Abstract
The temporal distribution of the spectral parametric gain was experimentally investigated when a chirped pump pulse was injected into a photonic crystal fiber. A pump-probe experiment was developed and the important characteristics were measured as the chirp of the pump, the signal pulse, and the gain of the parametric amplifier. We highlight that the amplified spectrum depends strongly on the instantaneous pump wavelength and that the temporal evolution of the wavelength at maximum gain is not monotonic. This behavior is significantly different from the case in which the chirped pump has a constant peak power. This measurement will be very important to efficiently include parametric amplifiers in laser systems delivering ultra-short pulses.
Highlights
Ultra-fast optical parametric amplification (OPA) has already demonstrated many interesting features relevant for the amplification of ultra-short pulses
We presented a pump-probe experiment enabling the characterization of the temporal distribution
We presented a pump-probe experiment enabling the characterization of the temporal of the spectral gain in a fiber-based optical parametric amplifier pumped by a chirped pump
Summary
Ultra-fast optical parametric amplification (OPA) has already demonstrated many interesting features relevant for the amplification of ultra-short pulses. It allows one to get a very high gain value and a very large gain bandwidth to amplify pulses with a duration as short as few optical cycles [1]. Ultra-fast four wave mixing in an optical fiber is a promising step towards the OPA of ultra-short pulses at high gain in a compact and rugged geometry [5,6]. In this case, the ultra-short signal has a very large bandwidth and is firstly stretched before the amplification to decrease the peak power and to limit spurious nonlinearities in the fiber. The signal is recompressed close to its initial pulse duration
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