Barbara Schneider

Last Name

Schneider

First Name

Barbara

ORCID

0000-0003-2433-9693

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Publications1 - 10 of 31

Manipulation of liquid light in fast-gain frequency-comb lasers
Dikopoltsev, Alex; Heckelmann, Ina; Piciocchi, Diego; et al. (2024)
10th Workshop on the Physics and Technology of Semiconductor Lasers: Book of Abstracts
Mid-infrared femtosecond pulses from a quantum cascade laser
Täschler, Philipp; Bertrand, Mathieu; Schneider, Barbara; et al. (2022)
Proceedings of SPIE ~ Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXII
In recent years, quantum cascade lasers have matured to become compact, powerful sources of coherent mid infrared light. Yet, the ultrafast carrier dynamics in these sources has so far restricted the formation of high intensity ultrashort pulses. In this work, we demonstrate the formation of ~ 630 fs QCL pulses with a peak power of ~ 4.3 W. We break the picosecond barrier in an approach similar to chirped pulse amplification, where we externally recompress the maximally chirped output of a quantum cascade laser frequency comb. Ultrashort pulse formation is confirmed with a novel asynchronous optical sampling technique. These results emphasise the potential of quantum cascade lasers also as sources for non-linear experiments in the mid-infrared.
Optimization of growth conditions of strain compensated InGaAs/InAIAs quantum cascade lasers
Le Biavan, Nolwenn Marie; Dupre, C.; Schneider, Barbara; et al. (2023)
Direct measurement of an ultrafast sub-bandwidth-limited signal in mid-infrared quantum cascade lasers
Schneider, Barbara; Dikopoltsev, Alex; Täschler, Philipp; et al. (2023)
EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2023)
Frequency comb lasers with fast gain recovery times naturally favor the emission of frequency mod-ulated periodic signals, which are useful for multiple applications in spectroscopy and communications. Models and phase measurements predict an ultrashort strong intensity spike at the instantaneous frequency discontinuity of the cavity cycle. Here we experimentally study the ultrashort spike of fast-gain frequency modulated combs through direct upconversion sampling, and measure a width below that of a transform-limited pulse. Specifi-cally, we demonstrate a mid-infrared quantum cascade laser which inherently lases in a frequency modulated comb and produces a spike with full-width at half-maximum below 600 fs, which is below the Fourier-limit derived from the corresponding spectrum. We believe these ultrashort spikes can be highly beneficial for sub-bandwidth time domain measurements. Using mean-field theory based simulations, we confirm the occurrence of such features as well as further optimize our system for going even further below the Fourier-limit.
Femtosecond pulses from a mid-infrared quantum cascade laser
Taeschler, Philipp; Betrand, Mathieu; Schneider, Barbara; et al. (2021)
2021 Conference on Lasers and Electro-Optics (CLEO)
We report on the formation of near-transform-limited sub-picosecond pulses from a mid-infrared quantum cascade laser with several Watts of peak power. Starting from a frequency-modulated phase-locked state, which most efficiently exploits the gain from the active region, ultrashort high peak power pulses are generated via external pulse compression. The temporal nature of these pulses is assessed by means of coherent beatnote interferometry, optical sampling and an interferometric autocorrelation technique.
Femtosecond pulses from a mid-infrared quantum cascade laser
Täschler, Philipp; Bertrand, Mathieu; Schneider, Barbara; et al. (2021)
Nature Photonics
The quantum cascade laser has evolved to be a compact, powerful source of coherent mid-infrared light; however, its fast gain dynamics strongly restricts the formation of ultrashort pulses. As such, the shortest pulses reported so far were limited to a few picoseconds with some hundreds of milliwatts of peak power, strongly narrowing their applicability for time-resolved and nonlinear experiments. Here we demonstrate an approach capable of producing near-transform-limited subpicosecond pulses with several watts of peak power. Starting from a frequency-modulated phase-locked state, ultrashort high-peak-power pulses are generated via spectral filtering, gain modulation-induced spectral broadening and external pulse compression. We assess their temporal nature by means of a novel asynchronous sampling method, coherent beat note interferometry and interferometric autocorrelation. These results open new pathways for nonlinear physics in the mid-infrared.
Mid-infrared quantum cascade laser frequency combs with a microstrip-like line waveguide geometry
Kapsalidis, Filippos; Schneider, Barbara; Singleton, Matthew; et al. (2021)
Applied Physics Letters
In this work, a design for a mid-infrared quantum cascade laser frequency comb source that enhances the high frequency response and the comb characteristics of the device is presented. A state-of-the-art active region, grown on a heavily n-doped InP:Si substrate, was processed into a buried heterostructure with a microstrip-like line waveguide. As a result, the repetition rate frequency frep, around 11.09 GHz, can be locked to an injected narrow-linewidth radio frequency (RF) signal, over a range of more than 200 kHz with an injected power of −10 dBm, which outperforms normal buried heterostructure schemes by an order of magnitude. Moreover, under RF injection at powers higher than 20 dBm, the lasing spectrum is flattened and significantly broadened, from 24 cm−1 to 65 cm−1 in bandwidth, while at the same time, the coherence of the comb is maintained and verified.
Heterodyne coherent detection of the electric field temporal trace emitted by frequency-modulated comb lasers
Chomet, Baptiste; Basceken, Salim; Gacemi, Djamal; et al. (2024)
Optica
Frequency-modulated (FM) combs are produced by mode-locked lasers in which the electric field has a linearly chirped frequency and nearly constant amplitude. This regime of operation occurs naturally in certain laser systems and constitutes a valuable alternative to generate spectra with equidistant modes. Here, we use a low-noise fs-pulse comb as the local oscillator and combine dual comb heterodyne detection with time domain analysis of the multi-heterodyne signal to reveal the temporal trace of both amplitude and phase quadratures of FM comb lasers’ electric field. This technique is applied to both a dense and a harmonic mid-infrared free-running quantum cascade laser frequency comb and shows direct evidence of the FM behavior together with the high degree of coherence of these sources. Our results furnish a deeper insight on the origin of the FM combs and pave the way to further improvement and optimization of these devices.
Quantum cascade laser femtosecond pulses for supercontinuum generation
Täschler, Philipp; Bertrand, Mathieu; Schneider, Barbara; et al. (2022)
OSA Technical Digest ~ Conference on Lasers and Electro-Optics
In this work, we demonstrate the generation of 630 fs, 4.5 W pulses from a mid-infrared quantum cascade laser by gain modulation induced spectral broadening and external pulse compression. Such sources open new pathways for broadband supercontinuum generation in the mid-infrared.
Coherent Broadening and Tuning of QCL Frequency Combs via RF-Injection
Schneider, Barbara; Kapsalidis, Filippos; Bertrand, Mathieu; et al. (2022)
Proceedings of SPIE ~ Quantum Sensing and Nano Electronics and Photonics XVIII
We present strong radio-frequency current modulation close to their repetition frequency as a means to control the emitted state of quantum cascade laser frequency combs. In particular, more than doubling of the spectral bandwidth compared to free-running can be achieved throughout the dynamical range of the device. By changing the modulation frequency, the spectral bandwidth and center-frequency can be tuned and by fast switching between modulation frequencies we can multiplex spectral regions with negligible overlap from the same device. In the time-domain, we are able to transition from quasi-continuous to long-pulse output by injecting at high power.

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Barbara Schneider

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