| In recent years,the frequency stability of atomic clocks and ultra-stable lasers has become better and better.The frequency stability of ultra-stable lasers has achieved the stability of 10-16,and the accuracy of optical clocks has even reached an accuracy of 10-19.The method of high-precision frequency transfer has become an urgent problem to be solved.Optical fiber communication shows the advantages of low loss and low noise,so the optical fiber link is very suitable for transmitting ultra-stable frequency signals.In addition,compared with the transfer of microwave frequency signals,the transfer of optical frequency signals has higher stability.Optical frequency transfer using optical fiber link can meet a wide range of applications.This thesis mainly focuses on the requirement of the Precision Gravity Measurement Facility(PGMF)project at Huazhong University of Science and Technology(HUST)to carry out the optical frequency transfer via fiber links.The main contents of the research are as follows:Designed and built a free-space optical frequency transfer noise compensation system operating at a wavelength of 1070 nm.By optimizing the asymmetry of the interference arms and adopting a multi-layer seal design,the frequency stability curve of the in-loop and out-loop background noise is nearly the same after phase locking,and both frequency noises decrease with a linear slope of3.5?10-1 8/?.In addition,in order to practically use the transfer system,the optical frequency transfer was carried out on a fiber link connecting the Center for gravitational experiments(CGE)building and the cave laboratory of the CGE with a fiber length of about 1 km.After phase noise compensation,the obtained frequency stability of the in-loop is3.1?10-1 8@1s,1.0?10-19@1000s,and the frequency stability of out-loop is4.2?10-1 8@1s,3.1?10-19@1000s.It can meet the requirements of transferring the ultra-stable laser at a frequency stability of 10-16 to different laboratories of the CGE.In order to build a robust and easy-to-handle integrated optical frequency long-distance transfer system,an optical frequency transfer noise compensation system based on all-fiber configuration was studied and designed.The size of the system is 33cm×25 cm×5 cm.Using this system to carry on the optical frequency transfer on the 1km fiber link,the in-loop frequency stability reaches2.9?10-1 8@1s,1.1?10-19@1000s,and the out-loop frequency stability is 6.8?10@1s,2.3?10-18@1000s after noise-17 compensation.This result can meet the requirements of high-precision laser signal transfer for the PGMF project. |
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