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

Green-diode-pumped femtosecond Ti:Sapphire laser with up to 450 mW average power

Gürel, Kutan ; Wittwer, Valentin J ; Hoffmann, Martin ; Saraceno, Clara J ; Hakobyan, Sargis ; Resan, B ; Rohrbacher, A ; Weingarten, K ; Schilt, Stéphane ; Südmeyer, Thomas

In: Optics Express, 2015, vol. 23, no. 23, p. 30043-30048

We investigate power-scaling of green-diode-pumped Ti:Sapphire lasers in continuous-wave (CW) and mode-locked operation. In a first configuration with a total pump power of up to 2 W incident onto the crystal, we achieved a CW power of up to 440 mW and self-starting mode-locking with up to 200 mW average power in 68-fs pulses using semiconductor saturable absorber mirror (SESAM) as saturable...

Université de Neuchâtel

Frequency comb offset dynamics of SESAM modelocked thin disk lasers

Emaury, Florian ; Diebold, Andreas ; Klenner, Alexander ; Saraceno, Clara J ; Schilt, Stéphane ; Südmeyer, Thomas ; Keller, Ursula

In: Optics Express, 2015, vol. 23, no. 17, p. 21836-21856

We present a detailed study of the carrier-envelope offset (CEO) frequency dynamics of SESAM modelocked thin disk lasers (TDLs) pumped by kW-class highly transverse multimode pump diodes with a typical M2 value of 200-300, and give guidelines for future frequency stabilization of multi-100-W oscillators. We demonstrate CEO frequency detection with > 30 dB signal-to-noise ratio...

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

SESAM mode-locked Yb:CaGdAlO4 thin disk laser with 62 fs pulse generation

Diebold, Andreas ; Emaury, Florian ; Schriber, Cinia ; Golling, Matthias ; Saraceno, Clara J ; Südmeyer, Thomas ; Keller, Ursula

In: Optics Letters, 2013, vol. 39, no. 19, p. 3842-3845

We present a semiconductor saturable absorber mirror (SESAM) mode-locked thin disk laser (TDL) based on Yb:CaGdAlO4 (Yb:CALGO) generating 62 fs pulses, which is the shortest pulse duration achieved from mode-locked TDLs to date. The oscillator operates at a repetition rate of 65 MHz and delivers 5.1 W of average output power. The short pulse duration of our TDL in combination with the...

Université de Neuchâtel

275 W average output power from a femtosecond thin disk oscillator operated in a vacuum environment

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

In: Optics Express, 2012, vol. 20, no. 21, p. 23535-23541

We present an ultrafast thin disk laser that generates an average output power of 275 W, which is higher than any other modelocked laser oscillator. It is based on the gain material Yb:YAG and operates at a pulse duration of 583 fs and a repetition rate of 16.3 MHz resulting in a pulse energy of 16.9 µJ and a peak power of 25.6 MW. A SESAM designed for high damage threshold initiated and...

Université de Neuchâtel

Ultrafast thin-disk laser with 80 µJ pulse energy and 242 W of average power

Saraceno, Clara J ; Emaury, Florian ; Schriber, Cinia ; Hoffmann, Martin ; Golling, Matthias ; Südmeyer, Thomas ; Keller, Ursula

In: Optics Letters, 2014, vol. 39, no. 1, p. 9-12

We present a semiconductor saturable absorber mirror (SESAM) mode-locked thin-disk laser generating 80 µJ of pulse energy without additional amplification. This laser oscillator operates at a repetition rate of 3.03 MHz and delivers up to 242 W of average output power with a pulse duration of 1.07 ps, resulting in an output peak power of 66 MW. In order to minimize the parasitic nonlinearity of...