Wavelength-modulation detection of acetylene with a near-infrared external-cavity diode laser.

@article{Oh1995WavelengthmodulationDO,
  title={Wavelength-modulation detection of acetylene with a near-infrared external-cavity diode laser.},
  author={Daniel B. Oh and D. Christian Hovde},
  journal={Applied optics},
  year={1995},
  volume={34 30},
  pages={7002-5}
}
An external-cavity diode laser operating at 1500 nm was used to record the combination band of acetylene (C(2)H(2)). By combination of wavelength-modulation spectroscopy with a noise-canceler detection circuit, a minimum detectable absorbance of 4.8 × 10(-4) with a 300-ms time constant was achieved, although this result was limited by étalon fringes. When combined with this detection technique, continuous, widely tunable output from an external-cavity laser is ideally suited for high-resolution… CONTINUE READING

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