Cavity-Enhanced Spectroscopy in Condensed Phases: Recent Literature and Remaining Challenges

Figure 5

(a) Experimental apparatus for fiber loop CRDS with a liquid core waveguide. (b) Data illustrating ring-down pulses with and without the waveguide being present. Without the waveguide, the round-trip loss was 11.6%. With the waveguide, the round-trip loss increased to 53.9% (c) Data illustrating recorded ring-down time over the course of an experiment in which 20 μL plugs of absorbing dye in the nM concentration range were sequentially injected into the waveguide. Top trace in (c) is for Allura red and bottom trace is for Congo red dye. Figures have been adapted from Bescherer et al. [31]. Copyright 2013 American Chemical Society.

(a)

(b)

(c)