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VIRGO_LCGT Meeting Laser & Mirror

VIRGO_LCGT Meeting Laser & Mirror. 5 November, 2010 Norikatsu Mio. Schematic View of LCGT Optical System. ETMY. Laser. MC1. MC3. ITMY. MT1. PRM. PR1. 780 W. ITMX. ETMX. 150 W. 75 W. MT2. BS. PR2. SR1. MC2. SRM. SR2. Laser for LCGT. Injection Locked laser Master: 2-W NPRO

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VIRGO_LCGT Meeting Laser & Mirror

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  1. VIRGO_LCGT MeetingLaser & Mirror 5 November, 2010 Norikatsu Mio

  2. Schematic View of LCGT Optical System ETMY Laser MC1 MC3 ITMY MT1 PRM PR1 780 W ITMX ETMX 150 W 75 W MT2 BS PR2 SR1 MC2 SRM SR2

  3. Laser for LCGT Injection Locked laser Master: 2-W NPRO Slave: Mitsubishi Power Amplifier PZT QWP Nd:YAG rod Intensity stabilization （Injection Current Control） quartz rotator High-Power Laser Modules Mitsubishi WB-EOM 150W BW PBS EOM FI 2W FI 100W 10 kHz < f < 1 MHz WB-EOM Nd:YAG NPRO PD f < 10 kHz PZT, Crystal Temp. Frequency Stabilization

  4. Laser • Basic design has been tested with a prototype laser. • Discussion with Mitsubishi that makes laser modules for LCGT. • We will buy laser modules from Mitsubishi and assemble a laser system from them by ourselves or by another company. • Alternative choice? • Commercial fiber laser: 40W

  5. Alternative design Mitsubishi laser modules 200 W 80 W Fiber laser amplifiers 40 W NPRO(500mW) 40 W

  6. Mirrors for 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 Size of these mirrors must be determined according to the design policy of the interferometer.

  7. Mirror • Size of the mirrors for main cavities was determined as f25cm x t10cm in order to make full use of the iLIGO mirror substrates. • Size of the beam splitter is f38cm x t12cm. The substrate will be prepared within this year. • Concerning polishing and coating, several companies inquired the situations. • We need to develop a new coating machine for large mirrors. Some Japanese companies may collaborate with us; this issue is under consideration. • Polish: Collaboration with Riken Group • Details are not fixed.

  8. 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.

  9. Sapphire • We need a C-axis mirror(f25cm x t15cm). • Reply from GT Crystal systems • Current Max size of • C-axis mirror: f20cm x t15cm • A-Plane mirror: f25cm x t15cm • “With time we feel can develop larger C-axis sapphire slabs to achieve your goal of 25cm x 15cm sapphire mirrors with our HEM growth process.” • Inquiring • when we can obtain C-axis mirror of f20cm x t15cm? • price and delivery time of max size of C-axis mirror(f20cm x t15cm) and A-Plane mirror (f25cm x t15cm). • No answer (the quotations will be made in this week!).

  10. appendix

  11. Laser module （Mitsubishi） Diffusive reflector +LD Two rods and rotator

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