Fig. 2.

(a) Spectrum of the three-wavelength stimulated-Raman-scattering laser. (b) Absorption saturation effect with different axial resolutions and absorption coefficients. (c) Impact of absorption saturation effect on sO₂ accuracy using linear method. The nonlinear sO₂ results is the same as the set values. The tilted dashed line represents an ideal case that the linear sO₂ results are unbiased. (d) In vitro sO₂ measurement of bovine blood samples using both linear and nonlinear models. Sample size = 5.