In my studies I make use of the OFCs for precise measurements, to determine which of the generated frequencies (colors, or the “comb’s teeth”) and to what extent it is absorbed by the molecular gas under study. It allows to obtain information on the particles’ internal structure and dynamics, as well as their interactions with other particles or atoms in the gas. Using this technique is not limited to basic research. Since each molecule has its specific absorption spectroscopy- a kind of “fingerprint” (which means one and unique way of absorbing light), the measurement in a wide range of colors makes it possible to define how many and what kind of particles we have in a studied gas sample. It allows for extremely precise detection of numerous substances at once, even if their concentration is very low (less than one molecule of the searched substance to a billion of other particles in a sample!). It can be used in climate study, monitoring pollution, managing production processes, detecting hazardous substances or medical diagnosis.