Laser–RF synchronization based on digital phase detector

Laser oscillator synchronization with RF reference signal is ultra-important for a modern light source based on the accelerator. For Tsinghua Thomson scattering X-ray source, we have synchronized the mode-locked laser oscillator to RF reference signal with 48.2 fs RMS relative jitter. Both fundament...

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Bibliographic Details
Published in:Nuclear science and techniques Vol. 28; no. 4; pp. 97 - 102
Main Authors: Yang, Jin, Du, Ying-Chao, Yan, Li-Xin, Huang, Gang, Du, Qiang, Xu, Yi-Lun, Huang, Wen-Hui, Chen, Huai-Bi
Format: Journal Article
Language:English
Published: Singapore Springer Singapore 01.04.2017
Lawrence Berkeley National Laboratory, Berkeley,CA 94720, USA
Key Laboratory of Particle and Radiation Imaging(Tsinghua University), Ministry of Education, Beijing 100084, China
Department of Engineering Physics, Tsinghua University,Beijing 100084, China
Key Laboratory of Particle and Radiation Imaging(Tsinghua University), Ministry of Education, Beijing 100084, China%Lawrence Berkeley National Laboratory, Berkeley,CA 94720, USA%Department of Engineering Physics, Tsinghua University,Beijing 100084, China
Subjects:
Energy
Hadrons
Heavy Ions
Laser
Nuclear Energy
Nuclear Physics
oscillator;Synchronization;RF;LLRF;Emulator
Emulator
RF
Laser oscillator
Synchronization
LLRF
ISSN:1001-8042, 2210-3147
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Summary:Laser oscillator synchronization with RF reference signal is ultra-important for a modern light source based on the accelerator. For Tsinghua Thomson scattering X-ray source, we have synchronized the mode-locked laser oscillator to RF reference signal with 48.2 fs RMS relative jitter. Both fundamental and harmonic signals derived from photo diode detection are used for laser-RF synchronization in our scheme. The fundamental signal is for coarse laser-RF synchronization and multiple laser oscillator synchronization. The harmonic signal is for high precise phase locking. The digital phase detector is implemented in the synchronization scheme for less noise, replacing the mixing to DC phase detection scheme. The digital processing algorithm for synchronization is commonly used in low-level RF control field. In order to test the phase locking loop logic without damaging the real laser oscillator,a laser oscillator emulator was developed for phase locking. This paper will report the laser-RF synchronization scheme and its performance. The laser oscillator emulator system will also be introduced here.
Bibliography:31-1559/TL
ISSN:1001-8042
2210-3147
DOI:10.1007/s41365-017-0205-z