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10 Jun 2025 • Journal Article • ACS Photonics
Increased Modal Gain in 1.55 μm Quantum Dot Lasers Based on Improved Size Homogeneity Obtained by Comprehensive Growth Optimization
AbstractInAs quantum dot (QD) lasers exhibit improved properties compared to quantum well lasers like higher temperature stability, lower threshold current density, and significantly reduced laser line width. This study aims to further optimize InAs-QD morphology and optical material properties in order to narrow the gain spectrum of the ground state transition, improving the
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25 Nov 2024 • Journal Article • Applied Physics Letters
Strategies for the alignment of electronic states in quantum-dot tunnel-injection lasers
AbstractIn quantum-dot tunnel-injection lasers, the excited charge carriers are efficiently captured from the bulk states via an injector quantum well and then transferred into the quantum dots via a tunnel barrier. The alignment of the electronic levels is crucial for the high efficiency of these processes and especially for the fast modulation dynamics of these lasers. In
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5 Jan 2024 • Conference Paper • Semiconductor Lasers and Laser Dynamics X
Large-field-of-view optical-resolution optoacoustic microscopy using a stationary silicon-photonics acoustic detector
AbstractSignificanceOptical-resolution optoacoustic microscopy (OR-OAM) enables label-free imaging of the microvasculature by using optical pulse excitation and acoustic detection, commonly performed by a focused optical beam and an ultrasound transducer. One of the main challenges of OR-OAM is the need to combine the excitation and detection in a coaxial configuration, often
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5 Sep 2023 • Journal Article • Physical Review Research
Combined time and frequency spectroscopy with engineered dual-comb spectrometer
AbstractDual-comb spectroscopy (DCS) is a powerful technique for broadband spectroscopy with high precision. High-frequency resolution requires long data acquisition times, limiting the temporal resolution in time-resolved measurements. We overcome this limitation by engineering the interaction between the sample under test and the DCS pulsed laser. The DCS interferogram is
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17 Jul 2023 • Journal Article • Optics Express
Highly coherent hybrid dual-comb spectrometer
AbstractDual comb spectroscopy (DCS) is a broadband technique offering high resolution and fast data acquisition. Current state-of-the-art designs are based on a pair of fiber or solid-state lasers, which allow broadband spectroscopy but require a complicated stabilization setup. Semiconductor lasers are tunable, cost-effective, and easily integrable while limited by a narrow
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21 Jun 2023 • Journal Article • Nature Communications
Imaging the field inside nanophotonic accelerators
AbstractControlling optical fields on the subwavelength scale is at the core of nanophotonics. Laser-driven nanophotonic particle accelerators promise a compact alternative to conventional radiofrequency-based accelerators. Efficient electron acceleration in nanophotonic devices critically depends on achieving nanometer control of the internal optical nearfield. However, these
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May 2023 • Journal Article • CLEO: Science and Innovations
United time and frequency spectroscopy with engineered dual comb spectrometer
AbstractWe report a dual-comb spectrometer having engineered pulse trains used to study two-level system dynamics with high frequency and temporal resolutions. The exci-tation evolution of rubidium isotopes was measured with a resolution of 4ns.
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8 Mar 2023 • Journal Article • Bulletin of the American Physical Society
A phase stable hybrid dual comb spectrometer for time-resolved spectroscopy
AbstractDual comb spectroscopy (DCS) is a broadband technique offering high resolution and fast data acquisition. We describe a hybrid dual-comb spectrometer comprising a broadband commercial fiber laser and an actively mode-locked semiconductor laser with a tunable and relatively narrow spectrum. We have devised a direct locking method, which leads to high long-term absolute
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31 Jan 2023 • Journal Article • Nanophotonics
On the relation between electrical and electro-optical properties of tunnelling injection quantum dot lasers
AbstractWe present a comprehensive study of the temperature dependent electronic and optoelectronic properties of a tunnelling injection quantum dot laser. The optical power-voltage ( P opt – V ) characteristics are shown to be correlated with the current-voltage ( I – V ) and capacitance-voltage ( C – V ) dependencies at low and elevated temperatures. Cryogenic temperature
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21 Jun 2022 • Journal Article • Nanophotonics
Steering coherence in quantum dots by carriers injection via tunneling
AbstractCoherent control is a key experimental technique for quantum optics and quantum information processing. We demonstrate a new degree of freedom in coherent control of semiconductor quantum dot (QD) ensembles operating at room temperature using the tunneling injection (TI) processes in which charge carriers tunnel directly from a quantum well reservoir to QD confined
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