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Proceedings Paper

Diagnostic system for cryogenically cooled 10 Hz Yb:YAG laser
Author(s): Lucia Koubíková; Jiří Thoma; Jack A. Naylon; Lukáš Indra; Martin Fibrich; Daniel Kramer; Bedrich Rus
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Paper 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.

Paper Details

Date Published: 7 January 2015
PDF: 7 pages
Proc. SPIE 9442, Optics and Measurement Conference 2014, 94420N (7 January 2015); doi: 10.1117/12.2086616
Show Author Affiliations
Lucia Koubíková, Institute of Physics of the AS CR, v.v.i. (Czech Republic)
Jiří Thoma, Institute of Physics of the AS CR, v.v.i. (Czech Republic)
Jack A. Naylon, Institute of Physics of the AS CR, v.v.i. (Czech Republic)
Lukáš Indra, Institute of Physics of the AS CR, v.v.i. (Czech Republic)
Martin Fibrich, Institute of Physics of the AS CR, v.v.i. (Czech Republic)
Daniel Kramer, Institute of Physics of the AS CR, v.v.i. (Czech Republic)
Bedrich Rus, Institute of Physics of the AS CR, v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 9442:
Optics and Measurement Conference 2014
Jana Kovačičinová; Tomáš Vít, Editor(s)

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