Abstract
Absorption spectra of water vapor are recorded by intracavity laser spectroscopy (ILS) using a multimode Cr 4+: YAG laser operating in the 1.38–1.55 μm spectral region. The most prominent water absorption features examined appear near 1.463 μm and are assignable to several rotational transitions in the λ 1 + 2λ 2 overtone band. The observed optical properties of the 1.463 μm water absorption bands (e.g., the dependence of band intensity on the effective optical pathlength or generation time) are consistent with those expected for intracavity measurements with a multimode, homogeneously broadened ILS laser such as a broadband dye laser. These data demonstrate the applicability of the tunable, solid-state Cr 4+: YAG laser for the high sensitivity detection of weak absorption in the near-infrared region via ILS techniques.
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