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High-power Ti:Sapphire lasers: Temporal contrast and spectral narrowing

Published online by Cambridge University Press:  19 June 2007

M Kalashnikov
Affiliation:
Max Born Institute for Nonlinear Optics and Ultrafast Spectroscopy, Berlin, Germany
K Osvay
Affiliation:
Max Born Institute for Nonlinear Optics and Ultrafast Spectroscopy, Berlin, Germany Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
W Sandner
Affiliation:
Max Born Institute for Nonlinear Optics and Ultrafast Spectroscopy, Berlin, Germany

Abstract

New extensions of the chirped pulse amplification (CPA) scheme designed specially for petawatt Ti:Sapphire lasers are considered. The two new schemes support a spectral bandwidth sufficient for 20 fs pulses and a temporal contrast of 1012. The Double CPA scheme consists of two CPA stages with an intermediate temporal pulse filtering for temporal contrast improvement. The scheme of Negative–Positive CPA amplification takes advantage of consecutive saturated amplification of down chirped and up chirped pulses. This allows a suppress imprint of gain narrowing, which usually limits the spectral bandwidth at the multi-terawatt power level, and reach the bandwidth in excess of 50 nm without using any direct spectral shaping of the pulse.

Type
Research Article
Copyright
© 2007 Cambridge University Press

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