Ultranarrow-linewidth lasers on a silicon chip and their applications

Markus Pollnau

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

    Abstract

    We demonstrate diode-pumped distributed-feedback (DFB) and distributed-Bragg-reflector (DBR) channel waveguide lasers in Al2O3:Er3+ and Al2O3:Yb3+ on silicon substrates. Uniform surface-relief Bragg gratings are patterned by laser-interference lithography and etched into the SiO2 top cladding, providing reflectivities exceeding 99%. Monolithic DFB and DBR cavities with Q-factors of up to 1.35×10^6 are realized. The Er3+-doped DFB laser delivers 3 mW of output power at 1545 nm with 41% slope efficiency versus absorbed pump power. Single-longitudinal-mode operation at a wavelength of 1545.2 nm is achieved with an emission linewidth of 1.7 kHz, corresponding to a laser Q-factor of 1.14×10^11. Yb3+-doped DFB and DBR lasers operate with output powers of 55 mW near 1020 nm and 67% slope efficiency versus launched pump power. A dual-wavelength laser utilizing two local phase shifts in the DFB structure is achieved. A stable microwave signal at ~15 GHz with a –3-dB width of 9 kHz and a long-term frequency stability of ±2.5 MHz is created via heterodyne photo-detection of the two laser wavelengths. Measuring changes in the microwave beat signal, as the intra-laser-cavity evanescent field interacts with micro-particles on the waveguide surface, enables real-time detection and accurate size measurement of single micro-particles with diameters of 1-20 μm.
    Original languageUndefined
    Title of host publication16th International Conference on Transparent Optical Networks, ICTON 2014
    Place of PublicationUSA
    PublisherIEEE Photonics Society
    PagesPaper Mo.B.1
    Number of pages4
    ISBN (Print)978-1-4799-5601-2
    DOIs
    Publication statusPublished - Jul 2014
    Event16th International Conference on Transparent Optical Networks, ICTON 2014 - Graz, Austria
    Duration: 6 Jul 201410 Jul 2014
    Conference number: 16

    Publication series

    Name
    PublisherIEEE Photonics Society

    Conference

    Conference16th International Conference on Transparent Optical Networks, ICTON 2014
    Abbreviated titleICTON
    CountryAustria
    CityGraz
    Period6/07/1410/07/14

    Keywords

    • IOMS-APD: Active Photonic Devices
    • intra-laser-cavity optical sensing
    • distributed-feedback laser
    • METIS-305981
    • rare-earth-ion laser
    • IR-91591
    • Aluminium oxide
    • EWI-24975

    Cite this

    Pollnau, M. (2014). Ultranarrow-linewidth lasers on a silicon chip and their applications. In 16th International Conference on Transparent Optical Networks, ICTON 2014 (pp. Paper Mo.B.1). USA: IEEE Photonics Society. https://doi.org/10.1109/ICTON.2014.6876265