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Title: FPGA-Based Optical Cavity Phase Stabilization for Coherent Pulse Stacking

Coherent pulse stacking (CPS) is a new time-domain coherent addition technique that stacks several optical pulses into a single output pulse, enabling high pulse energy from fiber lasers. We develop a robust, scalable, and distributed digital control system with firmware and software integration for algorithms, to support the CPS application. We model CPS as a digital filter in the Z domain and implement a pulse-pattern-based cavity phase detection algorithm on an field-programmable gate array (FPGA). A two-stage (2+1 cavities) 15-pulse stacking system achieves an 11.0 peak-power enhancement factor. Each optical cavity is fed back at 1.5kHz, and stabilized at an individually-prescribed round-trip phase with 0.7deg and 2.1deg rms phase errors for Stages 1 and 2, respectively. Optical cavity phase control with nanometer accuracy ensures 1.2% intensity stability of the stacked pulse over 12 h. The FPGA-based feedback control system can be scaled to large numbers of optical cavities.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
  3. Tsinghua Univ., Beijing (China)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
IEEE Journal of Quantum Electronics
Additional Journal Information:
Journal Volume: 54; Journal Issue: 1; Related Information: © 1965-2012 IEEE.; Journal ID: ISSN 0018-9197
Publisher:
IEEE
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS
OSTI Identifier:
1435116

Xu, Yilun, Wilcox, Russell, Byrd, John, Doolittle, Lawrence, Du, Qiang, Huang, Gang, Yang, Yawei, Zhou, Tong, Leemans, Wim, Galvanauskas, Almantas, Ruppe, John, Tang, Chuanxiang, and Huang, Wenhui. FPGA-Based Optical Cavity Phase Stabilization for Coherent Pulse Stacking. United States: N. p., Web. doi:10.1109/JQE.2017.2775698.
Xu, Yilun, Wilcox, Russell, Byrd, John, Doolittle, Lawrence, Du, Qiang, Huang, Gang, Yang, Yawei, Zhou, Tong, Leemans, Wim, Galvanauskas, Almantas, Ruppe, John, Tang, Chuanxiang, & Huang, Wenhui. FPGA-Based Optical Cavity Phase Stabilization for Coherent Pulse Stacking. United States. doi:10.1109/JQE.2017.2775698.
Xu, Yilun, Wilcox, Russell, Byrd, John, Doolittle, Lawrence, Du, Qiang, Huang, Gang, Yang, Yawei, Zhou, Tong, Leemans, Wim, Galvanauskas, Almantas, Ruppe, John, Tang, Chuanxiang, and Huang, Wenhui. 2017. "FPGA-Based Optical Cavity Phase Stabilization for Coherent Pulse Stacking". United States. doi:10.1109/JQE.2017.2775698. https://www.osti.gov/servlets/purl/1435116.
@article{osti_1435116,
title = {FPGA-Based Optical Cavity Phase Stabilization for Coherent Pulse Stacking},
author = {Xu, Yilun and Wilcox, Russell and Byrd, John and Doolittle, Lawrence and Du, Qiang and Huang, Gang and Yang, Yawei and Zhou, Tong and Leemans, Wim and Galvanauskas, Almantas and Ruppe, John and Tang, Chuanxiang and Huang, Wenhui},
abstractNote = {Coherent pulse stacking (CPS) is a new time-domain coherent addition technique that stacks several optical pulses into a single output pulse, enabling high pulse energy from fiber lasers. We develop a robust, scalable, and distributed digital control system with firmware and software integration for algorithms, to support the CPS application. We model CPS as a digital filter in the Z domain and implement a pulse-pattern-based cavity phase detection algorithm on an field-programmable gate array (FPGA). A two-stage (2+1 cavities) 15-pulse stacking system achieves an 11.0 peak-power enhancement factor. Each optical cavity is fed back at 1.5kHz, and stabilized at an individually-prescribed round-trip phase with 0.7deg and 2.1deg rms phase errors for Stages 1 and 2, respectively. Optical cavity phase control with nanometer accuracy ensures 1.2% intensity stability of the stacked pulse over 12 h. The FPGA-based feedback control system can be scaled to large numbers of optical cavities.},
doi = {10.1109/JQE.2017.2775698},
journal = {IEEE Journal of Quantum Electronics},
number = 1,
volume = 54,
place = {United States},
year = {2017},
month = {11}
}