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We report on metrological-grade saturated absorption spectroscopy of CHF3 at 8.63 μm based on CW distributed-feedback QCL laser and a mid-IR self-frequency referenced optical comb. The experimental setup for the saturation spectroscopy of CHF3 is shown in Fig. 1. A CW DFB-QCL with a maximum output power of ∼40 mW tunable in the wavelength range from 8.55 to 8.65 μm, in coincidence with the us (asymmetric...
The photoexcitation dynamics in CH3NH3PbI3 thin films has been studied by nanosecond time-resolved photoluminescence (PL) and transient photoinduced absorption. Under excitation intensity from ∼0.1 to ∼100 μJ/cm2, free carrier is the dominant photoexcitation species. However, in the intermediate excitation intensity from ∼1 to ∼10 μJ/cm2, a small fraction of photoexcitations are excitons, which, however,...
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