Tunability of optofluidic distributed feedback dye lasers

Morten Gersborg-Hansen, Anders Kristensen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We investigate the tunability of optofluidic distributed feedback (DFB) dye lasers. The lasers rely on light-confinement in a nano-structured polymer film where an array of nanofluidic channels constitutes a third order Bragg grating DFB laser resonator with a central phase-shift. The lasers are operated by filling the DFB laser resonator with a dye solution by capillary action and optical pumping with a frequency doubled Nd: YAG laser. The low reflection order of the DFB laser resonator yields low out-of-plane scattering losses as well as a large free spectral range (FSR), and low threshold fluences down to similar to 7 mu J/mm2 are observed. The large FSR facilitates wavelength tuning over the full gain spectrum of the chosen laser dye and we demonstrate 45 nm tunability using a single laser dye by changing the grating period and dye solution refractive index. The lasers are straight-forward to integrate on lab-on-a-chip microsystems, e. g. for novel sensor concepts, where coherent light in the visible range is desired.
    Original languageEnglish
    JournalOptics Express
    Volume15
    Issue number1
    Pages (from-to)137-142
    ISSN1094-4087
    DOIs
    Publication statusPublished - 2007

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