Abstract

In the field of laser-based absorption spectroscopy, off-axis integrated cavity output spectroscopy is considered to be a sensitive and robust method, employing a simple optical design. However, one of the major drawbacks of non-mode-matched cavities combined with highly reflective mirrors ($>99.98\%$) is its low output intensity. Here, we systematically investigate the increase in cavity output intensity, using a third re-injection mirror before the absorption cavity. The presented design not only enables high transmission power but also retains a long effective path length. To investigate the intensity enhancement, we used a ${\mathrm{CO}}_2$ absorption line in the near-IR wavelength region at $6240.10{\mathrm{cm}}^{-1}$. In agreement with our simulation model, we achieved an intensity enhancement factor of 38. We achieved a noise equivalent absorption sensitivity to $1.6\times {10}^{-8}{\mathrm{cm}}^{-1}{\mathrm{Hz}}^{-1/2}$, which is no longer limited by the detectivity of the detector.

© 2018 Optical Society of America

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