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Graphene-multilayer-saturable-absorber-based passively mode-locked Ho-doped fiber front-end for seeding of a 1-J/1-kW Ho:YAG cryogenically cooled thin-disk laser system (Conference Presentation)
Author(s): Jitka Černohorská; Martin Smrž; Michael Písařík; Reza Amani; Michal Jelínek; Pavel Peterka; Akira Endo; Tomáš Mocek
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Paper Abstract

Hi-tech industrial or biotechnological laser applications request for picosecond pulsed 2-um laser generating sub-1-J pulses in >kHz repetition range. At Hilase development of laser system with target to generate 1-J picosecond pulses with 1-kHz repetition rate has started. Design of the system based on Ho:YAG thin-disk generating at 2.1-um is divided into several phases. First phase includes demonstration of new mode-locked graphen-based saturable absorber Ho-doped fiber laser concept followed by preamplifier systems delivering 10-uJ pulses. Pulses are then amplified to >10-mJ level in Ho:YAG thin-disk regenerative amplifier operating at 10-kHz, and finally amplified in double stage cryogenically-cooled multi-pass amplifier to 1-J at 1-kHz so average output power reaches 1-kW in mid-IR. We present a concept of this laser system with emphasize on the front-end and the first regen. The holmium fiber front-end is pumped by a continuous wave 0.5-W thulium fiber laser generating at wavelength of 1950-nm. Mode-locking in the oscillator is reached by graphene multilayer optical element as a passive saturable absorber (GSA). The GSA provides broadband wavelength operation and is promising for MIR sources. In the laser setup, the GSA is placed in a free-space cavity as a part of ring laser configuration. This oscillator produces <10-ps-pulses with ~nJ energy and <40-MHz repetition rate. The repetition rate reduces acousto-optic modulator, pulses are pre-amplified in a chain containing Ho-doped fibers and a single crystal fiber to 10-uJ/10-to-100-kHz, and seeded to thin-disk regen. We expect demonstration of the front-end, detailed design of first regenerative amplifier and conceptual design of full system.

Paper Details

Date Published: 14 March 2018
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Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 1051108 (14 March 2018); doi: 10.1117/12.2290580
Show Author Affiliations
Jitka Černohorská, Institute of Physics of the ASCR v.v.i. (Czech Republic)
Czech Technical Univ. in Prague (Czech Republic)
Martin Smrž, Institute of Physics of the ASCR v.v.i. (Czech Republic)
Michael Písařík, Institute of Physics of the ASCR v.v.i. (Czech Republic)
Reza Amani, Institute of Physics of the ASCR v.v.i. (Czech Republic)
Michal Jelínek, Czech Technical Univ. in Prague (Czech Republic)
Pavel Peterka, Institute of Photonics and Electronics of the ASCR, v.v.i. (Czech Republic)
Akira Endo, Institute of Physics of the ASCR v.v.i. (Czech Republic)
Tomáš Mocek, Institute of Physics of the ASCR v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 10511:
Solid State Lasers XXVII: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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