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Proceedings Paper

High power lasers for gamma source
Author(s): Magali Durand; Damien Sangla; Benoit Trophème; Pierre Sevillano; Alexis Casanova; Laurianne Caillon; Antoine Courjaud
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Paper Abstract

A high intensity Gamma source is required for Nuclear Spectroscopy, it will be delivered by the interaction between accelerated electron and intense laser beams. Those two interactions lasers are based on a multi-stage amplification scheme that ended with a second harmonics generation to deliver 200 mJ, 3.5 ps pulses at 515 nm and 100 Hz.

A t-Pulse oscillator with slow and fast feedback loop implemented inside the oscillator cavity allows the possibility of synchronization to an optical reference. A temporal jitter of 120 fs rms is achieved, integrated from 10 Hz to 10 MHz.

Then a regenerative amplifier, based on Yb:YAG technology, pumped by fiber-coupled QCW laser diodes, delivers pulses up to 30 mJ. The 1 nm bandwidth was compressed to 1.5 ps with a good spatial quality: M2 of 1.1. This amplifier is integrated in a compact sealed housing (750x500x150 cm), which allows a pulse-pulse stability of 0.1% rms, and a long-term stability of 1,9% over 100 hours (with +/-1°C environment).

The main amplification stage uses a cryocooled Yb:YAG crystal in an active mirror configuration. The crystal is cooled at 130 K via a compact and low-vibration cryocooler, avoiding any additional phase noise contribution, 340 mJ in a six pass scheme was achieved, with 0.9 of Strehl ratio. The trade off to the gain of a cryogenic amplifier is the bandwidth reduction, however the 1030 nm pulse was compressed to 3.5 ps.

Paper Details

Date Published: 17 February 2017
PDF: 7 pages
Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 100821E (17 February 2017); doi: 10.1117/12.2250280
Show Author Affiliations
Magali Durand, Amplitude Systèmes (France)
Damien Sangla, Amplitude Systèmes (France)
Benoit Trophème, Amplitude Systèmes (France)
Pierre Sevillano, Amplitude Systèmes (France)
Alexis Casanova, Amplitude Systèmes (France)
Laurianne Caillon, Amplitude Systèmes (France)
Antoine Courjaud, Amplitude Systèmes (France)


Published in SPIE Proceedings Vol. 10082:
Solid State Lasers XXVI: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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