STUDY ON THE INFLUENCE OF OPTICAL FILTER IN FREQUENCY STABILITY OF RUBIDIUM ATOMIC FREQUENCY STANDARD

A 30 nm bandwidth of band pass filiter was designed and fabricated for restraining the scattering light and increasing the ratio Signal to Noise（S/N）.The test results show that the short term frequency stability has been evidently improved.The dropping reason of long term frequency stability was analysed and several improved approach was gived.