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(a) Schematic representation of the mode-locked fiber laser and amplifier setup used in this work. (b) Simulation of the band structure with energy levels of the quantized states 1, 2, and 3 showing nearly equal spacing.
Autocorrelation trace of a laser pulse at showing a full width at half maximum of . The inset shows wavelength vs pump power curves of the laser output behind the Raman photonic crystal fiber wavelength shifter.
Optical response of the detector at and as a function of polarization angle . The nonlinearity of the detector clearly distorts the expected cosine curve. The red line is a fit to the curve according to the function . The angles at integer multiples of 90° correspond to TE polarization, where the detector response is supposed to be weak.
High-frequency response of the -based detector as measured using the ultrashort pulses from the Raman shifted mode-locked fiber laser. The blue line was obtained with a broadband amplifier whereas the red line corresponds to a measurement using both low noise and broadband amplifier (both for radiation). The black curve corresponds to the response to the radiation. Dashed lines are guides for the eye.
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