Clément Paradis

Amphos · Scientific Laser Systems

We developed a high transmission Hollow-core fiber (HCF) with 1mm ID that supports 97% absolute transmission. We were able to achieve about 30 times spectral broadening of 11mJ, 1.5ps pulses from a 275W, 25 kHz InnoSlab multi-pass amplifier with 90% fiber transmission. The spectrum achieved with Kr at 1 bar supports a 50fs TL bandwidth.

We demonstrate broadband high-power terahertz (THz) generation at megahertz repetition rates by optical rectification in GaP driven by an ultrafast Yb-based thin-disk laser (TDL) oscillator. We investigate the influence of pulse duration in the range of 50–220 fs and thickness of the GaP crystal on the THz generation. Optimization of these paramete...

Ultrafast thin-disk laser (TDL) oscillators provide higher intracavity pulse energy, average power, and peak power levels than any other femtosecond laser oscillator technology. They are suitable for driving extreme nonlinear interactions directly inside the laser oscillator. High harmonic generation (HHG) driven inside ultrafast TDL oscillators is...

We investigate power-scaling of a Kerr lens mode-locked (KLM) Yb:Lu2O3 thin-disk laser (TDL) oscillator operating in the sub-100-fs pulse duration regime. Employing a scheme with higher round-trip gain by increasing the number of passes through the thin-disk gain element, we increase the average power by a factor of two and the optical-to-optical e...

We confirm the high suitability of ultrafast thin-disk lasers for THz generation, achieving up to 0.33-mW broadband THz radiation in GaP. Moreover, we show 7-THz gapless spectrum by optimization of crystal length and pulse duration.

We demonstrate a Kerr lens mode-locked thin-disk laser oscillator operating with 95-fs pulses at 21.1 W of average power. This is the highest average power achieved by any oscillator in the sub-100-fs regime.

We demonstrate the carrier-envelope offset (CEO) frequency stabilization of a Kerr lens mode-locked Yb:Lu2O3 thin-disk laser oscillator operating in the strongly self-phase modulation (SPM) broadened regime. This novel approach allows overcoming the intrinsic gain bandwidth limit and is suited to support frequency combs from sub-100-fs pulse trains...

We demonstrate broadband THz generation driven by an ultrafast thin-disk laser (TDL) oscillator. By optical rectification of 50-fs pulses at 61 MHz repetition rate in a collinear geometry in crystalline GaP, THz radiation with a central frequency at around 3.4 THz and a spectrum extending from below 1 THz to nearly 7 THz are generated. We realized...

We present a proof-of-principle demonstration of THz generation using a short-pulse, mode-locked thin-disk laser (TDL) oscillator as driving source. The diode-pumped Yb:Lu2O3 TDL oscillator, delivering 4 W average power in 50-fs pulses at 61-MHz pulse repetition rate, generates broadband THz radiation (up to 3.5 THz) in GaP.

We demonstrate the first Kerr lens mode-locked Yb:CaGdAlO4(Yb:CALGO) thin-disk laser oscillator. It generates pulses with a duration of 30 fs at a central wavelength of 1048 nm and a repetition rate of 124 MHz. The laser emits the shortest pulses generated by a thin-disk laser oscillator, equal to the shortest pulse duration obtained by Yb-doped bu...

Ultrafast thin-disk lasers continue achieving higher average powers and pulse energies than other oscillator technologies. We discuss performance scaling and the ongoing race towards shorter pulse durations, which recently resulted in 30-fs from Yb-based thin-disk lasers.

An Yb:LuO thin-disk laser generating 50-fs pulses at 4-W average output power and 50-MW intracavity peak power is CEO stabilized with 200-mrad integrated phase noise. Effects of repetition-rate stabilization onto the CEO noise are discussed.

We demonstrate a compact XUV source based on intracavity high-harmonic generation driven inside a modelocked thin-disk laser oscillator, generating photons with energy up to 20.4 eV (17th harmonics) at a repetition rate of 17.35 MHz.

We demonstrate a compact extreme ultraviolet (XUV) source based on high-harmonic generation (HHG) driven directly inside the cavity of a mode-locked thin-disk laser oscillator. The laser is directly diode-pumped at a power of only 51 W and operates at a wavelength of 1034 nm and a 17.35 MHz repetition rate. We drive HHG in a high-pressure xenon gas...

In this work, recent achievements in the field of ultrafast thin-disk lasers (TDLs) are discussed. The novel ultrafast Yb-based TDL oscillators presented in this thesis show improved performance at sub 100 fs pulse duration. Benefiting from the fruitful combination of the Kerr lens mode locking scheme and the broad emission of the gain materials, T...

We demonstrate HHG inside a modelocked thin-disk laser. Diode-pumped at only 48 W, it drives HHG in xenon at 2.6×1013 W/cm2 and 300 W average power, generating XUV-light down to 60.7-nm at 17-MHz repetition rate.

So far, ultrafast Yb-based laser oscillators achieved shorter pulses in bulk than in thin-disk geometry. We present Kerr lens mode-locked thin-disk lasers delivering record-short pulses, achieving 40 fs from Yb:Lu2O3 and 30 fs from Yb:CALGO.

We investigate Kerr lens mode locking of Yb:Lu2O3 thin-disk laser oscillators operating in the sub-100-fs regime. Pulses as short as 35 fs were generated at an average output power of 1.6 W. These are the shortest pulses directly emitted from a thin-disk laser oscillator. The optical spectrum of the 35-fs pulses is almost 3 times broader than the c...

We present the optimization of laser key parameters in a Kerr-Lens modelocked Yb:LuO thin-disk laser oscillator, resulting in a more than twice shorter pulse duration than ever demonstrated before for Yb:LuO in the thin-disk configuration.

We discuss different configurations of KLM thin-disk lasers based on Yb:LuO. We achieve shorter pulses than previously demonstrated for this gain material in the thin-disk configuration and up to 11.0 W in 184-fs pulses.

We demonstrate a compact coherent XUV source based on intracavity high harmonic generation inside a modelocked thin-disk laser, generating photons with energy up to 20.4 eV (17th harmonics) at a repetition rate of 17.4 MHz.

We evaluate limitations in pulse duration for Kerr-lens mode-locked Yb-based thin-disk lasers. The most critical factor is appropriate intracavity dispersion engineering, which enabled operation at 30-fs. Substantially shorter durations are within reach using new designs.