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Soliton-based pump-seed synchronization for few-cycle OPCPA

C. Y. Teisset, N. Ishii, T. Fuji, T. Metzger, S. Köhler, R. Holzwarth, A. Baltuška, A. M. Zheltikov, and F. Krausz

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Abstract

We demonstrate a significant simplification of the scheme for few-cycle Optical Parametric Chirped Pulse Amplification (OPCPA) which results in the elimination of a picosecond master oscillator and electronic synchronization loops. A fraction of a broadband seed pulse centered at 760 nm from a 70-MHz Ti:sapphire oscillator was frequency-shifted in a photonic crystal fiber to enable synchronized seeding of a picosecond Nd:YAG pump laser. The seed radiation at 1064 nm is produced in the soliton regime which makes it inherently more intense and stable in comparison with other methods of frequency conversion. The remaining fraction of the Ti:sapphire output is amplified with a FWHM bandwidth of 250 nm in a single timing-jitter-free OPCPA stage. Our work opens up the exciting possibility to use sub-picosecond pump pulses from highly efficient Yb-based amplifiers for jitter-less parametric amplification of carrier-envelope phase stabilized pulses from Ti:sapphire oscillators.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Layout of experimental setup for all-optically synchronized OPCPA. PCF, photonic crystal fiber; TFP, thin-film polarizer; CM, chirped-mirror pair; BS, 50% beamsplitter; λ/2, half-wave plate; λ/4, quarter-wave plate; Nd:YAG, side-cw-diode-pumped gain modules; FI, Faraday isolator; FR, Faraday rotator.

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Fig. 2.
Fig. 2. Frequency shift in the photonic crystal fiber. Solid curve shows an output spectrum optimized for injection seeding at 1064 nm. The input spectrum from the Ti:sapphire oscillator is shown as dashed curve.

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Fig. 3.
Fig. 3. Performance of the regenerative amplifier seeded with an optical solitonic pulse from PCF. (a), intracavity pulse train of pulses amplified to the energy of 0.2-mJ. (b), background-free autocorrelation traces obtained with and without an intracavity etalon for a fixed number of intracavity roundtrips. Red curves show Gaussian autocorrelation fits.

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Fig. 4.
Fig. 4. Results of timing-jitter-free single-pass parametric amplification. Solid curve, amplified seed spectrum that supports a 6-fs pulse duration assuming perfect recompression (inset); dashed curve, seed spectrum; dash-dotted curve, calculated parametric gain in a 3-mm BBO.

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