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We propose an innovative, fully space–time model to take into account the seed-dependent nature of ageing penalties in high-power ytterbium-doped fibre amplifiers. Ageing is shown to be based on the on-going competition between photo-darkening and photo-bleaching phenomena. Our approach is based on the natural interplay between the excited states of co-existing ytterbium pairs and colour centres in...
Energy scaling of ultrafast Yb-doped fiber oscillators has experienced rapid progress largely driven by many applications that require high average power femtosecond pulses. The fundamental challenge for ultrafast fiber lasers relies on the control of excessive nonlinearity, which limits pulse energy. The development of all-normal dispersion laser cavities based on large-mode-area photonic crystal...
We report on a passively mode-locked fiber laser emitting around 976 nm. The laser emits chirped pulses with a duration of 1.02 ps and 12 nJ at 40,7 MHz. External compression leads to pulses as short as 286 fs.
We study the impact of the mode-locking mechanism on the performances of a microjoule-class all-normal dispersion fiber laser featuring large-mode-area photonic crystal fibers.
We report on a high-energy mode-locked fiber laser emitting chirped pulses of 1 ps and 12 nJ at 976 nm at a repetition rate of 40,7 MHz. Pulses are externally recompressed down to 286 fs. Frequency conversion to 488 nm and 325 nm are discussed.
In order to carry out applications with single attosecond pulses isolated by controlling the carrier-envelop-phase (CEP) of the driving field in a reasonable time, the need of CEP-stabilized laser sources, currently based on Ti:sapphire, delivering pulses with both high peak and average power will increase in the next few years. The development of two technologies e.g. non-collinear optical parametric...
We report on a fiber CPA system producing 100 muJ energy pulses with quasi transform limited duration of 267 fs at a repetition rate of 300 kHz leading to a peak power of 345 MW.
We report on the direct seeding of a 7-fs Ti:sapphire oscillator into a fiber amplifier at 100-kHz repetition rate used for pumping a NOPA. 1-muJ pulses have been then recompressed down to 15-fs.
We demonstrate high brightness XUV emission through high order harmonic generation driven by a 100 muJ-class ytterbium-doped fiber, CPA system at controllable ultrahigh (100 kHz to 1 MHz) repetition rate.
We report on a fiber CPA system producing 31μJ energy pulses at a repetition rate of 1MHz, with pulse duration of 220fs, leading to a peak power up to 120MW.
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.
We study the temporal behaviour of photodarkening in an Yb-doped large-mode-area (LMA) fiber and show photobleaching of the same fiber. The absorption spectra and the influence on the lasing properties when this fiber is used in a CW laser oscillator.
We study the limitation in energy storage of LMA Yb-doped fibers and show the importance of the gain recovery time for high power nanosecond laser and amplifier design.
We studied the temporal behaviour of photodarkening in an Yb-doped LMA fiber and show photobleaching of the same fiber. The absorption spectra and the influence on the lasing properties are shown.
We studied the temporal behaviour of photodarkening in an Yb-doped LMA fiber and show photobleaching of the same fiber. The absorption spectra and the influence on the lasing properties are shown.
We report a tunable laser source emitting in the visible (530 nm, 630 nm) and the near infrared (775 nm, 1060 nm, and 1550 nm) regions by frequency summation of a dual wavelength Er/Yb co-doped fiber laser.
We report on an Yb doped dual concentric core fiber laser. Phase locking of the two concentric cores radiations is performed at the laser output to achieve single-mode emission of the central core.
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