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Proceedings Paper

0.5 terawatt laser based on a hybrid architecture for high energy diode-pumped lasers delivering sub-500 fs pulses
Author(s): Jean-Gabriel Brisset; Magali Durand; Emilien Gontier; Abdelhak Saci; Pierre Sevillano; Bastien Gavory; Antoine Courjaud
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Paper Abstract

An increasing number of scientific applications require highly energetic ultrafast laser system like OPA pumping, THz generation or filamentation. To address their requirements, a compact diode-pumped Terawatt-class laser was developed, this laser can deliver 220 mJ pulses at 50 Hz repetition rate and 415 fs pulse duration. The system is based on a CPA scheme starting with a synchronizable oscillator, a spectral shaper, then a regenerative amplifier and two multipass amplifiers. The laser’s modular structure allows for an upgrade with additional amplification stage. In order to maintain a large spectrum throughout the whole amplification, a spectrum modulator is used to shape the spectral amplitude of the seeded pulses. It allows the versatile shaping of the spectral bandwidth to efficiently compensate the spectral narrowing induced by the amplifiers. This spectrally shaped pulse is then seeded to a regenerative amplifier based on a Yb:CaF2 crystal. Thanks to its wide emission cross section and excellent storage efficiency, the pulse energy reached 30 mJ with a spectral bandwidth of 6nm centered at 1030 nm. This spectral shape is adapted to the two amplification stage which are based on Yb:YAG crystal. The first amplification multipass stage allows to increase the pulse energy to 90 mJ. The main amplification stage then increases the energy to 250 mJ. The energy is compressed by a pair of highly efficient gratings. The pulses are successfully compressed down to 415 fs with an output energy of 220 mJ. The beam after compression has an excellent spatial Gaussian shape, a remarkable pointing stability and a high Strehl ratio.

Paper Details

Date Published: 21 February 2020
PDF: 7 pages
Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 112591I (21 February 2020); doi: 10.1117/12.2544955
Show Author Affiliations
Jean-Gabriel Brisset, Amplitude Systèmes (France)
Magali Durand, Amplitude Systèmes (France)
Emilien Gontier, Amplitude Systèmes (France)
Abdelhak Saci, Amplitude Systèmes (France)
Pierre Sevillano, Amplitude Systèmes (France)
Bastien Gavory, Amplitude Systèmes (France)
Antoine Courjaud, Amplitude Systèmes (France)

Published in SPIE Proceedings Vol. 11259:
Solid State Lasers XXIX: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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