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Development and Fabrication of Beam Splitters and Mirrors for LCGT by CSIRO

This document outlines plans for the fabrication of beam splitters (BS) and temperature mirrors (TMs) for the Large-scale Cryogenic Gravitational Wave Telescope (LCGT). Key aspects include the transition from room temperature silica mirrors to cryogenic sapphire mirrors, designed for low seismic noise environments. The collaboration involves CSIRO in Lindfield, Australia, focusing on specifications, quotes, contracts, and delivery schedules. Discussion points include the size, power requirements, and the potential for introducing new fabrication techniques.

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Development and Fabrication of Beam Splitters and Mirrors for LCGT by CSIRO

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  1. BS and Mirrors for the LCGT Norikatsu Mio, PSC Univ. of Tokyo Eiichi Hirose, ICRR Univ. of Tokyo December 13, 2011 CSIRO, Lindfield Australia

  2. LCGT 1st stage: Room-temp. Operation → Silica TM (ITM and ETM) 2nd stage: CryogenicOperation → Sapphire TM ETMY • Underground • Low seismic noise • Cryogenic mirrors and suspensions • Reduction of thermal noise ITMY PRM MC BS ETMX ITMX SEM Laser Gifu Tokyo We would like to discuss possibility that CSIRO fabricates BS and possibly silica TMs CSIRO, Lindfield AUSTRALIA

  3. Overview of LCGT mirrors • iLCGT • Room temperature • Silica mirrors • Modest laser power(<10W?) • Limited time for construction • bLCGT • Cryogenic system • Sapphire mirrors • High power laser • Recycling system CSIRO, Lindfield AUSTRALIA

  4. Core optics of LCGT ETMY f10cm Mirrors for Main cavities Initial: Silica Final: Sapphire Laser MC1 MC3 ITMY MT1 PRM PR1 ITMX ETMX MT2 BS PR2 SR1 MC2 f38cm SRM SR2 f 25cm CSIRO, Lindfield AUSTRALIA

  5. Requirement s for iLCGT mirrors • iLCGT • Room temperature • Silica mirrors • Modest laser power(<10W?) • Limited time for construction • Size of themirrors for the main interferometer • 25cm in diameter 10cm in thickness • Most of them will be made from iLIGO mirrors CSIRO, Lindfield AUSTRALIA

  6. Current Plan For iLCGT, the size of the mirrors is chosen as that of iLIGO’s mirror. BS and ITMs will be newly fabricated from Japanese Silica. We have obtained some of the iLIGO mirrors. CSIRO, Lindfield AUSTRALIA

  7. Beam Splitter CSIRO, Lindfield AUSTRALIA

  8. ITM CSIRO, Lindfield AUSTRALIA

  9. ETM CSIRO, Lindfield AUSTRALIA

  10. Schedule • BS • Delivery: March, 2013 • Contract: February or March, 2012 ? • Arm Mirrors • Delivery: March, 2014 (?) • Contract: some day in 2013 (?) or 2012?? Formal budget will be funded by the end of FY2012 (March, 2013); the extension is maybe possible. CSIRO, Lindfield AUSTRALIA

  11. Things to be discussed • Specification (both BS and TMs) • Quotation (delivery date, cost etc) • Contract • (representative in Japan, deposit etc) • Any other items CSIRO, Lindfield AUSTRALIA

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