| 摘要 |
PURPOSE:To obtain a light frequency stabilizing device which is operable with high accuracy in spite of the temperature fluctuation by a method wherein two FPEs are used indicating the plus and minus change rate for the temperature fluctuation. CONSTITUTION:The light LT1 from an FPE14 which has the light output according to the frequency fluctuation is applied to the first light detector (DET1)15, and is transformed to the first electric signal E1. Said signal E1 goes to an adder 17 through a comparator 16. In the meanwhile, the reflected light LT2 from a beam splitter 13 is received to the second light detector 18, and is transformed to the second electric signal E2 equivalent to the fluctuation component of the light output, and the output followed purely only to the fluctuation of the frequency by a comparator 16, is negative feedbacked to a laser 11. Besides, in this case, another one FPE31 which has the quality contrary to that of the FPE14 is inserted at the light path of the light LT2. |
