Philipp Täschler


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Täschler

First Name

Philipp

ORCID

0000-0001-7737-8704

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2021 - 202531
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Publications 1 - 10 of 31
  • Monolithic Integration of Mid-Infrared Quantum Cascade Lasers and Frequency Combs with Passive Waveguides
    Item type: Journal Article
    Wang, Ruijun; Täschler, Philipp; Wang, Zhixin; et al. (2022)
    ACS Photonics
    Mid-infrared semiconductor lasers in photonic integrated circuits are of considerable interest for a variety of industrial, environmental, and medical applications. However, photonic integration technologies in the mid-infrared lag far behind the near-infrared range. Here we present the monolithic integration of mid-infrared quantum cascade lasers with low-loss passive waveguides via butt-coupling. The passive waveguide losses are experimentally evaluated to be only 1.2 ± 0.3 dB/cm, with negligible butt-coupling losses. We demonstrate continuous-wave lasing at room temperature of these active-to-passive waveguide coupled devices. Moreover, we report a frequency comb operation paving the way toward on-chip, mid-infrared, dual-comb sensors.
  • Commercializing Quantum Cascade Surface Emitting Lasers From the Lab to Market
    Item type: Other Conference Item
    Stark, David; Bertrand, Mathieu; Täschler, Philipp; et al. (2024)
  • Miniature Quantum Cascade Surface Emitting Ring Lasers
    Item type: Other Conference Item
    Vass, Réka-Eszter; Täschler, Philipp; Stark, David; et al. (2025)
    2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
    Mid-infrared laser sources operating with low power dissipation on small device footprints are essential for compact and portable spectroscopic applications [1]. Quantum Cascade Lasers (QCLs) with tunable emission wavelengths in the molecular fingerprint region [2] offer a platform for developing such sources. In particular, QCL active regions embedded in ring-shaped cavities are promising candidates. The ring geometry supports low optical losses due to the formation of whispering gallery modes (WGMs) in the cavity, providing a route toward device miniaturization and reduced power consumption [3].
  • Spatiotemporal non-Hermitian skin-effect in a fast-gain laser
    Item type: Other Conference Item
    Dikopoltsev, Alex; Schneider, Barbara; Bestler, Markus; et al. (2025)
    2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
    Topological bound states offer robust and defect-immune confinement of energy, enabling precise control over light waves even in the presence of imperfections or disorder in the system. Initially studied only in Hermitian systems, Topological states were recently explored in non-Hermitian platforms [1], which through gain and loss engineering allow for robust states, topological skin-effect [2] and even topological lasing. Interestingly, such states result from models in space, while suggestions to study topology in time varying frames [3] are experimentally challenging, resulting only in artificial lattices mimicking the time dimension [4].
  • Low-dissipation Miniature Quantum Cascade Surface Emitting Ring Lasers
    Item type: Other Conference Item
    Vass, Réka-Eszter; Stark, David; Täschler, Philipp; et al. (2025)
  • Femtosecond pulses from a mid-infrared quantum cascade laser
    Item type: Other Conference Item
    Täschler, Philipp; Bertrand, Mathieu; Schneider, Barbara; et al. (2021)
    2021 27th International Semiconductor Laser Conference (ISLC)
    We report on the generation of near-transform-limited femtosecond pulses from a mid-infrared quantum cascade laser by external pulse compression. The temporal nature of these pulses is assessed by means of a novel optical sampling method, coherent beatnote interferometry and interferometric autocorrelation.
  • Asynchronous Upconversion Sampling of Frequency Modulated Combs
    Item type: Journal Article
    Täschler, Philipp; Forrer, Andres; Bertrand, Mathieu; et al. (2023)
    Laser & Photonics Reviews ~ 17
    In recent years, optical frequency combs with a frequency modulated output have attracted considerable attention. While first observed decades ago in externally modulated lasers, a whole class of semiconductor lasers has since been identified to spontaneously enter such a regime of self frequency modulation. The temporal properties of these sources are commonly measured indirectly via phase-resolved frequency domain measurements. In this work, they demonstrate an asynchronous optical sampling technique which operates directly in time domain.. On the basis of a mid-infrared quantum cascade laser frequency comb, both its instantaneous intensity and optical frequency are measured. The results confirm a quasi-constant intensity output alongside a close to linear frequency chirp, in accordance with phase-resolved spectral measurements. Contrary to previous works, stable phase-locking is achieved in a regime of positive intracavity dispersion resulting in an inversion of the observed frequency modulation.
  • Mid-Infrared Photonic Integrated Platform Based on Fe-Doped InGaAs Buried in InP
    Item type: Other Conference Item
    Montesinos-Ballester, Miguel; Jöchl, Elsa; Wang, Ruijun; et al. (2023)
    2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
    The mid-infrared (mid-IR) spectral range is typically defined from 3 to 20 µm wavelength and has become an important regime for a plethora of industrial or medical purposes, due to the presence of strong absorption lines of many important molecules. This spectral range has been extensively studied during the last two decades, particularly driven by the progress in quantum cascade lasers (QCLs). As next step, the photonic integration of QCLs with low-loss passive waveguides is highly interesting, as it would enable the development of advanced systems with unique features such as high compactness, robustness, reliability or low operating powers. In this regard, and since QCLs are mainly based on III-V group materials, InGaAs/InP-based platforms are particularly interesting for a monolithic integration. Moreover, the wide transparency window of InP and InGaAs semiconductors and the current technological capability to achieve a low effective background doping make these materials very promising for developing low-loss optical waveguides in the mid-IR. For instance, a recent work has demonstrated low propagation losses in the mid-IR based on air-cladded InGaAs-on-InP waveguides operating in TE polarization [1].
  • RF-Injection Controlled Quantum Cascade Lasers
    Item type: Conference Paper
    Schneider, Barbara; Täschler, Philipp; Kapsalidis, Filippos; et al. (2022)
  • RF-Injection Controlled Quantum Cascade Lasers
    Item type: Other Conference Item
    Schneider, Barbara; Täschler, Philipp; Kapsalidis, Filippos; et al. (2022)
    OSA Technical Digest ~ Conference on Lasers and Electro-Optics
    We demonstrate the manipulation of the quantum cascade laser output state using microwave-injection. In the spectral domain, the optical bandwidth can be doubled, whereas in the time-domain, we observe narrow, approximately 1 ps wide features.
Publications 1 - 10 of 31