Multipoint optical measuring device, and associated use and method

A multipoint optical measuring device comprising:

• a source for emitting laser pulses;
• at least two splitting modules intended to be passed through by said pulses and to split an incident laser beam into several parallel beams;
• at least one converging lens interposed between the source and the splitting module;
• a measuring zone that is intended to receive a medium or sample to be measured and that is located in a focal plane of said converging lens, wherein each splitting module comprises, on the one hand, a first uniaxial birefringent crystal and, on the other hand,
• a second identical crystal placed after the first crystal on the path of the pulses, the first birefringent crystal being configured to split an incident laser beam into an ordinary secondary beam and an extraordinary secondary beam, the second birefringent crystal being oriented with respect to the first crystal so that the extraordinary secondary beam from the laser beam passes through an ordinary path of the second birefringent crystal, and that the ordinary secondary beam from the laser beam passes through an extraordinary path of the second birefringent crystal, the pulses of the beams output from the modules reaching simultaneously and at multiple points the medium or sample to be measured.