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Development of crystalline mirrors for high precision measurements of space and time

Research Project

Project/Area Number 26610073
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Flaminio Raffaele  国立天文台, 重力波プロジェクト推進室, 特任教授 (10723108)

Co-Investigator(Renkei-kenkyūsha) Ueda Akitoshi  国立天文台, 光赤外研究部, 助教 (30332159)
Tatsumi Daisuke  国立天文台, 重力波プロジェクト推進室, 助教 (70333276)
Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
KeywordsCoatings / Crystals / Absorption / Scattering
Outline of Final Research Achievements

High precision measurements of distances, time or frequency, use high finesse optical cavities. Their sensitivity are limited by the mirror thermal noise. The purpose of this research has been to develop new mirrors based on crystalline coatings in order to decrease the thermal noise. First we investigated possible materials and deposition techniques through discussions with laboratories and industries working in the field of crystal coatings growth. We then have produced and characterized several samples made of GaAs/AlAs multilayers coatings deposited on GaAs wafers. Finally we have produced and characterized a two inches mirror made of a GaAs/GaAlAs coating deposited on a sapphire substrate. Despite a few defects, the final mirror has a very low roughness (<1 A) and a very small optical scattering (<6ppm).

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (3 results)

All 2016 2015 Other

All Int'l Joint Research (1 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Acknowledgement Compliant: 1 results) Presentation (1 results)

  • [Int'l Joint Research] CNRS - LMA/CNRS - LPN(France)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] Mechanical loss in state-of-the-art amorphous optical coatings2016

    • Author(s)
      Granata, M; Saracco, E; Morgado, N; Cajgfinger, A; Cagnoli, G; Degallaix, J; Dolique, V; Forest, D; Franc, J; Michel, C; Pinard, L; Flaminio, R
    • Journal Title

      Physical Review D

      Volume: 93 Issue: 1 Pages: 12007-12007

    • DOI

      10.1103/physrevd.93.012007

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] R&D to improve the KAGRA sensitivity2015

    • Author(s)
      Daisuke Tatsumi, Yoichi Aso, Kentaro Somiya, Roman Schnabel and Raffaele Flaminio
    • Organizer
      Japan Physical Society
    • Place of Presentation
      Osaka City University, Osaka, Osaka
    • Year and Date
      2015-09-25
    • Related Report
      2015 Annual Research Report

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Published: 2014-04-04   Modified: 2017-05-10  

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