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...

Accès public à partir du 1 févr. 2019
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

Highly efficient Q-switched Yb:YAG channel waveguide laser with 5.6 W of average output power

Hakobyan, Sargis ; Wittwer, Valentin J ; Hasse, Kore ; Kränkel, Christian ; Südmeyer, Thomas. Laboratoire Temps-Fréquence, Université de Neuchâtel, Switzerland ; Calmano, Thomas

In: Optics Letters, 2016, vol. 41, no. 20, p. 4715-4718

In this Letter, we present high-power continuous wave (CW) and Q-switched femtosecond laser-written Yb:YAG channel waveguide lasers. In Q-switched operation, obtained by a semiconductor saturable absorber mirror (SESAM), as well as in CW operation, the laser generates average output powers of more than 5.6 W and reaches slope efficiencies above 74%. The Q-switched laser...

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

Carrier-envelope offset frequency stabilization of a gigahertz semiconductor disk laser

Jornod, Nayara ; Gürel, Kutan ; Wittwer, Valentin J ; Brochard, Pierre ; Hakobyan, Sargis ; Schilt, Stéphane ; Waldburger, Dominik ; Keller, Ursula ; Südmeyer, Thomas

In: Optica, 2017, vol. 4, no. 12, p. 1482-1487

Optical frequency combs based on ultrafast lasers have enabled numerous scientific breakthroughs. However, their use for commercial applications is limited by the complexity and cost of femtosecond laser technology. Ultrafast semiconductor lasers might change this issue as they can be mass produced in a cost-efficient way while providing large spectral coverage from a single technology. However,...

Université de Neuchâtel

Ultrafast optical parametric oscillator pumped by a vertical external-cavity surface-emitting laser (VECSEL)

Jornod, Nayara ; Wittwer, Valentin J ; Gaponenko, Maxim ; Hoffmann, Martin ; Hempler, Nils ; Malcolm, Graeme P. A ; Maker, Gareth T ; Südmeyer, Thomas

In: Optics Express, 2017, vol. 25, no. 23, p. 28983-28989

We report the first optical parametric oscillator synchronously pumped by a SESAM modelocked vertical external-cavity surface-emitting laser (VECSEL). As a nonlinear medium, we use a periodically poled MgO:PPLN crystal. The VECSEL operates at a wavelength of 982 nm and a repetition rate of 198 MHz. The pump radiation is converted to signal and idler wavelengths tunable in the ranges of 1.4-1.8...

Université de Neuchâtel

Carrier-envelope offset stabilization of a GHz repetition rate femtosecond laser using opto-optical modulation of a SESAM

Hakobyan, Sargis ; Wittwer, Valentin J ; Gürel, Kutan ; Mayer, Aline S ; Schilt, Stéphane ; Südmeyer, Thomas

In: Optics Letters, 2017, vol. 42, no. 22, p. 4651-4654

We demonstrate, to the best of our knowledge, the first carrier-envelope offset (CEO) frequency stabilization of a GHz femtosecond laser based on opto-optical modulation (OOM) of a semiconductor saturable absorber mirror (SESAM). The 1.05-GHz laser is based on a Yb:CALGO gain crystal and emits sub-100-fs pulses with 2.1-W average power at a center wavelength of 1055 nm. The SESAM plays two key...

Université de Neuchâtel

Full stabilization and characterization of an optical frequency comb from a diode-pumped solid-state laser with GHz repetition rate

Hakobyan, Sargis ; Wittwer, Valentin J ; Brochard, Pierre ; Gürel, Kutan ; Schilt, Stéphane ; Mayer, Aline S ; Keller, Ursula ; Südmeyer, Thomas

In: Optics Express, 2017, vol. 25, no. 17, p. 20437-20453

We demonstrate the first self-referenced full stabilization of a diode-pumped solid-state laser (DPSSL) frequency comb with a GHz repetition rate. The Yb:CALGO DPSSL delivers an average output power of up to 2.1 W with a typical pulse duration of 96 fs and a center wavelength of 1055 nm. A carrier-envelope offset (CEO) beat with a signal-to-noise ratio of 40 dB (in 10-kHz resolution bandwidth) is...

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...