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{{attachment:MIF-diagram.png|MIF Diagram|width=800}} {{attachment:MIF-diagram.png|MIF Diagram|width="800"}}
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----
=== g1=-0.7857, g2=-0.6043, 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 ||||<style="text-align:center"> ||
||Lprc ||66.591m ||Lsrc ||66.591m ||Las ||3.3299m ||
||Lp1 ||14.7606 ||Lp2 ||11.0669m ||Lp3 ||15.7638m ||
||Lmi ||25m ||Lmx ||26.6649m ||Lmy ||23.3351m ||
||Ls1 ||14.7606m ||Ls2 ||11.0669m ||Ls3 ||15.7638m ||
||Folding angle ||0.6860[deg] ||||||||<style="text-align:center"> ||


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 ||1680.0m ||ETM ||1870.0m ||||<style="text-align:center"> ||
||PRM ||303.96m ||PR2 ||-2.7628m ||PR3 ||24.574m ||
||SRM ||303.96m ||SR2 ||-2.7764m ||SR3 ||24.584m ||


==== Beam Spot Size (1/e^2 radius) ====
||ITM ||35.064mm ||ETM ||39.983mm ||||<style="text-align:center"> ||
||PRM ||4.030mm ||PR2 ||4.030mm ||PR3 ||36.479mm ||
||SRM ||4.031mm ||SR2 ||4.031mm ||SR3 ||36.327mm ||


==== Lens effect (effective focal length seen from the AR side) ====
||ITM (Sapphire) ||>666km ||
||PRM (Silica) ||>10000km ||


----
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This is an alternative parameter set. Do not use these parameters.
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||f1||11.255822MHz||f2||45.023289MHz||f3||39.395378MHz||
||Larm||3000.0m||Lmc||26.634m||||||
||Lprc||73.24838m||Lsrc||73.24838m||Las||3.3293m||
||Lp1||17.04838m||Lp2||14.1m||Lp3||17.1m||
||Lmi||25m||Lmx||26.66465m||Lmy||23.33535m||
||Ls1||17.04838m||Ls2||14.1m||Ls3||17.1m||		 ||f1 ||11.255822MHz ||f2 ||45.023289MHz ||f3 ||39.395378MHz ||
||Larm ||3000.0m ||Lmc ||26.634m ||||<style="text-align:center"> ||
||Lprc ||73.24838m ||Lsrc ||73.24838m ||Las ||3.3293m ||
||Lp1 ||16.9798m ||Lp2 ||14.2858m ||Lp3 ||16.9828m ||
||Lmi ||25m ||Lmx ||26.66465m ||Lmy ||23.33535m ||
||Ls1 ||16.9798m ||Ls2 ||14.2858m ||Ls3 ||16.9828m ||
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||ITM ||7246.3768m ||ETM ||7246.3768m ||||<style="text-align:center"> ||
||PRM ||361.552m ||PR2 ||-3.985m ||PR3 ||32.4m ||
||SRM ||361.552m ||SR2 ||-3.985m ||SR3 ||32.4m ||
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||PRM||344.518m||PR2||-3.919m||PR3||31.970m||
||SRM||344.518m||SR2||-3.919m||SR3||31.970m||
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||PRM||4.35mm||PR2||4.34mm||PR3||35.77mm||
||SRM||4.35mm||SR2||4.34mm||SR3||35.77mm||
  Lens effect (effective focal length)		 ||PRM ||4.355mm ||PR2 ||4.355mm ||PR3 ||35.77mm ||
||SRM ||4.355mm ||SR2 ||4.355mm ||SR3 ||35.77mm ||
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||ITM (Sapphire)||-9610m||
||PRM (Silica)||-765.6m||
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Lens effect (effective focal length seen from the AR side)
||ITM (Sapphire) ||-9610m ||
||PRM (Silica) ||-765.6m ||




----
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=== Test Masses ===
'''ITM'''
||HR Radius of Curvature ||1.68(+/-0.008)km ||0.5% error ||
||AR Radius of Curvature ||Flat (>100km) ||As flat as possible ||
||AR Wedge Angle ||0.2+/-0.002deg || ||
||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 ||0.2(+/-0.1) ||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'''
||HR Radius of Curvature ||1.87(+/-0.009)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 ||0.2(+/-0.01) ||Transmission of ETM must be smaller than ITM@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 ||

Actual Optical Parameters of the Main Interferometer

Contents

  1. Actual Optical Parameters of the Main Interferometer
    1. Optical Parameters
      1. Interferometer Diagram
      2. g1=-0.7857, g2=-0.6043, 16.875MHz, 45MHz
      3. g1=g2=0.586, 11.25MHz, 45MHz
    2. Mirror Specs
      1. Test Masses

Optical Parameters

Interferometer Diagram

MIF Diagram

g1=-0.7857, g2=-0.6043, 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

14.7606

Lp2

11.0669m

Lp3

15.7638m

Lmi

25m

Lmx

26.6649m

Lmy

23.3351m

Ls1

14.7606m

Ls2

11.0669m

Ls3

15.7638m

Folding angle

0.6860[deg]

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

1680.0m

ETM

1870.0m

PRM

303.96m

PR2

-2.7628m

PR3

24.574m

SRM

303.96m

SR2

-2.7764m

SR3

24.584m

Beam Spot Size (1/e^2 radius)

ITM

35.064mm

ETM

39.983mm

PRM

4.030mm

PR2

4.030mm

PR3

36.479mm

SRM

4.031mm

SR2

4.031mm

SR3

36.327mm

Lens effect (effective focal length seen from the AR side)

ITM (Sapphire)

>666km

PRM (Silica)

>10000km

g1=g2=0.586, 11.25MHz, 45MHz

This is an alternative parameter set. Do not use these parameters.

Lengths & Frequencies

f1

11.255822MHz

f2

45.023289MHz

f3

39.395378MHz

Larm

3000.0m

Lmc

26.634m

Lprc

73.24838m

Lsrc

73.24838m

Las

3.3293m

Lp1

16.9798m

Lp2

14.2858m

Lp3

16.9828m

Lmi

25m

Lmx

26.66465m

Lmy

23.33535m

Ls1

16.9798m

Ls2

14.2858m

Ls3

16.9828m

Radius of Curvatures (Positive for concave)

ITM

7246.3768m

ETM

7246.3768m

PRM

361.552m

PR2

-3.985m

PR3

32.4m

SRM

361.552m

SR2

-3.985m

SR3

32.4m

Beam Spot Size (1/e^2 radius)

PRM

4.355mm

PR2

4.355mm

PR3

35.77mm

SRM

4.355mm

SR2

4.355mm

SR3

35.77mm

Lens effect (effective focal length seen from the AR side)

ITM (Sapphire)

-9610m

PRM (Silica)

-765.6m

Mirror Specs

Test Masses

ITM

HR Radius of Curvature

1.68(+/-0.008)km

0.5% error

AR Radius of Curvature

Flat (>100km)

As flat as possible

AR Wedge Angle

0.2+/-0.002deg

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

0.2(+/-0.1)

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

HR Radius of Curvature

1.87(+/-0.009)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

0.2(+/-0.01)

Transmission of ETM must be smaller than ITM@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

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