Laser phase noise feedforward elimination device and method based on PDH frequency stabilization technology

The invention relates to the technical field of laser noise suppression, in particular to a laser phase noise feedforward elimination device and method based on a PDH frequency stabilization technology, and the device comprises a PDH laser frequency stabilization equipment body which is used for sampling laser emitted by a laser for frequency stabilization processing; the delay light path is connected with a beam splitter of the PDH laser frequency stabilization equipment body and is used for carrying out delay processing on the laser except for sampling; the feed-forward module is connected with a low-pass filter of the PDH laser frequency stabilization equipment body and is used for performing gain processing on part of PDH error signals output by the low-pass filter; and the second electro-optical modulator is respectively connected with the delay light path and the feed-forward module, and performs phase modulation on the laser subjected to delay processing by using the gained signal so as to offset the p