Hendrik Büker, Madeleine Eitner, Katharina Goth, Peter Braesicke, Marc Eichhorn, and Christelle Kieleck "High-pulse-energy, Q-switched Ho³⁺:YAG laser for mid-infrared optical parametric oscillator pumping", Proc. SPIE 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX, 116700D (5 March 2021); https://doi.org/10.1117/12.2582997

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