Picosecond pulses at 1.56µmm wavelength are directly amplified with a diffraction limited beam quality in a core-pumped Er fiber with an 875µm2 effective area. The interplay between nonlinear spectral broadening and anomalous fiber dispersion compresses the input pulse duration during amplification so that 42 nJ energy pulses with ~65 kW peak power are achieved without pulse break-up.
© 2007 Optical Society of America
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