Abstract

We demonstrate generation of 48fs pulses with linear chirp using a short (27mm) fiber optical parametric oscillator (FOPO), which is synchronously pumped by a mode-locked ytterbium-doped fiber laser. We also study the pulse quality for both the short- and long-wavelength operation where the fiber length inside of the oscillator varies from 17 to 61mm. The optimal pulse duration is observed only in the short-wavelength operation. Furthermore, we model the FOPO system as a single-pass parametric amplifier including dispersive pulse broadening and walk-off between the pump and output. The optimal condition arises from the minimization of the walk-off and dispersion. When walk-off is large, the parametric amplification process is most efficient over some reduced effective fiber length, leading to an upper limit in the amount of the observed pulse broadening.

© 2010 Optical Society of America

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[CrossRef]

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[CrossRef]

J. Lightwave Technol.

J. Opt. Soc. Am. B

Opt. Express

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Opt. Photon. News

M. E. Marhic, K.-K. Wong, G. Kalogerakis, and L. G. Kazovsky, Opt. Photon. News 15(9), 20 (2004).
[CrossRef]

Other

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Figures (5)

Fig. 1
Fig. 1

FOPO setup utilizing a short PCF within a Fabry–Perot cavity.

Fig. 2
Fig. 2

(a) Measured group velocity delay and inferred group-velocity dispersion of the PCF used in these experiments. (b) SEM image of the PCF.

Fig. 3
Fig. 3

Experimental measurements of the output of the FOPO for a 27-mm-long PCF. (a) Measured FROG spectrogram. (b) Retrieved temporal amplitude (solid curve) and phase (dashed curve).

Fig. 4
Fig. 4

Measured spectra for both sidebands at high and low pump power for a 33-mm-long PCF. Curves for 1 W have been vertically offset for clarity.

Fig. 5
Fig. 5

Pulse duration as a function of fiber length at both output wavelength ranges. Markers are the experimental results, and dashed curves are theoretical predictions. Inset, plot of the corresponding peak output wavelengths as a function of fiber length.

Equations (1)

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τ effective = 2 T p 1 2 ln ( 1 ln 2 2 γ P 0 L ) ,

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