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Tunable optical combs spanning the 6.5-8.5 mum range are obtained as a result of a difference-frequency-generation process between pulse-trains emitted by an amplified 100 MHz Er-fiber oscillator with unprecedented average power of tens of microwatts.
20 muW of average power at ~18 mum is generated by difference frequency mixing the 300 mW, two-color output of a Yb:fiber amplifier. The mid-infrared power was not limited by two-photon absorption allowing it to be scaled.
We have developed a numerical simulation of cw-pumped Yb3+-doped fiber amplifiers seeded by pulses at 1064 nm. Results compare well to measurements of longitudinal upper-level ion populations and of output pulse energy versus pump power.
We report on a fiber CPA system producing 31 muJ energy pulses at a repetition rate of 1 MHz, with pulse duration of 220 fs, leading to a peak power up to 120 MW.
The optimum seed pulse-profile for a desired output pulse-profile in saturated ns-pulsed fiber-amplifiers is determined with an analytical solution for the amplification process. It can be regarded as an inverse Frantz-Nodvik-equation for the seed photon-density.
We report on direct amplification of femtosecond pulses in large-mode area fibers, where nonlinear effects dominate over dispersion. Careful compression allows the generation of muJ sub-80 fs pulses with good temporal pulse quality.
The influence of an erbium-doped fiber amplifier on the timing stability of an optical pulse train was characterized with balanced optical cross-correlation. Under optimized conditions, an added timing jitter of 0.5 fs was achieved.
We present optical ultrawideband doublet generation from NRZ-DPSK signals based on a length of SMF. The generated ultrawideband spectra using 25 km SMF and 15 km SMF are analyzed contrastively.
Broadband THz pulses have been generated from InGaN/GaN multiple quantum wells pumped by a frequency-doubled sub-picosecond laser amplifier at 395 nm. Enhanced THz emissions are strongly correlated with reduced photoluminescence intensities.
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