Patent ID: 8306078
Filing Date: 2012-11-06
Classification: H01S

Abstract:
1. A repetition frequency control device comprising: a slave laser that outputs a slave laser light pulse; a slave photoelectric conversion unit that receives the slave laser light pulse, and converts the slave laser light pulse into a slave electrical signal; a master laser that outputs a master laser light pulse; a master photoelectric conversion unit that receives the master laser light pulse, and converts the master laser light pulse into a master electrical signal; a frequency change unit that changes the repetition frequency of the master electric signal by a predetermined value; a phase difference detector that detects a phase difference between the slave electric signal and the output from the frequency change unit; and a loop filter that removes a high frequency component of an output from the phase difference detector, wherein: the repetition frequency of the master laser does not undergo control based on one or both of the master electric signal and the slave electric signal; and the repetition frequency of the slave laser light pulse changes according to an output from the loop filter.