Dichloromethane detection based on near-infrared absorptive sensing

Jae Ho Han, Sang Min Yoon

Research output: Contribution to journalReview articlepeer-review

3 Citations (Scopus)


Dichloromethane (DCM), a clear and lipophilic liquid that has been primarily used in industrial applications, has caused organic poisoning upon inhalation during its wide use as a chlorinated organic solvent and in other industrial processes. In this paper, a biophotonic near-infrared sensor using a tunable fiber ring laser based on an absorption spectroscopic method has been demonstrated in order to perform DCM detection. A continuous wave near-infrared source operating in the C-band wavelength range has been developed and optically characterized. The principle of the Sagnac loop mirror, which operates as a saturable absorber to effectively narrow down the laser linewidth, has been reviewed. By forming a fiber-based interferometer loop with an unpumped erbium-doped fiber inserted, we could reduce the external noise and stabilize the laser frequency to achieve a narrow linewidth. The result shows an accuracy of 16 pm or 0.06 cm -1, which is much more precise than the previous results of 1 nm or 4 cm -1 using a method based on a broadband infrared light source.

Original languageEnglish
Article number6107513
Pages (from-to)1547-1552
Number of pages6
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number5
Publication statusPublished - 2012


  • Biophotonics
  • fiber optics
  • optical fiber lasers
  • optical sensors
  • spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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