Patent ID: 8120773

Claim:
A method of spectroscopic analysis of a sample, comprising: arranging the sample in a resonator cavity being capable for transmitting a plurality of cavity mode frequencies with a cavity mode frequency spacing; coupling pulsed source light into the resonator cavity, the source light including source comb frequencies with a source frequency spacing; coupling pulsed transmitted light out of the resonator cavity; and spectrally resolved detecting the transmitted light with a detector device, wherein the cavity mode frequency spacing and the source frequency spacing are detuned relative to each other, so that the transmitted light includes transmitted comb frequencies with a transmitted frequency spacing larger than the source frequency spacing, and the spectrally resolved detecting step includes collecting spectral distributions of the transmitted light in dependence on relative positions of the cavity mode frequencies and the source comb frequencies, the cavity mode frequencies and the source comb frequencies being varied relative to each other, so that the transmitted comb frequencies are varied within a predetermined spectral range of interest, and the spectral distributions of the transmitted light are collected such that different transmitted comb frequencies within the spectral range of interest are individually resolved.