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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. 10 th LISA Symposium Gainesville , May 1 9- 23, 201 4.

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Gang Jin, Yuqiong Li, Yuhui Dong, Heshan Liu, Ziren Luo

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  1. 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 Symposium Gainesville, May 19-23, 2014

  2. Contents • Motivation • Introduction to SLI • Constitution • Key technologies • SLI development in IMECH • Phase-meter • Prototype of SLI • Beam pointing control • Phase locking • Summary & outlooks

  3. Motivation----detect G.W. in space Gravitational 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 110 pm Pioneer mission LISA (eLISA) • LISA type missions • BBO • DECIGO • ALIA • Chinese proposal (10mHz-1Hz)

  4. Detecting G.W. in space ----A bite of China IMRIs and binary of B.H.s formed by Pop III stars[1] 2008 Independent proposal collaboration of space laser interferometer G.W. detection between CAS and ESA Technology demonstration mission proposed, building prototypes 2011 Institutes of CAS, Universities, satellite companies Official Chinese space G.W. detection working group constituted 2012 2014 LISA X symposium Recent progress in China IMECH assigned to build SLI • [1] Gong, Xuefei, et al. "A scientific case study of an advanced LISA mission."Classical and Quantum Gravity 28.9 (2011): 094012.

  5. Introduction to SLI ----constitution Heterodyne detection & non-Gaussian profile weak light phase lock 20MHz, 10pw, top-hat beam profile, locking precision S.C.2 S.C.1 Million Kilometers

  6. Introduction to SLI ----constitution • Hardware: • Laser, pre-stabilized to ; • Interferometer, , ; • Telescope, , ; • Phase meter, ; • Pointing ahead angle mechanism.

  7. Introduction to SLI ----key technologies Shot noise Big telescope, high laser power [1] Laser frequency noise Pre-stabilization, arm-locking, TDI [2] Clock jitter noise Sideband-sideband scheme [3] Pointing jitter noise Pointing control techniques [1] Data pre-processing and etc. Clock sync., ranging & laser comm. [1, 4] [1] DanzmannK, Bender P, Brillet A, et al. LISA pre-phase A report[J]. Max-Planck-Institut fur Quantenoptik, Report MPQ, 1998, 208. [2] SheardB 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. [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.

  8. Introduction to SLI ----to summarize

  9. SLI development in IMECH ---- A brief introduction Funded by national space science center Methodological demonstration: homodyne V.S. heterodyne [1] 2010 Funded by Chinese Academy of Science building hardware, prototype testing, technology development 2012 LISA X symposium 2014 Recent status [1] Yu-QiongL, Zi-Ren L, He-Shan L, et al. Chinese Physics Letters, 2012, 29(7): 079501.

  10. SLI development in IMECH ---- the interferometer • Chinese space G.W. detector • technology demonstration mission • Chinese counterpart of LISA pathfinder • Interferometer prototype Noisy laser source: worse than 1MHz/√Hz Achieve 100pm/√Hz, thermal noise dominates Polarizing interferometer Rectangular and straightforward Fewer component Equal arm-length

  11. SLI development in IMECH ---- the phase meter Based on FPGA DPLL 4 channels Signal frequency 1-2MHz Output frequency >200Hz LISA Symposium X, section Interferometry and Optics, Thursday, May 22nd, 17:15-17:30

  12. SLI development in IMECH ---- the pointing control Differential Wave Sensing [1] Pointing control demonstration [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

  13. SLI development in IMECH ---- the phase locking Master laser Interferometer Phase meter Phase difference Slave laser Gaussian profile 1mW power Locking precision mrad Interferometer noise dominates

  14. Summary & outlooks

  15. Acknowledgement • With special thanks to Gerhard Heinzelfor 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, AikoSamblowski, Yan Wang and many other AEI members for their valuable helps.

  16. Thank you all

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