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An optimized Er gain band all-fiber chirped pulse amplification system

G. Imeshev, I. Hartl, and M. E. Fermann

Open Access Open Access

Abstract

We demonstrate an all-fiber Er chirped pulse amplification (CPA) system based on compression in photonic band gap fiber (PBGF) that produces 570 fs pulses with 310 nJ pulse energy. The dispersion of the PBGF is measured precisely and used to design a dispersion-matched nonlinearly-chirped fiber Bragg grating stretcher. We analyze the trade-offs of such all-fiber CPA system design and compare different PBGFs in terms of the derived figure of merit. Such system architecture should be scalable to few micro-Joule level pulse energies close to the compressor nonlinearity limit when PBGFs with improved figure of merit become available.

©2004 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. (a) Group delay and (b) the dispersion of the AIR-10-1550 PBGF as a function of wavelength.

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Fig. 2.
Fig. 2. Sketch of the all-fiber CPA system based on pulse stretching in the nonlinearly-chirped FBG, amplification in two Er pre-amplifiers, the Er/Yr LMA power amplifier and compression in the double-passed PBGF.

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Fig. 3.
Fig. 3. Autocorrelation traces of the pulses output from the all-fiber CPA system; calculated autocorrelation for a transform-limited pulse, 750 fs FWHM (dotted line); measured autocorrelation for the 73-nJ pulses, 1.04 ps FHWM (dashed line); measured autocorrelation for the 310-nJ pulses, 930 fs FWHM (solid line).

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Fig. 4.
Fig. 4. Measured spectrum of the 310-nJ pulses output from the all-fiber CPA system.

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Tables (1)

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Table 1. Comparison of different PBGFs

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Equations (5)

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U = β P peak D L Δ λ 10 − α L ⁄ 10 ,
U = β P peak Δ λ FOM ,
B = γ ∫ P ( z ) d z = γ P 0 L eff ,
L eff = 1.4 L D .
U NL ≈ 0.55 Δ λ D ⁄ γ .
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