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Proceedings Paper

Development of cryogenic Yb:YAG ceramics amplifier for over 100 J DPSSL
Author(s): T. Sekine; Y. Takeuchi; T. Kurita; Y. Hatano; Y. Muramatsu; Y. Mizuta; Y. Kabeya; Y. Tamaoki; Y. Kato
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Paper Abstract

A high gain cryogenic Yb:YAG ceramics laser amplifier for a high energy laser amplification system has been developed. The laser system consists of a fiber oscillator and two stage LD pumped cryogenic Yb:YAG ceramic amplifiers. The preamplifier stage has a 5-pass laser amplifier head and the main amplifier stage has a 2-pass laser amplifier head, respectively. The preamplifier obtained an average stored energy density of 0.836 J/cc and small-signal gain (SSG) of 60 with 33 J of stored energy. Then about 1 μJ of input energy from the oscillator was amplified to 3.6 J. The main amplifier head had four pumping LD modules which irradiated the Yb:YAG ceramics directly. This original angular pumping scheme ideally increases irradiation intensity and homogenizes irradiation pattern on the Yb:YAG ceramics due to superposition effect of all of the LD modules. A maximum peak power of over 100 kW was generated by one LD module. When the output energy of the LD modules was 450 J, a 20 of SSG at single pass was obtained. Stored energy density was evaluated to 0.429 J/cc when 148 J energy was stored in 346 cc of Yb:YAG ceramics. As a result, a 55-J output energy with 10 ns pulse duration was demonstrated at a pumping energy of 450 J. The optical-tooptical conversion efficiency which includes transmissivity of the LD modules was 12 %. The extraction efficiency was estimated to 37%.

Paper Details

Date Published: 17 February 2017
PDF: 6 pages
Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 100820U (17 February 2017); doi: 10.1117/12.2254027
Show Author Affiliations
T. Sekine, Hamamatsu Photonics K.K. (Japan)
Y. Takeuchi, Hamamatsu Photonics K.K. (Japan)
T. Kurita, Hamamatsu Photonics K.K. (Japan)
Y. Hatano, Hamamatsu Photonics K.K. (Japan)
Y. Muramatsu, Hamamatsu Photonics K.K. (Japan)
Y. Mizuta, Hamamatsu Photonics K.K. (Japan)
Y. Kabeya, Hamamatsu Photonics K.K. (Japan)
Y. Tamaoki, Hamamatsu Photonics K.K. (Japan)
Y. Kato, Hamamatsu Photonics K.K. (Japan)

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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