Fig. 2: BS-IDT system performance.
a Dependence of MIP-induced RI changes on mid-IR laser power and the linear fitting curve with a slope of 7.7 × 10−5. b MIP-induced RI changes and relative RI change with respect to the pump-probe time delay variations. Relative RI variation is obtained by dividing the RI change over the maxima. The red fitting curve shows an exponential temporal decay constant of ~20 µs. c Spectral fidelity of BS-IDT validated by the standard FTIR spectrum of the same specimen. Sample: soybean oil film.
