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Université de Neuchâtel

Carrier-Envelope Offset Frequency Stabilization of a Thin-Disk Laser Oscillator via Depletion Modulation

Andrade, José R. C ; Modsching, Norbert ; Tajalli, Ayhan ; Dietrich, Christian M ; Kleinert, Sven ; Placzek, Fabian ; Kreipe, Bernhard ; Schilt, Stéphane ; Wittwer, Valentin J ; Südmeyer, Thomas ; Morgner, Uwe

In: IEEE Photonics Journal, 2020, vol. 12, no. 2, p. 1-9

We present a novel concept for the stabilization of the carrier-envelope offset (CEO) frequency of femtosecond pulse trains from thin-disk laser oscillators by exploiting gain depletion modulation in the active gain region. We shine a small fraction of the laser output power back onto the thin disk allowing the population inversion in the gain medium to be controlled. We employ this technique in...

Université de Neuchâtel

Frequency noise correlation between the offset frequency and the mode spacing in a mid-infrared quantum cascade laser frequency comb

Shehzad, Atif ; Brochard, Pierre ; Matthey, Renaud ; Kapsalidis, Filippos ; Shahmohammadi, Mehran ; Beck, Mattias ; Hugi, Andreas ; Jouy, Pierre ; Faist, Jérôme ; Südmeyer, Thomas ; Schilt, Stéphane

In: Optics Express, 2020, vol. 28, no. 6, p. 8200-8210

The generation of frequency combs in the mid-infrared (MIR) spectral range by quantum cascade lasers (QCLs) has the potential for revolutionizing dual-comb multi-heterodyne spectroscopy in the molecular fingerprint region. However, in contrast to frequency combs based on passively mode-locked ultrafast lasers, their operation relies on a completely different mechanism resulting from a four-wave...

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

10 kHz linewidth mid-infrared quantum cascade laser by stabilization to an optical delay line

Shehzad, Atif ; Brochard, Pierre ; Matthey, Renaud ; Südmeyer, Thomas ; Schilt, Stéphane

In: Optics Letters, 2019, vol. 44, no. 4, p. 3470-3473

We present a mid-infrared quantum cascade laser (QCL) with a sub-10 kHz full width at half-maximum linewidth (at 1 s integration time) achieved by stabilization to a free-space optical delay line. The linear range in the center of a fringe detected at the output of an imbalanced Mach–Zehnder interferometer implemented with a short free-space pathlength difference of only 1 m is used as a...

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

Broadband terahertz pulse generation driven by an ultrafast thin-disk laser oscillator

Clément, Paradis ; Drs, Jakub ; Modsching, Norbert ; Razskazovskaya, Olga ; Meyer, Frank ; Kränkel, Christian ; Saraceno, Clara J ; Wittwer, Valentin J ; Südmeyer, Thomas

In: Optics Express, 2018, vol. 26, no. 20, p. 26377-26384

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 a spectroscopic characterization of a GaP crystal...

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...