Abstract: A device for optical gas analysis is provided, the device comprising: a gas cell for a measurement gas; a first light source, wherein the first light source is a coherent light source and is adapted to emit first light into the gas cell; a second light source, wherein the second light source is an incoherent light source and is adapted to emit second light into the gas cell; a first light sensor, wherein the first light sensor is adapted and arranged to receive the first light after passing on a first optical path through the measurement gas in the gas cell; and a second light sensor, wherein second light sensor is adapted and arranged to receive the second light after passing on a second optical path through the same measurement gas in the same gas cell. Further, a corresponding system and method for optical gas analysis are provided.