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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

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

Novel laser sources for metrology and spectroscopy

Gürel, Kutan ; Südmeyer, Thomas (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Lasers have revolutionized the photonics field as a coherent intense light source, capable of performing many tasks. They are widely used in industrial and medical applications, as well as for scientific research. Two important areas of applications are frequency metrology and spectroscopy. Quantum cascade lasers (QCL) cover a wide spectral region in the mid-infrared where most molecules exhibit...

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

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

Carrier envelope offset frequency detection and stabilization of a diode-pumped mode-locked Ti:sapphire laser

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

In: Optics Letters, 2017, vol. 42, no. 6, p. 1035-1038

We demonstrate the first diode-pumped Ti:sapphire laser frequency comb. It is pumped by two green laser diodes with a total pump power of 3 W. The Ti:sapphire laser generates 250 mW of average output power in 61-fs pulses at a repetition rate of 216 MHz. We generated an octave-spanning supercontinuum spectrum in a photonic-crystal fiber and detected the carrier envelope offset (CEO) frequency in...

Université de Neuchâtel

Frequency Tuning and Modulation of a Quantum Cascade Laser with an Integrated Resistive Heater

Gürel, Kutan ; Schilt, Stéphane ; Bismuto, Alfredo ; Bidaux, Yves ; Tardy, Camille ; Blaser, Stéphane ; Gresch, Tobias ; Südmeyer, Thomas

In: Photonics, 2016, vol. 3, no. 3, p. no 47

We present a detailed experimental investigation of the use of a novel actuator for frequency tuning and modulation in a quantum cascade laser (QCL) based on a resistive integrated heater (IH) placed close to the active region. This new actuator is attractive for molecular spectroscopy applications as it enables fast tuning of the QCL wavelength with a minor influence on the optical output power,...

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...