PRODUCTION OF AN OPTICAL FREQUENCY REFERENCE SIGNAL

摘要

The production of optical frequency reference signals by means of laser diodes and atomic transition of a diluted gas, e.g. krypton isotope 84, is known. However to do this a frequency which does not lie within the ITU table of frequency allocation is produced. In order to produce a frequency reference signal of a desired frequency, a signal is produced by a second laser diode and superimposed with the first frequency reference signal to produce a differential frequency in the microwave range. A control signal derived from the differential frequency regulates the second injection laser diode with the precision of atomic krypton isotope transition.