公开(公告)号：US20180248333A1

公开(公告)日：2018-08-30

申请号：US15558965

申请日：2015-11-20

Applicant: KOREA ADVANCED INSTITUE OF SCIENCE AND TECHNOLOGY

Inventor： Jung Won KIM ,  Kwang Yun JUNG

IPC: H01S3/13 ,  G01J11/00 ,  H01S3/067 ,  H01S3/11 ,  H01S3/136 ,  H01S3/08 ,  H01S3/10

CPC classification number: H01S3/10053 ,  G01J11/00 ,  H01S3/00 ,  H01S3/06754 ,  H01S3/08013 ,  H01S3/094 ,  H01S3/1106 ,  H01S3/1305 ,  H01S3/1307 ,  H01S5/06246 ,  H01S5/0657 ,  H01S5/06821 ,  H01S2301/02

Abstract: Provided is a method of measuring a phase noise of a repetition rate of a femtosecond laser including generating a combined signal using a first wavelength element and a second wavelength element of an optical pulse train generated by the femtosecond laser, which is mode-locked, guiding the combined signal to a first path and a second path, allowing a signal of the second path to interfere with the signal of the first path, and outputting an interfering combined signal, dividing the interfering combined signal into a first interference signal and a second interference signal, converting the interference signals to radio frequency signals, and detecting a baseband signal including a frequency noise of the repetition rate from the radio frequency signals using a mixer.