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Development of laser interferometer prototype used for satellite-to-satellite displacement measurement. Gang Jin, Yuqiong Li, Yuhui Dong, Heshan Liu, Ziren Luo. Institute of Mechanics, Chinese Academy of Science, Beijing, 100190. 10 th LISA Symposium Gainesville , May 1 9- 23, 201 4. - PowerPoint PPT Presentation
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Development of laser interferometer prototype used for satellite-to-satellite
displacement measurement
Gang Jin, Yuqiong Li, Yuhui Dong, Heshan Liu, Ziren Luo
Institute of Mechanics, Chinese Academy of Science, Beijing, 100190
10th LISA SymposiumGainesville, May 19-23, 2014
Contents• Motivation• Introduction to SLI
Constitution Key technologies
• SLI development in IMECH Phase-meter Prototype of SLI Beam pointing control Phase locking
• Summary & outlooks
Motivation----detect G.W. in spaceGravitational Wave (G.W.)direct prediction of general relativity
Low frequency G.W. sources (0.1mHz-1Hz):• Binary of super mass black holes• Extreme mass ratio in-spirals• Intermediate mass ratio in-spirals• Binary of compact objects • ……
Go to space to avoid seismic noise
Pioneer mission LISA (eLISA)LISA type missions• BBO• DECIGO• ALIA• Chinese proposal (10mHz-1Hz)
110 pm
Detecting G.W. in space----A bite of China
2008
2011
2012
2014
Independent proposal
[1] Gong, Xuefei, et al. "A scientific case study of an advanced LISA mission."Classical and Quantum Gravity 28.9 (2011): 094012.
IMRIs and binary of B.H.s formed by Pop III stars[1]
collaboration of space laser interferometer G.W. detection between CAS and ESA
Technology demonstration mission proposed, building prototypes
Official Chinese space G.W. detection working group constituted
LISA X symposium
IMECH assigned to build SLI
Institutes of CAS, Universities, satellite companies
Recent progress in China
Introduction to SLI----constitution
S.C.1 S.C.2
Million Kilometers
Heterodyne detection & non-Gaussian profile weak light phase lock
20MHz, 10pw, top-hat beam profile, locking precision
Introduction to SLI----constitution
Hardware:• Laser, pre-stabilized to ;• Interferometer, , ;• Telescope, , ;• Phase meter, ;• Pointing ahead angle mechanism.
Introduction to SLI----key technologies
Shot noise
Laser frequency noise
Clock jitter noise
Pointing jitter noise
Big telescope, high laser power [1]
Pre-stabilization, arm-locking, TDI [2]
Sideband-sideband scheme [3]
Pointing control techniques [1]
[1] Danzmann K, Bender P, Brillet A, et al. LISA pre-phase A report[J]. Max-Planck-Institut fur Quantenoptik, Report MPQ, 1998, 208.
[2] Sheard B S, Gray M B, McClelland D E, et al. Laser frequency stabilization by locking to a LISA arm[J]. Physics letters A, 2003, 320(1): 9-21. Tinto M, Estabrook F B, Armstrong J W. Time-delay interferometry for LISA[J]. Physical Review D, 2002, 65(8): 082003.[3] Shaddock D A. Space-based gravitational wave detection with LISA[J]. Classical and Quantum Gravity, 2008, 25(11): 114012.
Data pre-processing and etc.
Clock sync., ranging & laser comm. [1, 4]
[4] Esteban J J, García A F, Barke S, et al. Experimental demonstration of weak-light laser ranging and data communication for LISA[J]. Optics express, 2011, 19(17): 15937-15946.
Introduction to SLI----to summarize
Methodology • Heterodyne detection• Top-hat beam profile weak light phase lock
Hardware• Stable laser source• Ultra stable interferometer• Ultra stable telescope• High precision phase meter• Pointing ahead angle mechanism
Key technique
• Arm-locking• TDI• USO noise cancellation scheme• Pointing control techniques• Clock synchronization• Laser ranging• Interferometeric laser communication
SLI development in IMECH---- A brief introduction
2010
2012
2014
Funded by national space science center
Methodological demonstration: homodyne V.S. heterodyne [1]
Funded by Chinese Academy of Science
building hardware, prototype testing, technology development
LISA X symposium Recent status
[1] Yu-Qiong L, Zi-Ren L, He-Shan L, et al. Chinese Physics Letters, 2012, 29(7): 079501.
SLI development in IMECH---- the interferometer
• Chinese space G.W. detector• technology demonstration
mission Chinese counterpart of LISA pathfinder • Interferometer prototype
Polarizing interferometerRectangular and straightforward Fewer componentEqual arm-length
Noisy laser source: worse than 1MHz/√HzAchieve 100pm/√Hz, thermal noise dominates
SLI development in IMECH---- the phase meter
Based on FPGADPLL4 channelsSignal frequency 1-2MHzOutput frequency >200Hz
LISA Symposium X, section Interferometry and Optics, Thursday, May 22nd, 17:15-17:30
SLI development in IMECH---- the pointing control
Pointing control demonstration
Differential Wave Sensing [1]
[1] Morrison E, Meers B J, Robertson D I, et al. Automatic alignment of optical interferometers[J]. Applied Optics, 1994, 33(22): 5041-5049.
LISA Symposium X, Poster Session Tuesday, May 20th, 15:45-17:30
SLI development in IMECH---- the phase locking
Master laser
Slave laser
Interferometer Phase meterPhase
difference
Gaussian profile1mW powerLocking precision mrad
Interferometer noise dominates
Summary & outlooks
Methodology • Heterodyne detection• Top-hat beam profile weak light phase lock
• A• N
Hardware• Stable laser source• Ultra stable interferometer• Ultra stable telescope• High precision phase meter• Pointing ahead angle mechanism
• N• A• N• A• N
Key technologies
• Arm-locking• TDI• USO noise cancellation scheme• Pointing control techniques• Clock synchronization• Laser ranging• Interfermeteric laser communication
• N• N• N• A• N• N• N
• With special thanks to Gerhard Heinzel for his endless help in almost everything of interferometer development;
• Thanks to Doc. Marina for her help of interferometer building;
• Thanks to Doc. Vitali for teaching us using IFOCAD;
• Thanks to Doc. Simon for sharing noise hunting experience;
• We also own many thanks to Albrecht Ruediger, Aiko Samblowski, Yan Wang and many other AEI members for their valuable helps.
Acknowledgement
Thank you all