A5101886342- Photonic Crystal and Fiber Optics
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Laser-Matter Interactions and Applications
- Photonic and Optical Devices
- Solid State Laser Technologies
Technical University of Denmark
2019-2022
NKT Holding (Denmark)
2021
Ørsted (Denmark)
2019
Foton Motors (China)
2018
Spectral broadening of optical frequency combs with high repetition rate is significant interest in communications, radio-frequency photonics and spectroscopy. Silicon nitride waveguides (Si3N4) the anomalous dispersion region have shown efficient supercontinuum generation spanning an octave-bandwidth. However, mechanism this regime usually attained femtosecond pulses order to maintain coherence. Supercontinuum normal more prone longer (ps) pulses, but implementation silicon challenging as...
We report the performance of an LMA Yb-doped fiber, designed for increasing transverse mode instability threshold and minimizing nonlinear effects in multi-kilowatt class fiber lasers, by reducing thermo-optic coefficient core, compared with that standard aluminophosphosilicate fibers. A TMI-free 5.2 kW single-mode output power from a Yb 20/400 17.5 μm mode-field diameter was achieved broad bandwidth, co-pumped amplifier 78% optical-to-optical efficiency, while 4 signal attained 26 GHz...
In this paper we numerically study supercontinuum generation by pumping a silicon nitride waveguide, with two zero-dispersion wavelengths, femtosecond pulses. The waveguide dispersion is designed so that the pump pulse in normal-dispersion regime. We show because of self-phase modulation, initial broadens into anomalous-dispersion regime, which sandwiched between regimes, and here soliton formed. interaction broadened regime causes additional spectral broadening through formation dispersive...
Single-pass amplification using rod-type fibers has become a common route to pulsed laser sources around 1030 nm with high average and peak power. Average-power scaling is currently limited by the dynamic thermo-optic phenomenon of “transverse mode instability.” In comparison, double-pass amplifier configurations have not been extensively studied. Recent theoretical experimental work shown both static degradation phenomena, including an unexpected nonlinear polarization rotation effect. Here...
Directional supercontinuum is generated in a silicon-rich nitride waveguide with two zero dispersion wavelengths. The caused by interaction between soliton and pulse the normal regime leading to dispersive waves.
In this work we investigate transverse mode instability (TMI) in the presence of pump intensity noise and a controlled perturbation input coupling for rod-type fiber amplifier using spatially temporally resolved imaging (ST). We show that inherent from power supply can define significant peaks resulting TMI spectrum. ST measurements transition region also indicates simple picture being seeded by combination static initial fraction LP11 or signal is not valid our measurements. Furthermore,...
Dispersion-engineered silicon nitride waveguides are often used for broadening of frequency combs. Previous experiments have focused on anomalous dispersion pumped by femtosecond laser pulses, whereby coherent supercontinuum generation relies soliton compression and dispersive wave emission (see e.g. [1] ). This regime operation does not work well with high-repetition rate sources, such as microcombs or electro-optic (EO) combs, because the pulse duration is sufficiently short to drive in...