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Environmentally-stable femtosecond ytterbium fiber laser with birefringent photonic bandgap fiber

Hyungsik Lim, Andy Chong, and Frank W. Wise

Open Access Open Access

Abstract

We demonstrate an environmentally-stable mode-locked ytterbium fiber laser. The large birefringence of hollow-core photonic bandgap fiber allows it to control polarization in the laser while it provides the anomalous dispersion necessary for stretched-pulse operation. The laser generates 1-nJ pulses, which are dechirped to 70 fs.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Experimental configuration. FR, Faraday rotator, AOM, acousto-optical modulator, and WDM, wavelength-division multiplexer.

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Fig. 2.
Fig. 2. Left, dispersion (dashed) and attenuation (solid) spectra of the PBF (data supplied by Blazephotonics, Ltd). Right, the measured birefringence of the 3-m PBF.

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Fig. 3.
Fig. 3. Interferometric autocorrelation of a dechirped pulse from output 1, and the zero-phase Fourier transform of the measured power spectrum (gray line). Inset, pulse train.

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Fig. 4.
Fig. 4. Spectra of output 1 on logarithmic and linear scales, and of output 2, 3 on linear scales.

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