Gang Jin, Yuqiong Li, Yuhui Dong, Heshan Liu, Ziren Luo
description
Transcript of Gang Jin, Yuqiong Li, Yuhui Dong, Heshan Liu, Ziren Luo
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