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Actual Optical Parameters of the Main Interferometer

Contents

  1. Actual Optical Parameters of the Main Interferometer
    1. Optical Parameters
      1. Interferometer Diagram
      2. ITM=1.9km, ETM=1.9km, PRC=16.5deg, SRC=17.5deg, 16.875MHz, 45MHz
    2. Mirror Specs
      1. Test Masses

Optical Parameters

Interferometer Diagram

MIF Diagram

Note: In this figure POP is taken at the transmission of PR3, because it is easier to draw. In reality, POP will be taken at the transmission of PR2.

ITM=1.9km, ETM=1.9km, PRC=16.5deg, SRC=17.5deg, 16.875MHz, 45MHz

This is the parameter set chosen by the MIF group.

Lengths & Frequencies

f1

16.880962MHz (3*f2/8)

f2

45.015898MHz

f3

56.269873MHz (10*f2/8)

Larm

3000.0m

Lmc

26.639m

Lprc

66.591m

Lsrc

66.591m

Las

3.3299m

Lp1

14.7615

Lp2

11.0661m

Lp3

15.7638m

Lmi

25m

Lmx

26.6649m

Lmy

23.3351m

Ls1

14.7412m

Ls2

11.1115m

Ls3

15.7386m

Folding Angle

Folding angle is an incident angle of the beam to the folding mirrors. The angle between incoming and reflected beams is twice the folding angle.

Radius of Curvatures (Positive for concave)

ITM

1900.0m

ETM

1900.0m

PRM

458.1285m

PR2

-3.0764m

PR3

24.9165m

SRM

458.1285m

SR2

-2.9872m

SR3

24.9165m

Beam Spot Size (1/e^2 radius)

ITM

35.3mm

ETM

35.3mm

PRM

4.457mm

PR2

4.457mm

PR3

36.639mm

SRM

4.308mm

SR2

4.328mm

SR3

36.666mm

Mirror Specs

Test Masses

ITM

Diameter

220mm

Thickness

150mm

HR Radius of Curvature

1.90(+/-0.0095)km

0.5% error

AR Radius of Curvature

Flat (>100km)

As flat as possible

AR Wedge Angle

0.025+0/-0.01deg

Transmission@1064nm

0.004 +0.001/-0.0

Transmission asymmetry@1064nm

2*|(T1-T2)/(T1+T2)| < 0.01

T1 and T2 are the transmission of two ITMs

HR Loss@1064nm

<45ppm

Transmission@532nm

0.06(+0/-0.005)

Transmission of ITM must be larger than ETM@532nm

Transmission asymmetry@532nm

No requirement

HR Loss@532nm

<1%

AR Reflectivity@1064nm

200(+100/-0)ppm

AR Reflectivity@532nm

<5%

As small as possible

ETM

Diameter

220mm

Thickness

150mm

HR Radius of Curvature

1.9(+/-0.0095)km

0.5% error

AR Radius of Curvature

Flat (>100km)

As flat as possible

AR Wedge Angle

0.2+/-0.1deg

Transmission@1064nm

5ppm < T < 10ppm

Transmission asymmetry@1064nm

2*|(T1-T2)/(T1+T2)| < 0.01

Best Effort

HR Loss@1064nm

<45ppm

Transmission@532nm

0.06(+0/-0.005)

Transmission of ETM must be smaller than ITM@532nm

Transmission asymmetry@532nm

No requirement

HR Loss@532nm

<1%

AR Reflectivity@1064nm

<50ppm

AR Reflectivity@532nm

<5%

As small as possible

BS

Diameter

370mm +/- 0.25mm

Thickness

80mm +/- 0.5mm

HR Radius of Curvature

Flat (>500km)

As flat as possible

AR Radius of Curvature

Flat (>500km)

As flat as possible

AR Wedge Angle

0.08+0/-0.01deg

Incident Angle

44.9684deg +/-0.05deg

Transmission@1064nm

50% +/-1%

HR Loss@1064nm

<100ppm

Transmission@532nm

>0.9

HR Loss@532nm

<1%

AR Reflectivity@1064nm

<50ppm

AR Reflectivity@532nm

<5%

As small as possible

PRM

Diameter

250mm

Thickness

100mm

HR Radius of Curvature

458.1285m(+/-20)m

5% error

AR Radius of Curvature

Flat (>100km)

As flat as possible

AR Wedge Angle

TBD

Transmission@1064nm

0.1(+0.001/-0.0)

HR Loss@1064nm

<45ppm

AR Reflectivity@1064nm

<50ppm

PR2

Diameter

250mm

Thickness

100mm

HR Radius of Curvature

-3.0764(+/-0.01)m

AR Radius of Curvature

Flat (>100km)

As flat as possible

AR Wedge Angle

TBD

Transmission@1064nm

500ppm(+/-50ppm)

HR Loss@1064nm

<45ppm

Transmission@532nm

> 0.5

As large as possible

HR Loss@532nm

<10%

AR Reflectivity@1064nm

<1000ppm

As small as possible

AR Reflectivity@532nm

<5%

As small as possible

PR3

Diameter

250mm

Thickness

100mm

HR Radius of Curvature

24.9165(+/-0.01)m

AR Radius of Curvature

Flat (>100km)

As flat as possible

AR Wedge Angle

TBD

Transmission@1064nm

<50ppm

As small as possible

HR Loss@1064nm

<45ppm

Transmission@532nm

< 0.1

As small as possible

HR Loss@532nm

<10%

AR Reflectivity@1064nm

<1000ppm

As small as possible

AR Reflectivity@532nm

<5%

As small as possible

SRM

Diameter

250mm

Thickness

100mm

HR Radius of Curvature

458.1285m(+/-20)m

5% error

AR Radius of Curvature

Flat (>100km)

As flat as possible

AR Wedge Angle

TBD

Transmission@1064nm

0.1536(+/-0.001)

HR Loss@1064nm

<45ppm

AR Reflectivity@1064nm

<50ppm

SR2

Diameter

250mm

Thickness

100mm

HR Radius of Curvature

-2.9872(+/-0.01)m

AR Radius of Curvature

Flat (>100km)

As flat as possible

AR Wedge Angle

TBD

Transmission@1064nm

500ppm(+/-50ppm)

HR Loss@1064nm

<45ppm

Transmission@532nm

> 0.5

As large as possible

HR Loss@532nm

<10%

AR Reflectivity@1064nm

<1000ppm

As small as possible

AR Reflectivity@532nm

<5%

As small as possible

SR3

Diameter

250mm

Thickness

100mm

HR Radius of Curvature

24.9165(+/-0.01)m

AR Radius of Curvature

Flat (>100km)

As flat as possible

AR Wedge Angle

TBD

Transmission@1064nm

<50ppm

As small as possible

HR Loss@1064nm

<45ppm

Transmission@532nm

< 0.1

As small as possible

HR Loss@532nm

<10%

AR Reflectivity@1064nm

<1000ppm

As small as possible

AR Reflectivity@532nm

<5%

As small as possible

LCGT/subgroup/ifo/MIF/OptParam (last edited 2021-12-22 14:33:51 by YoichiAso)