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Femtosecond pulse generation and amplification in Yb-doped fibre oscillator-amplifier system

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Abstract

In recent times ytterbium (Yb) doped fibre-based mode-locked master oscillator and power amplifier have attracted a great deal of interest because of their inherent advantages like flexibility, reliability, compactness, high power handling capability and diffraction limited output beam quality as compared to the solid-state counterpart. But, to successfully develope of high-power femtosecond oscillator-amplifier system based on Ybdoped fibre, an appropriate choice of the mode-locking regime and the amplifier geometry are required. Development of an all-fibre integrated high-power Yb-doped fibre oscillator-amplifier system in which the advantages of a fibre-based system can be fully exploited remained a challenge as it requires the careful optimization of dispersion, nonlinearity, gain and ASE contribution.

In this article, femto-second pulse generation in Yb-doped fibre oscillator in different mode-locking regimes are reviewed and the details of development and characterization of an all-fibre, high-power, low-noise amplifier system seeded by an all-normal-dispersion mode-locked Yb-doped fibre laser oscillator is described. More than 10 W of average power is obtained from the fibre oscillator-amplifier system at a repetition rate of 43 MHz with diffraction-limited beam quality. Amplified pulses are de-chirped to sub-160 fs duration in a grating compressor. This is the first 10 W-level source of femtosecond pulses with completely fibre-integrated amplification comprised of commercially available components.

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Authors and Affiliations

  1. Solid State Laser Division, Raja Ramanna Centre for Advanced Technology, Indore, 452 013, India

    P. K. Mukhopadhyay

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  1. P. K. Mukhopadhyay
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Correspondence to P. K. Mukhopadhyay.

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Mukhopadhyay, P.K. Femtosecond pulse generation and amplification in Yb-doped fibre oscillator-amplifier system. Pramana - J Phys 75, 787–805 (2010). https://doi.org/10.1007/s12043-010-0162-0

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  • DOI: https://doi.org/10.1007/s12043-010-0162-0

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