Accès public à partir du 1 août 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

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

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...

Accès public à partir du 15 nov. 2018
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

Power Spectrum Computation for an Arbitrary Phase Noise Using Middleton’s Convolution Series : Implementation Guideline and Experimental Illustration

Brochard, Pierre ; Südmeyer, Thomas ; Schilt, Stéphane

In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2017, vol. 64, no. 11, p. 1766-1775

In this paper, we revisit the convolution series initially introduced by Middleton several decades ago to determine the power spectrum (or spectral line shape) of a periodic signal from its phase noise power spectral density. This topic is of wide interest, as it has an important impact on many scientific areas that involve lasers and oscillators. We introduce a simple guideline that enables a...

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

Rb-stabilized laser at 1572 nm for CO2 monitoring

Matthey, Renaud ; Moreno, William ; Gruet, Florian ; Brochard, Pierre ; Schilt, Stéphane ; Mileti, Gaetano

In: Journal of Physics: Conference Series, 2016, vol. 723, no. 1, p. 012034

We have developed a compact rubidium-stabilized laser system to serve as optical frequency reference in the 1.55-μm wavelength region, in particular for CO2 monitoring at 1572 nm. The light of a fiber-pigtailed distributed feedback (DFB) laser emitting at 1560 nm is frequency-doubled and locked to a sub-Doppler rubidium transition at 780 nm using a 2-cm long vapor glass cell. Part of...

Université de Neuchâtel

First investigation of the noise and modulation properties of the carrier-envelope offset in a modelocked semiconductor laser

Brochard, Pierre ; Jornod, Nayara ; Schilt, Stéphane ; Wittwer, Valentin J ; Hakobyan, Sargis ; Waldburger, Dominik ; Link, Sandro M ; Alfieri, Cesare G. E ; Golling, Matthias ; Devenoges, Laurent ; Morel, Jacques ; Keller, Ursula ; Südmeyer, Thomas. Laboratoire Temps-Fréquence, Université de Neuchâtel, Switzerland

In: Optics Letters, 2016, vol. 41, no. 14, p. 3165-3168

We present the first characterization of the noise properties and modulation response of the carrier-envelope offset (CEO) frequency in a semiconductor modelocked laser. The CEO beat of an optically-pumped vertical external-cavity surface-emitting laser (VECSEL) at 1030 nm was characterized without standard ƒ-to-2ƒ interferometry. Instead, we used an appropriate combination of...

Université de Neuchâtel

Frequency comb metrology with an optical parametric oscillator

Balskus, K ; Schilt, Stéphane ; Wittwer, Valentin J ; Brochard, Pierre ; Ploetzing, T ; Jornod, Nayara ; McCracken, R. A ; Zhang, Z ; Bartels, A ; Reid, D. T ; Südmeyer, Thomas

In: Optics Express, 2016, vol. 24, no. 8, p. 8370-8381

We report on the first demonstration of absolute frequency comb metrology with an optical parametric oscillator (OPO) frequency comb. The synchronously-pumped OPO operated in the 1.5-μm spectral region and was referenced to an H-maser atomic clock. Using different techniques, we thoroughly characterized the frequency noise power spectral density (PSD) of the repetition rate...

Université de Neuchâtel

Characterizing the carrier-envelope offset in an optical frequency comb without traditional f-to-2f interferometry

Brochard, Pierre ; Schilt, Stéphane ; Wittwer, Valentin J ; Südmeyer, Thomas

In: Optics Letters, 2015, vol. 40, no. 23, p. 5522-5525

We present a new method to measure the frequency noise and modulation response of the carrier-envelope offset (CEO) beat of an optical frequency comb that does not make use of the traditional f-to-2f interferometry. Instead, we use an appropriate combination of different signals to extract the contribution of the CEO frequency without directly detecting it. We present a...