Mr. Sandro Dal Cin Profile

Sandro Dal Cin

at TU Wien

SPIE Involvement:

Author

Publications (13)

Proceedings Article | 13 March 2024 Presentation

Interband cascade lasers: from carrier transport to frequency combs

Benedikt Schwarz, Andreas Windischhofer, Florian Pilat, Sandro Dal Cin, Hedwig Knötig, Josephine Nauschütz, Sven Höfling, Robert Weih

Proceedings Volume PC12905, PC129050E (2024) https://doi.org/10.1117/12.3003829

KEYWORDS: Frequency combs, Quantum cascade lasers, Spectrometers, Nonlinear dynamics, Mode locking, Miniaturization, Integrated photonics

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Proceedings Article | 13 March 2024 Presentation

Bright-dark solitons in a hybridized frequency comb

Theodore Letsou, Dmitry Kazakov, Pawan Ratra, Lorenzo Columbo, Sandro Dal Cin, Nikola Opacak, Marco Piccardo, Benedikt Schwarz, Federico Capasso

Proceedings Volume PC12905, PC1290509 (2024) https://doi.org/10.1117/12.3016806

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Proceedings Article | 13 March 2024 Presentation

Nonlinear mid-infrared photonics with active resonators

Dmitry Kazakov, Theodore Letsou, Pawan Ratra, Marco Piccardo, Lorenzo Columbo, Massimo Brambilla, Franco Prati, Sandro Dal Cin, Maximillian Beiser, Nikola Opacak, Michael Pushkarsky, David Caffey, Timothy Day, Luigi Lugiato, Benedikt Schwarz, Federico Capasso

Proceedings Volume PC12905, PC1290508 (2024) https://doi.org/10.1117/12.3003043

KEYWORDS: Mid-IR, Photonics, Tunable filters, Solitons, Semiconductors, Phase shifts, Optical resonators, Nonlinear optics, Nonlinear filtering, Resonators

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Proceedings Article | 17 March 2023 Presentation

Ring quantum cascade lasers as versatile photonic components for the mid-infrared

Dmitry Kazakov, Theodore Letsou, Nikola Opačak, Maximillian Beiser, Sandro Dal Cin, Lorenzo Columbo, Massimo Brambilla, Franco Prati, Luigi Lugiato, Marco Piccardo, Benedikt Schwarz, Federico Capasso

Proceedings Volume PC12440, PC124400I (2023) https://doi.org/10.1117/12.2647068

KEYWORDS: Quantum cascade lasers, Mid-IR, Molecular spectroscopy, Wavelength division multiplexing, Tunable filters, Transceivers, Spectroscopy, Spectrometers, Optical amplifiers, Molecular photonics

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Proceedings Article | 17 March 2023 Presentation

Quantum cascade laser frequency combs induced by a giant Kerr nonlinearity

B. Schwarz, N. Opacak, F. Pilat, D. Kazakov, S. Dal Cin, M. Beiser, L. Columbo, J. Hillbrand, M. Piccardo, F. Capasso

Proceedings Volume PC12440, PC124400F (2023) https://doi.org/10.1117/12.2651688

KEYWORDS: Quantum cascade lasers, Frequency combs, Semiconductor lasers, Nonlinear optics

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Proceedings Article | 9 March 2023 Presentation

Frequency performance of quantum cascade and interband cascade detectors

Gottfried Strasser, Hedwig Maria Knötig, Anna Lardschneider, Jonas Heinrich, Johannes Hillbrand, Leonard krüger, Sandro Dal Cin, Aaron Andrews, Robert Weih, Johannes Koeth, Ursula Keller, Benedikt Schwarz

Proceedings Volume PC12447, PC124471Z (2023) https://doi.org/10.1117/12.2657340

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Proceedings Article | 25 May 2022 Presentation

Interband cascade laser frequency combs

Benedikt Schwarz, Maximilian Beiser, Florian Pilat, Sandro Dal Cin, Johannes Hillbrand, Robert Weih, Johannes Koeth, Sven Höfling

Proceedings Volume PC12141, PC121410K (2022) https://doi.org/10.1117/12.2624340

KEYWORDS: Frequency combs, Quantum cascade lasers, Mode locking, Spectrometers, Photodetectors, Mid-IR, Spectroscopy, Scattering, Pulsed laser operation, Picosecond phenomena

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Proceedings Article | 25 May 2022 Presentation

The linewidth enhancement factor of a semiconductor frequency comb: a spectrally-resolved measurement technique

Florian Pilat, Nikola Opačak, Dmitry Kazakov, Sandro Dal Cin, Federico Capasso, Gottfried Strasser, Benedikt Schwarz

Proceedings Volume PC12141, PC121410C (2022) https://doi.org/10.1117/12.2621511

KEYWORDS: Frequency combs, Semiconductors, Modulation, Semiconductor lasers, FT-IR spectroscopy, Surgery, Spectroscopy, Quantum well infrared photodetectors, Quantum cascade lasers, Phase shift keying

