Reduction of optical interference signals by means of vibratory movements of optically active elements of a spectrometer

A spectrometer comprising:

• a laser light source configured to generate coherent radiation, including a tunable diode laser with a coherent laser output, wherein the laser light source is configured to modulate the frequency of the coherent laser output;
• a photodetector arranged to receive an optical signal from the laser output after traversing a path length;
• at least one optical element arranged along the path length between the laser output and the photodetector, wherein the at least one optical element includes at least one optically effective surface;
• and
• an evaluation unit electrically connected to the photodetector and configured to receive an electrical signal from the photodetector, to analyze the electrical signal, and to transmit instructions to a controller electrically connected to the evaluation unit, wherein
• the laser light source and/or the at least one optical element is mounted on a movable carrier, wherein the carrier is moved by a drive driven by the controller via control signals, wherein the movement of the carrier is an oscillatory movement with an amplitude and/or frequency and changes the path length of the radiation such that interference signals which arise on the at least one optical element as optical interference due to the superposition of rays of different optical path lengths by the at least partial reflection on at least one optical surface are suppressed, wherein the suppression is effected by interference between the radiation emitted from the light source and the change in the path length of the beam path due to the movement on the movable carrier.