Public access from Nov 1, 2020
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

Frequency Comb Stabilization of Ultrafast Lasers by Opto-Optical Modulation of Semiconductors

Gürel, Kutan ; Hakobyan, Sargis ; Wittwer, Valentin Johannes ; Schilt, Stéphane ; Südmeyer, Thomas

In: IEEE Journal of Selected Topics in Quantum Electronics, 2018, vol. 24, no. 5, p. # 1102309

In this paper, we review the current state and discuss new developments in opto-optical modulation (OOM) of semiconductor elements for frequency comb self-referenced stabilization of ultrafast lasers. This method has been successfully used for carrier-envelope offset (CEO) frequency stabilization of diodepumped solid-state lasers operating in 1-μm and 1.5-μm regimes, providing...

Université de Neuchâtel

Frequency Noise Characterization of a 25-GHz Diode-Pumped Mode-Locked Laser With Indirect Carrier-Envelope Offset Noise Assessment

Brochard, Pierre ; Wittwer, Valentin Johannes ; Bilicki, Slawomir ; Resan, Bojan ; Weingarten, Kurt John ; Schilt, Stéphane ; Südmeyer, Thomas

In: IEEE Photonics Journal, 2018, vol. 10, no. 1, p. # 3200110

We present a detailed frequency noise characterization of an ultrafast diode-pumped solid-state laser operating at 25-GHz repetition rate. The laser is based on the gain material Er:Yb:glass and operates at a wavelength of 1.55 μm. Using a beating measure-ment with an ultralow-noise continuous-wave laser in combination with a dedicated electrical scheme, we measured the frequency noise...