Diagnostic system for cryogenically cooled 10 Hz Yb:YAG laser

Lucia Koubíková; Jiří Thoma; Jack A. Naylon; Lukáš Indra; Martin Fibrich; Daniel Kramer; Bedrich Rus

doi:10.1117/12.2086616

7 January 2015 Diagnostic system for cryogenically cooled 10 Hz Yb:YAG laser

Lucia Koubíková, Jiří Thoma, Jack A. Naylon, Lukáš Indra, Martin Fibrich, Daniel Kramer, Bedrich Rus

Proceedings Volume 9442, Optics and Measurement Conference 2014; 94420N (2015) https://doi.org/10.1117/12.2086616
Event: Optics and Measurement Conference 2014, 2014, Liberec, Czech Republic

Abstract

The ELI Beamlines facility will house repetition rate high-power lasers with pulse durations down to 15 fs and over petawatt peak powers. Our research group participates in the construction of a cryogenically cooled Yb:YAG multi-slab amplifier; part of the L2 beamline. The system shall provide square, super-Gaussian beam with nearly 2 ns pulses with rectangular temporal profile and energy of up to 10 J at 10 Hz. The laser will provide pump beams for broadband OPCPA stages. The diagnostic system of the pump laser is critical for the correct performance analysis, stabilization feedback and mostly for the machine interlock system as damages of the expensive optical components can develop very fast with the 10 Hz repetition rate. The diagnostic system provides key laser parameters and characteristics in temporal, spectral and spatial domain. The paper describes testing of the setup for measurements of the final 10 J output. Its design is based on a combination of optical wedges and diffractive sampler to facilitate multiple diagnostics on a relatively small footprint. The laser diagnostics package covers measurements in spatial domain such as near-field, far-field, or wavefront analysis, further optical spectrum, pulse energy and temporal shape. In order to detect possible damage dark-field analysis was implemented as well. The final setup was modeled in optical design software (Radiant Zemax) to understand its behavior and later tested together with real-time LabVIEW code developed by our group as being part of the machine interlock system. The first results of the tests as well as detailed description of the diagnostics package design are presented.

Citation Download Citation

Lucia Koubíková, Jiří Thoma, Jack A. Naylon, Lukáš Indra, Martin Fibrich, Daniel Kramer, and Bedrich Rus "Diagnostic system for cryogenically cooled 10 Hz Yb:YAG laser", Proc. SPIE 9442, Optics and Measurement Conference 2014, 94420N (7 January 2015); https://doi.org/10.1117/12.2086616

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