Fig. 1. Diagram of noise suppression system

Fig. 2. (a) Variation of output noise with feedback gain; (b) Spectrogram of photoelectric negative feedback noise suppression

Fig. 3. Schematic diagram of the two-mirror cavity light fields

Fig. 4. Spectral diagram of mode cleaner noise suppression

Fig. 5. (a) Spectral diagram of system noise suppression; (b) Noise suppression effect in different modes

Fig. 6. Intensity noise spectrum of laser under different noise suppression modes