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Pulse-compression down to 20 fs using a photonic crystal fiber seeded by a diode-pumped Yb:SYS laser at 1070 nm

Frédéric Druon and Patrick Georges

Open Access Open Access

Abstract

We studied experimentally and theoretically the pulse compression using a zero-dispersion photonic crystal fiber in order to optimize the pulse duration and pulse shape. 20.3-fs pulses centered at 1070 nm have been produced using a diode-pumped system based on Yb:SYS crystal. The limitations such as pre-pulse amplitude or solitonic fission have also been studied.

©2004 Optical Society of America

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Figures (15)
Fig. 1.
Fig. 1. Experimental setup.

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Fig. 2.
Fig. 2. Evolution of spectra versus the coupled power in the fiber (in log scale).

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Fig. 3.
Fig. 3. Experimental and theoretical spectra (due to SPM, SS and TOD) for a coupled average power about 45 mW (Φ SPM ≈2π).

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Fig. 4.
Fig. 4. Theoretical, retrieved and experimental non-collinear autocorrelation traces.

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Fig. 5.
Fig. 5. Theoretical and experimental retrieved pulse shape and phase.

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Fig. 6.
Fig. 6. Example of interferometric autocorrelations for Φ SPM ≈2π. The fitting assuming a pulse shape given by the model allows a fairly accurate estimation of the pulse duration.

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Fig. 7.
Fig. 7. Pulse duration of compressed pulses after the prism-compressor and influence of the pre-pulse amplitude.

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Fig. 8.
Fig. 8. Experimental and theoretical spectra for Φ SPM ≈2.5π(≈57 mW) just below the SRS splitting.

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Fig. 9.
Fig. 9. XFROG traces for different non-linear phase shifts: the first column represents XFROG[Efiber,Einput] which puts the emphasis on the spectrum generation by SPM in the PCF fiber; the second column represents XFROG[Ecompressed,ETF] which puts the emphasis on the compression efficiency and the third column represents XFROG[Ecompressed,ETF]-XFROG[ETF,ETF] which puts the emphasis on the compressed-pulse quality.

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Fig. 10.
Fig. 10. Evolution of spectra versus the coupled power in the fiber (in log scale): evidence of the stimulated Raman scattering splitting and soliton self-frequency shift.

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Fig. 11.
Fig. 11. Pulse duration of compressed pulses after the prism-compressor and influence of the SRS splitting see also Fig.10.

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Fig. 12.
Fig. 12. Autocorrelation trace for Φ SPM ≈4π. The experimental trace shows 7 cycles at FWHM and the theory 3 cycles both are demonstrating important satellite pulses.

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Fig. 13.
Fig. 13. XFROG traces for incident pulse duration: the first column represents XFROG[Efiber,Einput] which puts the emphasis on the spectrum generation by SPM in the PCF fiber; the second column represents XFROG[Ecompressed,ETF] which puts the emphasis on the compression efficiency and the third column represents XFROG[Ecompressed,ETF]-XFROG[ETF,ETF] which puts the emphasis on the compressed-pulse quality.

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Fig. 14.
Fig. 14. Second pulse amplitude versus incident pulse duration for fixed compressed pulse durations Δτf ∈[15fs,20fs,30fs].

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Fig. 15.
Fig. 15. Time-bandwidth product at FWHM versus incident pulse duration for fixed compressed pulse durations Δτf ∈[15fs,20fs,30fs].

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Equations (4)

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Φ SPM = γ P 0 L
Δ ( f ( x ) , g ( x ) ) = 1 N ∑ i = 1 N ( f ( x i ) − g ( x i ) ) 2
XFROG [ E 1 , E 2 ] ( λ , τ ) = ∣ ∫ − ∞ ∞ E 1 ( t ) E 2 ( τ − t ) e − i 2 π ct λ dt ∣ 2
Φ SPM ( Δ τ i ) = γ L P ¯ F . Δ τ i ≈ a Δ τ f Δ τ i − a
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