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

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

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...

Université de Neuchâtel

High-power amplification of a femtosecond vertical external-cavity surface-emitting laser in an Yb : YAG waveguide

Jornod, Nayara ; Wittwer, Valentin J ; Kränkel, Christian ; Waldburger, Dominik ; Keller, Ursula ; Südmeyer, Thomas ; Calmano, Thomas

In: Optics Express, 2017, vol. 25, no. 14, p. 16527-16533

We present the amplification of a mode-locked vertical external-cavity surfaceemitting laser (VECSEL) using an Yb:YAG crystalline waveguide as gain medium. The VECSEL seed laser operates at a center wavelength of 1030 nm and generates 300-fs pulses at a repetition rate of 1.77 GHz. An average seed power of 60 mW was launched onto a 8.3 mm long fs-laser written Yb:YAG waveguide pumped by 7.7 W...

Université de Neuchâtel

Cutting-Edge High-Power Ultrafast Thin Disk Oscillators

Saraceno, Clara J ; Schriber, Cinia ; Emaury, Florian ; Heckl, Oliver H ; Baer, Cyrill R. E ; Hoffmann, Martin ; Beil, Kolja ; Kränkel, Christian ; Golling, Matthias ; Südmeyer, Thomas ; Keller, Ursula

In: Applied Science, 2013, vol. 3, no. 2, p. 355-395

A growing number of applications in science and industry are currently pushing the development of ultrafast laser technologies that enable high average powers. SESAM modelocked thin disk lasers (TDLs) currently achieve higher pulse energies and average powers than any other ultrafast oscillator technology, making them excellent candidates in this goal. Recently, 275 W of average power with a...

Université de Neuchâtel

Yb-doped mixed sesquioxides for ultrashort pulse generation in the thin disk laser setup

Beil, Kolja ; Saraceno, Clara J ; Schriber, Cinia ; Emaury, Florian ; Heckl, Oliver H ; Baer, Cyrill R. E ; Golling, Matthias ; Südmeyer, Thomas ; Keller, Ursula ; Kränkel, Christian ; Huber, Günter

In: Applied Physics B, 2013, vol. 113, no. 1, p. 13-18

We report on spectroscopic investigations of the mixed sesquioxide laser materials Yb:LuScO3, Yb:YScO3, and Yb:(Lu,Y,Sc)2O3 as well as mode-locked thin disk laser experiments with Yb:LuScO3 and Yb:(Lu,Y,Sc)2O3. The disordered crystal structures of these materials result in significantly broader emission spectra than for...

Université de Neuchâtel

Sub-100 femtosecond pulses from a SESAM modelocked thin disk laser

Saraceno, Clara J ; Heckl, Oliver H ; Baer, Cyrill R. E ; Schriber, Cinia ; Golling, Matthias ; Beil, Kolja ; Kränkel, Christian ; Südmeyer, Thomas ; Huber, Günter ; Keller, Ursula

In: Applied Physics B, 2012, vol. 106, no. 3, p. 559-562

We present the first passively modelocked thin disk laser (TDL) with sub-100-fs pulse duration using the broadband sesquioxide gain material Yb:LuScO3 and an optimized SEmiconductor Saturable Absorber Mirror (SESAM). In this proof-of-principle experiment, we obtained 5.1 W of average power at a repetition rate of 77.5 MHz and a pulse duration of 96 fs. We carefully explored and...

Université de Neuchâtel

Self-referenceable frequency comb from an ultrafast thin disk laser

Saraceno, Clara J ; Pekarek, Selina ; Heckl, Oliver H ; Baer, Cyrill R. E ; Schriber, Cinia ; Golling, Matthias ; Beil, Kolja ; Kränkel, Christian ; Huber, Günter ; Keller, Ursula ; Südmeyer, Thomas

In: Optics Express, 2012, vol. 20, no. 9, p. 9650-9656

We present the first measurement of the carrier envelope offset (CEO) frequency of an ultrafast thin disk laser (TDL). The TDL used for this proof-of-principle experiment was based on the gain material Yb:Lu2O3 and delivered 7 W of average power in 142-fs pulses, which is more than two times shorter than previously realized with this material. Using only 65 mW of the output...

Université de Neuchâtel

Frontiers in passively modelocked thin disk laser oscillators

Baer, Cyrill R. E ; Heckl, Olivier H ; Saraceno, Clara J ; Schriber, Cinia ; Kränkel, Christian ; Südmeyer, Thomas ; Keller, Ursula

In: Optics Express, 2012, vol. 20, no. 7, p. 7054-7065

Semiconductor saturable absorber mirror (SESAM) mode-locked thin disk lasers define the state-of-the-art performance for high average power and high pulse energy femtosecond laser oscillators. To date pulse energies above 30 µJ and average powers above 140 W have been demonstrated. In this paper we review the achievements of mode-locked thin disk lasers in terms of average power and pulse...