Virgo lcgt meeting laser mirror
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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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Virgo lcgt meeting laser mirror

VIRGO_LCGT MeetingLaser & Mirror

5 November, 2010

Norikatsu Mio


Schematic view of lcgt optical system

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

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


Laser

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


Alternative design

Alternative design

Mitsubishi laser modules

200 W

80 W

Fiber laser amplifiers

40 W

NPRO(500mW)

40 W


Mirrors for lcgt

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.


Mirror

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.


Current plan

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.


Sapphire

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!).


Appendix

appendix


Laser module mitsubishi

Laser module (Mitsubishi)

Diffusive reflector +LD

Two rods and rotator


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