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Semiconductor lasers are compact, electrically pumped sources of coherent light. If designed properly they emit frequency combs, which nowadays find application in various areas such as telecommunications, metrology and high-precision spectroscopy for chemical sensing and medical diagnostics. Laser design and optimization require profound knowledge of the working principles at play and powerful techniques to infer their characteristics. One of these characteristic quantities is the linewidth enhancement factor (LEF). It originates from a theoretical description of the linewidth broadening beyond the Shawlow-Townes-limit, but is recently moving in the spotlight of frequency comb research to understand dynamic processes like modulation response, comb formation and even soliton generation. However, as of yet the experimental investigation of the LEF was limited to single-mode laser operation or measurements below to the lasing threshold. This is insufficient, since the LEF changes drastically with the laser bias and is dependent on the wavelength. In this work we present a novel technique which enables the spectrally-resolved measurement of the LEF of an arbitrary laser source regardless of the operation state or bias. It relies on the RF modulation of the driving bias and “Shifted Wave Interference Fourier Transform Spectroscopy” (SWIFTS) – a phase-sensitive measurement scheme. When investigating a laser frequency comb, a single-shot measurement reveals the spectral dependence of the LEF over the whole comb spectrum. Extensive simulations utilizing a numerical spatiotemporal model based on the Maxwell–Bloch formalism were performed to explore the success of this approach. The technique was vastly tested by simulating both, single-mode lasers and laser frequency combs. A comparison to the theoretical model shows good agreement. The experimental demonstration of the technique is performed on a quantum cascade laser (QCL) frequency comb. The resulting LEF values are comparable to recent publications and follow the spectral shape predicted by the theoretical model.

Proceedings Article | 25 May 2022 Presentation

Lateral mode switching in broader ridge waveguide Fabry-Perot quantum cascade laser frequency combs

Sandro Dal Cin, Florian Pilat, Benedikt Schwarz, Gottfried Strasser

Proceedings Volume PC12141, PC121410B (2022) https://doi.org/10.1117/12.2621475

KEYWORDS: Switching, Quantum cascade lasers, Frequency combs, Waveguides, Fabry–Perot interferometers, Frequency modulation, Spectroscopy, Terahertz radiation, Sensors, Refractive index

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Radio-frequency (RF) modulation of FP-QCLs has been demonstrated to be a crucial tool for the control and manipulation of frequency comb states and internal synchronization mechanisms. Coherent injection locking of the repetition frequency, switching from the intrinsic anti-phase synchronized FM-state to the in-phase synchronized AM-state and spectral broadening are just a few examples of recent findings linked to RF injection as a means of control mechanism. We present the observation of controlled lateral mode switching in a two section, RF-modulation optimized, 12μm broad ridge FP-QCL. The mode switching is induced by strong RF modulation close to the free-running laser beatnote at the repetition frequency. It is shown that the anti-phase FM-comb state intrinsic to most free-running FP-QCLs, exceeding a certain ridge width, favors a higher order dual lobe state which can be observed in the far-field. Injecting an RF signal with a power of 35 dBm, 65 MHz above the free-running laser beatnote, the resulting comb state is shown to favor the fundamental, mode. The resulting single lobe far-field distribution was measured experimentally with a slow MCT detector mounted on a rotational stage. The lateral mode switching from the first higher order- to the fundamental mode can be observed over the entire laser operation current bias range of the gain section. 2D mode simulations yielding the fundamental and higher order mode group refractive indices show good agreement with the measured results. Furthermore RF modulation below the free-running laser beatnote shows the excitement of a second, higher order lateral mode, where three lobes are observed in the far-field. The results presented show the potential for reliable lateral mode control via strong RF modulation close to the repetition frequency of broader ridge FP-QCLs. This opens up the possibility for high power comb operation scaling with the ridge width, while still maintaining a single lobe far-field

Proceedings Article | 24 May 2022 Presentation

Frequency comb operation induced by a giant Kerr nonlinearity in quantum cascade lasers

Benedikt Schwarz, Nikola Opacak, Florian Pilat, Dmitry Kazakov, Sandro Dal Cin, Maximilian Beiser, Lorenzo Columbo, Johannes Hillbrand, Marco Piccardo, Federico Capasso

Proceedings Volume PC12131, PC121310C (2022) https://doi.org/10.1117/12.2621685

KEYWORDS: Quantum cascade lasers, Frequency combs, Ultrafast phenomena, Turbulence, Spectroscopy, Solitons, Semiconductor lasers, Nonlinear optics

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Proceedings Article | 5 March 2021 Presentation

Origin of the linewidth enhancement factor: Resonant processes behind optical frequency comb formation

Nikola Opacak, Sandro Dal Cin, Johannes Hillbrand, Gottfried Strasser, Benedikt Schwarz

Proceedings Volume 11705, 1170511 (2021) https://doi.org/10.1117/12.2577796

KEYWORDS: Frequency combs, Quantum cascade lasers, Scattering, Laser scattering, Turbulence, Semiconductor lasers, Microresonators, Kerr effect, Dispersion

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Proceedings Article | 5 March 2021 Presentation

Frequency performance of intersubband detectors

Gottfried Strasser, Johannes Hillbrand, Hedwig Knötig, Sandro Dal Cin, Robert Weih, Aaron Andrews, Hermann Detz, Benedikt Schwarz

Proceedings Volume 11700, 1170040 (2021) https://doi.org/10.1117/12.2586923

KEYWORDS: Sensors, Sensor performance

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Proceedings Article | 5 March 2021 Presentation

Mid-infrared frequency combs based on semiconductor lasers

Benedikt Schwarz, Maximilian Beiser, Sandro Dal Cin, Johannes Hillbrand, Nikola Opacak, Gottfried Strasser, Harald Schneider, Marco Piccardo, Federico Capasso, Robert Weih

Proceedings Volume 11705, 117050S (2021) https://doi.org/10.1117/12.2582492

KEYWORDS: Frequency combs, Semiconductor lasers, Mid-IR, Quantum cascade lasers, Spectrometers, Picosecond phenomena, Modulators, Modulation, Integrated photonics, Integrated optics

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Showing 5 of 13 publications

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