Passively Q-switched sub-100 ps Yb3+:YAG/Cr4+:YAG microchip laser: experimental results and numerical analysis

Andreas Giese; Michael Körber; Konstantina Kostourou; Daniel Kopf; Manfred Kottcke; Jan Lohbreier; Josef M. Schmidbauer; Bernd Braun

doi:10.1117/12.2649057

8 March 2023 Passively Q-switched sub-100 ps Yb³⁺:YAG/Cr⁴⁺:YAG microchip laser: experimental results and numerical analysis

Andreas Giese, Michael Körber, Konstantina Kostourou, Daniel Kopf, Manfred Kottcke, Jan Lohbreier, Josef M. Schmidbauer, Bernd Braun

Author Affiliations +

Proceedings Volume 12399, Solid State Lasers XXXII: Technology and Devices; 123990S (2023) https://doi.org/10.1117/12.2649057
Event: SPIE LASE, 2023, San Francisco, California, United States

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Abstract

We demonstrate sub-100 ps pulses with a Yb³⁺:YAG microchip laser passively Q-switched by a Cr⁴⁺:YAG saturable absorber. By introducing a subcavity, the laser threshold and the saturation energy are decreased which helps to prevent damage and to vary the effective emission and absorption cross sections. Pulse widths of 84 ps, repetition rates of 3.3 kHz and pulse energies of 32 μJ are achieved. This allows direct micromaterial processing e.g. for ophthalmic surgeries. To the best of our knowledge, this is the first sub-100 ps Yb³⁺:YAG/Cr⁴⁺:YAG microchip laser. A new approximation is used to calculate the rate equations for multiple longitudinal modes and to determine the threshold for single-longitudinal-mode operation.

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Andreas Giese, Michael Körber, Konstantina Kostourou, Daniel Kopf, Manfred Kottcke, Jan Lohbreier, Josef M. Schmidbauer, and Bernd Braun "Passively Q-switched sub-100 ps Yb³⁺:YAG/Cr⁴⁺:YAG microchip laser: experimental results and numerical analysis", Proc. SPIE 12399, Solid State Lasers XXXII: Technology and Devices, 123990S (8 March 2023); https://doi.org/10.1117/12.2649057

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