| 摘要 |
PURPOSE:To conduct the switching and stabilization of outgoing-beam frequency from a laser device simultaneously by using two high and low finesse optical resonators as frequency discriminating elements at the same time and each employing the high resonator for stabilizing frequency and the low resonator for selecting frequency. CONSTITUTION:Outgoing beams from a laser 1 are applied to an optical branch equipment 4 through an isolator 2 and an optical fiber 3 and divided into three optical paths, and outgoing beams from the first optical path 19 are changed into an electric signal by a first photodetector 5 and used as the denominator inputs of first and second dividing circuits 6, 7 at post steps. Outgoing beams from the second optical path 20 are passed through an optical waveguide ring resonator 8 and converted into an electric signal by a second photodetecting section 9, and employed as the numerator input of the second dividing circuit 7 at the post step. Outgoing beams from the third optical path 21 are passed through a Fabry-Perot resonator 10 and turned into an electric signal by a third photodetector 11, and used as the numerator input of the first dividing circuit 6 at the post step. Outputs from the circuits 6 and 7 are compared with variable reference voltage by each employing differential amplifiers 12 and 13, and a differential signal is brought to zero and input to a laser drive circuit 14. |
