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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...

Public access from Aug 1, 2019
Université de Neuchâtel

Ultra-low noise microwave generation with a free-running optical frequency comb transfer oscillator

Brochard, Pierre ; Schilt, Stéphane ; Südmeyer, Thomas

In: Optics Letters, 2018, vol. 43, no. 19, p. 4651-4654

We present ultra-low noise microwave synthesis by optical to radio-frequency (RF) division realized with a free-running or RF-locked optical frequency comb (OFC) acting as a transfer oscillator. The method does not require any optical lock of the OFC and circumvents the need for a high-bandwidth actuator. Instead, the OFC phase noise is electrically removed from a beat-note signal with an optical...

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

Electrically-driven pure amplitude and frequency modulation in a quantum cascade laser

Shehzad, Atif ; Brochard, Pierre ; Matthey, Renaud ; Blaser, Stéphane ; Gresch, Tobias ; Maulini, Richard ; Muller, Antoine ; Südmeyer, Thomas ; Schilt, Stéphane

In: Optics Express, 2018, vol. 26, no. 9, p. 12306-12317

We present pure amplitude modulation (AM) and frequency modulation (FM) achieved electrically in a quantum cascade laser (QCL) equipped with an integrated resistive heater (IH). The QCL output power scales linearly with the current applied to the active region (AR), but decreases with the IH current, while the emission frequency decreases with both currents. Hence, a simultaneous modulation...

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

Frequency Noise Characterization of a 25-GHz Diode-Pumped Mode-Locked Laser With Indirect Carrier-Envelope Offset Noise Assessment

Brochard, Pierre ; Wittwer, Valentin Johannes ; Bilicki, Slawomir ; Resan, Bojan ; Weingarten, Kurt John ; Schilt, Stéphane ; Südmeyer, Thomas

In: IEEE Photonics Journal, 2018, vol. 10, no. 1, p. # 3200110

We present a detailed frequency noise characterization of an ultrafast diode-pumped solid-state laser operating at 25-GHz repetition rate. The laser is based on the gain material Er:Yb:glass and operates at a wavelength of 1.55 μm. Using a beating measure-ment with an ultralow-noise continuous-wave laser in combination with a dedicated electrical scheme, we measured the frequency noise...

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

All‑fiber versatile laser frequency reference at 2 μm for CO2 space‑borne lidar applications

Schilt, Stéphane ; Matthey, Renaud ; Hey Tow, Kenny ; Thévenaz, Luc ; Südmeyer, Thomas

In: CEAS Space Journal, 2017, vol. 9, no. 4, p. 493-505

We present a frequency stabilized laser at 2051 nm based on a versatile all-fibered stabilization setup. A modulation sideband locking technique is implemented to lock the laser at a controlled frequency detuning from the center of the CO2 R(30) transition envisaged for space-borne differential absorption lidar (DIAL) applications. This method relies on the use of a compact all-fibered...