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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.
We will discuss the status of high repetition rate high energy femtosecond fiber laser systems, review their scaling potential in terms of average power, pulse energy and peak power. First micro-machining applications demonstrate the potential of this laser technology.
We report on all-fiber coherent combining of 1.55 mum Er-doped single mode amplifiers achieved by means of active phase control that specifically employs the refractive index changes in Yb-doped fiber induced by 980 nm laser diode.
We report on an ytterbium-doped fiber CPA system delivering millijoule level pulse energy at repetition rates above 100 kHz corresponding to an average power of more than 100 W. The compressed pulses have a pulse duration of 800 fs. To our knowledge, this constitutes the highest pulse energy ever extracted from a fiber based femtosecond laser system and nearly two orders of magnitude higher repetition...
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 present theoretical modelling and experimental heterodyne measurements of spontaneous and stimulated Brillouin scattering gain spectra from a single-frequency ytterbium doped fiber amplifier system delivering 130 W of output power.
We propose and investigate a new beam combining setup using stimulated-Brillouin-scattering in a multimode gradient-index-fiber within a ring cavity. 50% efficiency and 99% slope are achieved with 2 ErYb doped fiber amplifiers without external control.
The energy transfer coefficients for Tb3+-Yb3+-codoped silicate glasses was obtained by a rate equation model. The proposed model can be used to understand the amplification properties in the 0.54 mum band under the 0.98 mum pumping.
The presented novel and rigorous analysis, which includes grating-assisted diffraction of amplified spontaneous emission generated along the entire grating structure, predicts accurately performance of the studied devices in terms of both the amplitude and phase.
We have demonstrated for the first time a cladding pumped C-band amplifier using high brightness in-band pump source at 1535 nm. Output power >10 W was obtained at 1565 nm with better than 40 dB OSNR.
Modal interference in few-moded large-core fiber amplifiers can yield output beams with good beam quality (M2~1.2 - 1.4) giving the impression of single-mode operation despite significant higher-order mode content. The implications for high-power devices are discussed.
We demonstrated a method of characterizing temperature sensitivity of ytterbium-doped fiber amplifiers based on deriving Stark parameters from measured emission and absorption spectra. Temperature sensitivity is found to be mainly determined by Pout/Ppump, when Pout/Ppump>0.4.
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