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High-power femtosecond Yb-doped fiber amplifier

J. Limpert, T. Schreiber, T. Clausnitzer, K. Zöllner, H.-J. Fuchs, E.-B. Kley, H. Zellmer, and A. Tünnermann

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Abstract

We report on the generation of linearly chirped parabolic pulses with 17-W average power at 75 MHz repetition rate and diffraction-limited beam quality in a large-mode-area ytterbium-doped fiber amplifier. Highly efficient transmission gratings in fused silica are applied to recompress these pulses down to 80-fs with an efficiency of 60%, resulting in a peak power of 1.7 MW. Power scaling limitations given by the amplifier bandwidth are discussed.

©2002 Optical Society of America

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Supplementary Material (1)

Media 1: AVI (1976 KB)     

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Figures (16)
Fig. 1.
Fig. 1. The Movie (1.9 MB) shows the evolution of a parabolic pulse in a nonlinear fiber amplifier in the normal dispersion regime

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Fig. 2.
Fig. 2. Illustration of the pulse and spectral width in a parabolic fiber amplifier subject to the propagation distance

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Fig. 3.
Fig. 3. Experimental setup of the parabolic pulse fiber amplifier

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Fig.4.
Fig.4. Calculated diffraction efficiency of the binary 1250 lines/mm transmission grating in fused silica as a function of duty cycle and groove depth

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Fig.5.
Fig.5. Calculated diffraction efficiency depending on the wavelength and the angle of incidence

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Fig. 6.
Fig. 6. Scanning-electron microscope picture of the transmission grating in fused silica fabricated by electron beam writing

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Fig. 7.
Fig. 7. Output power characteristics of the large-mode-area fiber based amplifier

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Fig. 8.
Fig. 8. Measured autocorrelation trace of the output pulses from the fiber amplifier

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Fig. 9.
Fig. 9. Experimentally obtained output spectrum of the fiber amplifier

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Fig. 10.
Fig. 10. Calculated output spectra of the fiber amplifier at different output energies

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Fig. 11.
Fig. 11. (a) Calculated pulse shape and temporal phase of the parabolic pulses

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Fig. 11.
Fig. 11. (b) Calculated autocorrelation trace of the parabolic pulses

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Fig. 12.
Fig. 12. Intensity autocorrelation trace of the recompressed 80-fs pulses (dashed curve: fit)

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Fig. 13.
Fig. 13. (a) Measured FROG spectrogram after the grating pair compressor

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Fig. 13.
Fig. 13. (b) Retrieved temporal intensity and phase of the high power 80-fs pulses

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Fig. 14.
Fig. 14. Measured autocorrelation trace at an output power of 20 W of the fiber amplifier

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Equations (3)

Equations on this page are rendered with MathJax. Learn more.

i ∂ A ∂ z = 1 2 β 2 ∂ 2 A ∂ T 2 − γ ∣ A ∣ 2 A + i g 2 A
Δ T i , opt = 3 ∙ g − 2 / 3 ∙ ( γ β 2 / 2 ) 1 / 3 ∙ E i 1 / 3
E i , opt = 2 ∙ ( Δ T i ) 3 ∙ g 2 27 ∙ γ β 2 .
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