SYSTEM TO STABILISE FREQUENCY OF LASER RADIATION Russian patent published in 2011 - IPC H01S3/10 

FIELD: electricity.

SUBSTANCE: device comprises a controller connected with its output to an input of a stabilised laser, and a generator, and also the first beam splitter arranged in a bundle of radiation of the stabilised laser. Downstream the beam splitter there are the following serially installed components: a reference, the first photodetector and the first detector. The device comprises the second beam splitter, having two channels, and installed in the radiation bundle of the stabilised laser downstream the first beam splitter. The modulator is installed between the first and the second beam splitters, and is connected with its input to the generator's output. The second photodetector is installed serially, as well as the second detector and a differential amplifier. The output of the first photodetector and the output of the second photodetector are connected via a differential amplifier with the controller's input. The input of the second channel of the second beam splitter is connected to the output of the first beam splitter, and output of each of channels of the second beam splitter is optically connected with the input of one photodetector directly, and via the reference to the input of the other photodetector.

EFFECT: increased accuracy of medium radiation frequency stabilisation without rise in high-frequency deviations of this frequency.

2 cl, 4 dwg