1. 21 Jun 2022 Journal Article Nanophotonics

    Steering coherence in quantum dots by carriers injection via tunneling

    Abstract

    Coherent 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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  2. 25 May 2022 Conference Paper Semiconductor Lasers and Laser Dynamics X

    Quantum optics in room temperature quantum dot ensembles

    Abstract

    The use of ultrashort pulses allows to induce and observe quantum coherent effects in optical gain media where the coherence time is longer than the excitation pulses namely, room temperature quantum dot ensembles. We use InAs/InP quantum dot optical amplifiers as the experimental platform and have demonstrated effects such as coherently controlled Rabi Oscillations

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  3. 19 Apr 2022 Journal Article Journal of Lightwave Technology

    An ultra-coherent semiconductor laser locked to a short delay fiber Mach-Zehnder interferometer with active fiber noise cancellation

    Abstract

    We propose and demonstrate a technique to vastly reduce the linewidth of a commercially available semiconductor laser operating at 1550 nm by locking it to an all-fiber Mach-Zehnder interferometer (MZI) with a short path length imbalance. The long term linewidth was reduced from 20 kHz to the single and even sub Hz level. Very narrow linewidths can only be measured by

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  4. 10 Oct 2021 Conference Paper 2021 27th International Semiconductor Laser Conference (ISLC)

    Linewidth reduction of a semiconductor laser nodule to 6 Hz by locking to a fiber Mach-Zehnder interferometer

    Abstract

    We demonstrate large linewidth reduction in semiconductor lasers, from 20kHz to the single-Hz regime, by locking to an unstabilized all-fiber Mach-Zehnder interferometer with a short path length imbalance. The results rival solutions using scrupulously stabilized ultra-high-Q cavities thereby enabling new practical applications for highly-coherent sources.

  5. 27 Jan 2021 Journal Article IEEE Nanotechnology Magazine

    1.5-μm Indium Phosphide-Based Quantum Dot Lasers and Optical Amplifiers: The Impact of Atom-Like Optical Gain Material for Optoelectronics Devices

    Abstract

    Using quantum dot (QD) structures as active material for optoelectronics was already in focus before the development of quantum well (QW) lasers and before semiconductor lasers occupied an important place in the market. The big step in reducing laser threshold conditions by substituting bulk gain materials with QWs should find a logical continuation by further reducing

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  6. Sep 2020 Conference Paper 2020 IEEE Photonics Conference (IPC)

    High Resolution, Fast Measurement of an Arbitrary Optical Pulse using Dual Comb Spectroscopy

    Abstract

    A technique to characterize arbitrary optical pulses based on dual comb spectroscopy was developed. We benchmark the method by comparison with conventional characterization methods. The limitations due to fluctuations of phase noise and timing jitters are overcome by implementing computational non-uniform sampling of measured interferograms.

  7. 19 Aug 2020 Journal Article Journal of Applied Physics

    Highly accurate tuning of current–voltage characteristic shift in a photo-sensitive three terminal metal–insulator–semiconductor device

    Abstract

    We present a planar three terminal device fabricated on a silicon-on-insulator substrate. The device is based on a two-layer dielectric stack comprising SiO2 tunneling and HfO2 layers. A so-called gate electrode is placed between two other contacts, of the source and drain, all deposited on the insulator stack. In the dark as well as under illumination, the current–voltage

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  8. 21 Jul 2020 Journal Article Physical Review Applied

    Fast High-Resolution Measurement of an Arbitrary Optical Pulse Using Dual-Comb Spectroscopy

    Abstract

    We present amplitude and phase characterization of short optical pulses using dual-comb spectroscopy, where one comb is a well-characterized stable-frequency comb and the second is the pulse source to be measured. We demonstrate that the technique is suitable for truly arbitrary repetition rates of the two combs. Moreover, the system is highly sensitive and is shown to

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  9. May 2020 Conference Paper Conference on Lasers and Electro Optics

    Co-Occurrence of Resonance and Non-Resonance Tunneling Injection Processes in Quantum Dot Gain Media

    Abstract

    Resonance and non-resonance tunneling processes in tunneling injection quantum dot gain media were demonstrated, to occur simultaneously. Our finding sheds light on the basic tunneling injection schemes and their proper utilization in quantum dot lasers.

  10. 1 May 2020 Conference Paper Conference on Lasers and Electro Optics

    Dual Comb Spectroscopy for Characterization of Short Optical Pulses

    Abstract

    A technique to characterize arbitrary optical pulses based on dual comb spectroscopy was developed. Distortions due to timing and phase fluctuations were determined and a method to compensate for them was demonstrated.