Andres Forrer


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Forrer

First Name

Andres

ORCID

0000-0002-9229-1110

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2019 - 201912020 - 202451
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Publications1 - 10 of 52
  • THz optical beatnote detection with a fast hot electron bolometer operating up to 31 GHz
    Item type: Other Conference Item
    Cibella, Sara; Forrer, Andres; Beck, Mattias; et al. (2023)
    Proceedings of SPIE ~ Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI
    We studied the performance of hot-electron bolometers (HEBs) operating at THz optical frequencies based on superconducting niobium nitride films. We report on large optical bandwidth measurement of the voltage response of the detector carried out with different THz sources. We show that the impulse response of the fully packaged HEB at 7.5 K has a 3 dB cut-off around 2 GHz, but a considerable detection capability is also observed above 30 GHz recorded in mixing mode operation by using a THz frequency comb quantum cascade laser
  • Self-Starting Harmonic Combs in THz Quantum Cascade Lasers
    Item type: Conference Paper
    Forrer, Andres; Beck, Mattias; Faist, Jérôme; et al. (2021)
    2021 Conference on Lasers and Electro-Optics (CLEO)
    We report on high temperature, self-starting THz Quantum Cascade Laser harmonic frequency combs. Their coherence is assessed by electrical beatnote measurements and a self-mixing technique and their beatnote can be injection-locked to a RF source.
  • Terahertz optical solitons from dispersion-compensated antenna-coupled planarized ring quantum cascade lasers
    Item type: Journal Article
    Micheletti, Paolo; Senica, Urban; Forrer, Andres; et al. (2023)
    Science Advances
    Quantum cascade lasers (QCLs) constitute an intriguing opportunity for the generation of on-chip optical dissipative Kerr solitons (DKSs). Originally demonstrated in passive microresonators, DKSs were recently observed in mid-infrared ring QCL paving the way for their achievement even at longer wavelengths. To this end, we realized defect-free terahertz ring QCLs featuring anomalous dispersion leveraging on a technological platform based on waveguide planarization. A concentric coupled waveguide approach is implemented for dispersion compensation, while a passive broadband bullseye antenna improves the device power extraction and far field. Comb spectra featuring sech2 envelopes are presented for free-running operation. The presence of solitons is further supported by observing the highly hysteretic behavior, measuring the phase difference between the modes, and reconstructing the intensity time profile highlighting the presence of self-starting 12-picosecond-long pulses. These observations are in very good agreement with our numeric simulations based on a Complex Ginzburg-Landau Equation (CGLE).
  • Photon-Driven Broadband Emission and Frequency Comb RF Injection Locking in THz Quantum Cascade Lasers
    Item type: Journal Article
    Forrer, Andres; Franckié, Martin; Stark, David; et al. (2020)
    ACS Photonics
  • Linewidth Enhancement Factor of Mid-IR Quantum Cascade Lasers
    Item type: Other Conference Item
    Bertrand, Mathieu; Franckié, Martin; Forrer, Andres; et al. (2021)
    2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
    Schawlow and Townes theorized that the ratio between the spontaneous emission and stimulated emission in a semiconductor laser defines its linewidth lower limit [1] . However, experiments showed that this intrinsic linewidth is larger, which was later demonstrated to be due to the coupling between the optical gain and the phase noise [2] . The linewidth enhancement factor (LEF) was introduced to quantify this process and as a correction to the linewidth formula in [1] .
  • Planarized terahertz quantum cascade laser frequency combs for coherent integrated photonics
    Item type: Conference Paper
    Senica, Urban; Gloor, Sebastian; Micheletti, Paolo; et al. (2024)
    6th International Symposium on Microwave/THz Science and Applications (MTSA 2024): Book of Abstracts
  • Measurement of sub-poissonian noise in a Quantum Cascade Detector
    Item type: Conference Poster
    Heckelmann, Ina; Bertrand, Mathieu; Forrer, Andres; et al. (2022)
  • Linewidth enhancement factor in quantum cascade lasers: measurements and modelling
    Item type: Conference Poster
    Franckié, Martin; Bertrand, Mathieu; Forrer, Andres; et al. (2022)
    Proceedings of SPIE ~ Solid State Lasers XXXI: Technology and Devices
  • High speed response of a Hot Electron Bolometer to a picosecond optical THz source and to a THz QCL comb up to 31GHz
    Item type: Other Conference Item
    Torrioli, Guido; Forrer, Andres; Senica, Urban; et al. (2022)
    2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
    We have investigated the frequency response of a phonon-cooled Hot Electron Bolometer (HEB) made from an ultrathin superconducting niobium nitride film. We have used short optical pulses and a broadband spectrum analyzer to record the impulse response of the HEB. To interpret the experimental results, we have used numerical calculations based on the two temperature (2T) theoretical model.
  • Terahertz Frequency Combs from Dispersion Compensated Quantum Cascade Ring Lasers
    Item type: Other Conference Item
    Micheletti, Paolo; Senica, Urban; Forrer, Andres; et al. (2022)
    Proceedings of SPIE ~ Laser Resonators, Microresonators, and Beam Control XXIV
    We report frequency combs formation in THz QCL ring cavities. The double metal waveguide laser is encapsulated in benzocyclobutene (BCB) on which the top contact is deposited. This allows to explore alternative designs such as ultrathin ring cavities and coupled double ring waveguides avoiding issues with the electrical connection of the. Ring laser operating in dense comb regime with spectral bandwidth of ~500 GHz is here reported. In addition to the frequency comb operation sech2-shaped spectra are observed in RF-injected ring lasers and dispersion compensated double ring cavities, hinting at the existence of soliton regimes in the QCL.
Publications1 - 10 of 52