A developed spectrometer based on optical-feedback cavity ring-down
spectroscopy (OF-CRDS) has been demonstrated with a distributed feedback laser diode
and a V-shaped glass ceramic cavity. The laser is coupled to the V-shaped cavity,
which creates an absorption path length greater than 2.8 km, and resonance between
the laser frequency and the cavity modes is realized by modulating the cavity length
instead of tuning the laser wavelength to obtain a higher resolution. A
noise-equivalent absorption coefficient of ∼2.6 × 10<sup>−8</sup>
cm<sup>−1</sup>Hz<sup>−1/2</sup> (1σ) is determined with spectral resolution of
∼0.003 cm<sup>−1</sup> and spectral range of 1.2 cm<sup>−1</sup>. As an application
example, the absorption spectrum measurement of water vapor in the spectral range of
6590.3∼6591.5 cm<sup>−1</sup> is demonstrated with this spectrometer.
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