Abstract

We demonstrate that the compensation of self-phase modulation by third-order dispersion can be exploited in the design of fiber amplifiers with tens of microjoules pulse energy. At the highest energies, the amplified pulse accumulates nonlinear phase shift as large as 17 π. Gain-narrowing occurs in the final amplifier stage, but shorter pulses are still generated with larger nonlinear phase shifts. A large-mode-area Yb-doped photonic crystal fiber amplifier generates diffraction-limited 30μJ pulses, which are compressed to 240fs duration. These are converted to the second harmonic with 48% conversion efficiency, as expected theoretically, which confirms the pulse quality.

© 2007 Optical Society of America

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References

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L. Kuznetsova, F. W. Wise, S. Kane, and J. Squier, Appl. Phys. B (in press) (2007).

A. Chong, L. Kuznetsova, and F. W. Wise, J. Opt. Soc. Am. B 24, 1815 (2007).
[CrossRef]

2006 (1)

2005 (3)

2004 (2)

2001 (1)

2000 (1)

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D. Strickland and G. Mourou, Opt. Commun. 56, 219 (1985).
[CrossRef]

1968 (1)

G. D. Boyd and D. A. Kleinman, J. Appl. Phys. 39, 3597 (1968).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Experimental setup. Inset, microscopic picture of LMA PCF.

Fig. 2
Fig. 2

Left, compressed FWHM pulse duration [T(exp)] measured in the experiment for the pulses out of the LMA PCF stage versus total accumulated Φ N L . Left inset, compressed FWHM pulse duration [T(theory)] versus total Φ N L from numerical simulations. Right, TL pulse duration (FWHM) of corresponding amplified spectra for the pulses out of the LMA PCF stage versus total accumulated Φ N L . Numbers indicate the Φ N L accumulated in LMA PCF stage. Right inset, ratio of the T(exp) and the TL pulse duration versus total Φ N L . Lines guide the eye.

Fig. 3
Fig. 3

Left, experimental spectra for the amplified pulses out of the preamplifier (dashed line) and LMA PCF amplifier (solid line) at 150 kHz . Right, interferometric and long range intensity (inset) AC for the 30 μ J pulses measured in the experiment after compression.

Fig. 4
Fig. 4

Left, 1 e 2 beam radius of the amplifier output beam at 30 μ J pulse energy versus distance z from the waist location. Points are measured data; line is the fit of beam radius ω to ω = ω 0 ( M 2 λ z ( ω 0 2 π ) + 1 ) 1 2 , where λ is the wavelength and ω 0 is waist radius. Right, temporal phase retrieved from the experimental SHG FROG trace for the pulses amplified to the indicated values of Φ N L and compressed.

Equations (1)

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E z + i β 2 2 2 E t 2 β 3 6 3 E t 3 i γ E 2 E = 1 4 π χ ( ω ) E ̃ ( z , ω ) exp ( i ω t ) d ω ,

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