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Higher-order-modes of a 70-mum core-diameter, Er-doped-fiber are characterized over a broad wavelength range using a supercontinuum with spatially and spectrally resolved imaging. Pumping the Er-doped-fiber with 1480-nm in the fundamental mode decreases the higher-order-mode content.
A passively mode-locked Er-fiber laser via nonlinear polarization rotation with fundamental repetition rate of 300 MHz is demonstrated. Frequency stabilization of the spectrum-broadened, octave-spanning laser comb and application to optical frequency measurement is reported.
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