Atomic frequency standard with resonance cell within cavity resonator - uses phase detector to control FM microwave oscillator exciting cell, laser diode as pump light source and photocell to intercept laser beam passing through cell

摘要

The laser beam (7) from the diode (6) is split into two beams (9,10) of different intensity. A first photocell (11) connected to the frequency control circuit receives one of these beams (9). A first phase detector (13) is connected to this photocell (11). A second photo cell (12) connected to a second phase detector (14) receives the other beam (10). The output of the first phase detector (13) controls the f.m. microwave oscillator (3). A signal to control the frequency of the laser diode (6) for min. light-shift effect is produced from the output signals of the two phase detectors (13,14). ADVANTAGE - Light shift effect minimised.