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Université de Neuchâtel

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

Drs, Jakub ; Modsching, Norbert ; Paradis, Clément ; Kränkel, Christian ; Wittwer, Valentin Johannes ; Razskazovskaya, Olga ; Südmeyer, Thomas

In: Journal of the Optical Society of America B, 2019, vol. 36, no. 11, p. 3039-3045

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 parameters with respect to the broadest spectral...

Université de Neuchâtel

XUV Sources Based on Intra-Oscillator High Harmonic Generation with Thin-Disk Lasers: Current Status and Prospects

Labaye, François ; Gaponenko, Maxim ; Modsching, Norbert ; Brochard, Pierre ; Paradis, Clément ; Schilt, Stéphane ; Wittwer, Valentin Johannes ; Südmeyer, Thomas

In: IEEE Journal of Selected Topics in Quantum Electronics, 2019, vol. 25, no. 4, p. # 8800619

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 a very recent approach for the generation of...

Université de Neuchâtel

Sub-100-fs Kerr lens mode-locked Yb:Lu2O3 thin-disk laser oscillator operating at 21 W average power

Modsching, Norbert ; Drs, Jakub ; Fischer, Julien ; Paradis, Clément ; Labaye, François ; Gaponenko, Maxim ; Kränkel, Christian ; Wittwer, Valentin J ; Südmeyer, Thomas

In: Optics Express, 2019, vol. 27, no. 11, p. 16111-16120

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 efficiency by a factor of...

Université de Neuchâtel

Carrier-envelope offset frequency stabilization of a thin-disk laser oscillator operating in the strongly self-phase modulation broadened regime

Modsching, Norbert ; Paradis, Clément ; Brochard, Pierre ; Jornod, Nayara ; Gürel, Kutan ; Kränkel, Christian ; Schilt, Stéphane ; Wittwer, Valentin J ; Südmeyer, Thomas

In: Optics Express, 2018, vol. 26, no. 22, p. 28461-28468

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 with very high output...

Université de Neuchâtel

Kerr lens mode-locked Yb:CALGO thin-disk laser

Modsching, Norbert ; Paradis, Clément ; Labaye, François ; Gaponenko, Maxim ; Graumann, Ivan J ; Diebold, Andreas ; Emaury, Florian ; Wittwer, Valentin J ; Südmeyer, Thomas

In: Optics Letters, 2018, vol. 43, no. 4, p. 879-882

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 bulk oscillators. The average output...

Université de Neuchâtel

Novel ultrafast high-power thin-disk laser oscillators and applications for metrology and XUV generation

Paradis, Clément ; Südmeyer, Thomas (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Ultrafast lasers have revolutionized research in fundamental physics, chemistry and biology as well as industrial applications. A great number of experiments benefit from the development of Yb-based high-power femtosecond laser sources. These systems typically include a low-power mode-locked oscillator followed by amplifier stages relying on fiber, slab or thin-disk technologies. In many cases,...

Université de Neuchâtel

Extreme ultraviolet light source at a megahertz repetition rate based on high-harmonic generation inside a mode-locked thin-disk laser oscillator

Labaye, François ; Gaponenko, Maxim ; Wittwer, Valentin J ; Diebold, A ; Paradis, Clément ; Modsching, Norbert Paul ; Merceron, Loïc ; Emaury, F ; Graumann, I.J ; Phillips, C.R ; Saraceno, C.J ; Kränkel, C ; Keller, Ursula ; Südmeyer, Thomas

In: Optics Letters, 2017, vol. 42, no. 24, p. 5170-5173

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 jet with an intracavity peak intensity of...

Université de Neuchâtel

Generation of 35-fs pulses from a Kerr lens mode-locked Yb:Lu2O3 thin-disk laser

Paradis, Clément ; Modsching, Norbert ; Wittwer, Valentin J ; Deppe, Bastian ; Kränkel, Christian ; Südmeyer, Thomas

In: Optics Express, 2017, vol. 25, no. 13, p. 14918-14925

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 corresponding emission band...