Applied Physics B

, Volume 88, Issue 1, pp 131–135

Fiber-optic ring-down spectroscopy using a tunable picosecond gain-switched diode laser

  • M. Andachi
  • T. Nakayama
  • M. Kawasaki
  • S. Kurokawa
  • H.-P. Loock
Article

DOI: 10.1007/s00340-007-2635-5

Cite this article as:
Andachi, M., Nakayama, T., Kawasaki, M. et al. Appl. Phys. B (2007) 88: 131. doi:10.1007/s00340-007-2635-5

Abstract

Visible and near-infrared laser light pulses were coupled into two different types of optical fiber cavities. One cavity consisted of a short strand of fiber waveguide that contained two identical fiber Bragg gratings. Another cavity was made using a loop of optical fiber. In either cavity ∼40 ps laser pulses, which were generated using a custom-built gain-switched diode laser, circulated for a large number of round trips. The optical loss of either cavity was determined from the ring-down times. Cavity ring-down spectroscopy was performed on 200 pL volumes of liquid samples that were injected into the cavities using a 100 μm gap in the fiber loop. A detection limit of 20 ppm of methylene blue dye in aqueous solution, corresponding to a minimum absorptivity of εC<6 cm-1, was realized.

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • M. Andachi
    • 1
  • T. Nakayama
    • 2
  • M. Kawasaki
    • 2
  • S. Kurokawa
    • 3
  • H.-P. Loock
    • 4
  1. 1.Kyoto Prefectural Technology Center for Small and Medium EnterprisesKyoto Research ParkKyotoJapan
  2. 2.Department of Molecular EngineeringKyoto UniversityKyotoJapan
  3. 3.National Metrology Institute of JapanNational Institute of Advanced Industrial Science and TechnologyTsukubaJapan
  4. 4.Department of ChemistryQueen’s UniversityKingstonCanada

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