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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 11 — May. 26, 2008
  • pp: 8039–8049

ASE suppression in a high energy Titanium sapphire amplifier

Klaus Ertel, Chris Hooker, Steve J. Hawkes, Bryn T. Parry, and John L. Collier  »View Author Affiliations

Optics Express, Vol. 16, Issue 11, pp. 8039-8049 (2008)

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The energy required to generate ultrashort pulses with petawatt peak power from a Ti:sapphire laser system is a few tens of joules. To achieve this, the final amplifier must have a gain region of around 5 cm diameter that is uniformly pumped at high fluence. The high level of amplified spontaneous emission (ASE) in such an amplifier will seriously degrade its performance unless care is taken to minimise the transverse gain and the internal reflections from the crystal edges. In developing the amplifiers for the Astra Gemini laser system, we have combined the techniques of beam homogenisation and double-pass pumping of a lightly-doped crystal with a new index-matched absorber liquid. Our results demonstrate that this combined approach successfully overcomes the problem of gain depletion by ASE in a high-energyTi:sapphire amplifier.

© 2008 Optical Society of America

OCIS Codes
(140.3280) Lasers and laser optics : Laser amplifiers
(140.3590) Lasers and laser optics : Lasers, titanium
(140.5560) Lasers and laser optics : Pumping
(140.7090) Lasers and laser optics : Ultrafast lasers

ToC Category:
Lasers and Laser Optics

Original Manuscript: March 28, 2008
Revised Manuscript: May 2, 2008
Manuscript Accepted: May 14, 2008
Published: May 19, 2008

Klaus Ertel, Chris Hooker, Steve J. Hawkes, Bryn T. Parry, and John L. Collier, "ASE suppression in a high energy Titanium sapphire amplifier," Opt. Express 16, 8039-8049 (2008)

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