| 摘要 |
A technique for stabilizing a gas laser to a frequency standard, and more particularly to the use of a phase lock loop in which the laser and its power supply are disposed, with the output of the laser being arranged to be compared with a multiplied frequency standard. In this invention the laser output is mixed with the multiplied frequency standard in a mixer, with the beat frequency from the mixer being compared to a radio frequency reference in a phase detector. The output of the phase detector is sent to a current controller which varies the laser power supply current, thus selectively changing the frequency of the laser. If the laser fluctuates in phase, a control signal brings the beat frequency signal back in phase with the reference input to the phase detector. As a result, a hydrogen cyanide laser phase locked in accordance with this invention has produced an output signal whose beat is less than 50 Hz wide, with a long term stability of less than 10 Hz.
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