Fig. 1. Schematic of CRDS and optical ring-down

Fig. 2. Overall experimental system

Fig. 3. Burner

Fig. 4. Measurement results of CRDS system with 2C-LII system on and off. (a) Path-integrated attenuation coefficient; (b) linear fitting

Fig. 5. Measurements results of 2C-LII system with CRDS system on and off. (a) Path-integrated attenuation coefficient; (b) linear fitting

Fig. 6. Path-integrated attenuation coefficient versus HAB

Fig. 7. Fitting results and residuals of CRDS system ring-down time with hHAB=35 mm. (a) Cavity ring-down signal fitting result under single-exponential fitting model; (b) fitting residual of cavity ring-down signal under single-exponential fitting model; (c) cavity ring-down signal fitting result under multi-exponential fitting model; (d) fitting residual of cavity ring-down signal under multi-exponential fitting model