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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

New frontiers of ultrafast thin-disk laser oscillators for applications in metrology and the generation of THz and XUV radiation

Modsching, Norbert Paul ; Südmeyer, Thomas (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2019.

Ultrafast laser systems find application as versatile tool in industry and science. Ultrafast laser systems based on Ti:sapphire – the workhorse in ultrafast science – operate typically at kHz repetition rates and benefit from the available broad gain bandwidth for the direct generation of sub 100-fs pulse durations. However, thermal effects in the gain medium due to a high quantum defect...

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

Carrier-Envelope Offset Frequency Stabilization of a Fiber Laser by Cross Gain Modulation

Gürel, Kutan ; Schilt, Stéphane ; Südmeyer, Thomas

In: IEEE Photonics Journal, 2018, vol. 10, no. 2, p. # 3200306

We present the first carrier-envelope offset (CEO) frequency stabilization of a fiber laser by cross gain modulation. The Yb-doped fiber laser is mode-locked by nonlinear polarization evolution and emits 32-nm wide dissipative solitons at a repetition rate of 125 MHz with 150 mW of average output power. A continuous wave laser signal at a wavelength of 1025 nm is used as an intracavity power...

Université de Neuchâtel

Self-induced transparency and coherent population trapping of 87Rb vapor in a mode-locked laser

Masuda, Koji ; Affolderbach, Christoph ; Mileti, Gaetano ; Diels, Jean-Claude ; Arissian, Ladan

In: Optics Letters, 2015, vol. 40, no. 9, p. 2146-2149

Simultaneous self-induced transparency and a dark line resonance are observed inside a mode-locked laser. The circulating pulse, tuned to the 795-nm optical resonance of rubidium, has sufficient intensity to create at each passage a population inversion—return to ground state, typical of self-induced transparency. A drop in fluorescence (dark line resonance), is observed as the...