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A 977-nm Yb fiber laser is calculated to have high efficiency when operating in the LP07 high-order mode of a large core diameter (43 mum) fiber, with Yb doped in a ring inside the core.
Efficient infrared 35-THz-wide parametric amplification with energies above 3 mJ is obtained in a 3-stage OPCPA using a combination of a 1030-nm 200-fs Yb- and a 1064-nm 60-ps Nd amplifier seeded with a common Yb oscillator.
Pulsed fiber laser spectral beam combining is demonstrated using spatial-dispersion-free approach based on 1nm-sharp spectral-edge filters. Three beams separated spectrally by ~2nm are combined with Gt90% efficiency yielding 52-W combined power and 1.9-mJ combined energy.
We demonstrated passive timing stabilization of mode-locked Ti:sapphire and Yb-fiber oscillators. The timing jitter of two femtosecond laser pulses was 3.2 fs from 10-kHz to 1-Hz integration.
Refractive index changes induced by pump-signal operation in commercial Yb-doped fibers are shown to be of electronic origin with a strong contribution of UV-transitions to the polarizability difference explored for testing wavelength of 1460-1620 nm.
We presents a compact diode pumped, Q-switched Yb doped rod-type fiber laser producing near diffraction limited frequency doubled and tripled beams with a conversion efficiency of respectively 62% and 38%.
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 spectrally broaden a low phase noise Yb-femtosecond similariton fiber oscillator to more than an octave bandwidth. Using the f-2f self-referencing scheme we detect and stabilize its carrier envelope offset frequency.
We report high-power operation of double-clad Yb-doped and Er,Yb-doped fiber lasers at 1066 nm and 1553 nm respectively using volume Bragg gratings for wavelength selection. Both lasers yielded output powers over 100 W limited by available pump power.
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 report experimental and numerical results on the pulse dynamic of passively modelocked Yb-doped fiber laser operating in the chirped-pulse regime. A newly design cavity with a CFBG provides positive dispersion with negligible nonlinearity.
An ytterbium fiber oscillator is demonstrated comprising a hollow-core photonic bandgap fiber fusion spliced to single-mode fibers in the cavity generating pulses of 4.1 nJ energy and pulse width of 210 fs.
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 the generation of ultra-short pulses with energies above 250 nJ from a self-starting mode-locked Ytterbium-doped large-mode-area rod-type fiber laser operating in the dispersion-compensation-free regime and discuss scaling possibilities beyond the muJ barrier.
We demonstrate threefold increased autocorrelation peak from an Yb-fiber CPA system operating with strong self-phase modulation by pre-shaping the pulse spectral-phase. The adaptive control loop used feedback from the output autocorrelation. High-quality 800 fs, 65 muJ recompressed pulses were produced.
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...
Femtosecond (~670 fs) fiber-CPA at 1.063 mum is demonstrated using broadband chirped-volume-Bragg-gratings for pulse stretching and compression. 32 W recompressed pulses are achieved corresponding to a 75% compression efficiency.
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.
Broadband THz generation is demonstrated using optical rectification in 6 mm GaP waveguides pumped by a high power, high repetition rate, ultrafast Yb-doped fiber amplifier. 150 muW THz radiation is obtained from 10 W pump power.
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