Parameter

LCGT VRSE-D¹

LCGT VRSE-B

units

Laser source

Wave length

1064

nm

Initial Laser Power

150

W

Injecting Laser Power into IFO

78.48 (in total), 75 (carrier)

W

Modulation depth

0.3 for both

RF freq 1

11.25 (PM)

MHz

RF freq 2

45.00 (PM)

MHz

MC1 length

13.324109

m

MC2 length

13.324109

m

MC1 FSR

MHz

MC2 FSR

MHz

MC1 Finesse

MHz

MC2 Finesse

MHz

Cavity Length

Arm cavity length

3006.69

m

PR cavity length

73.2826

m

PRM-BS length

48.2826

m

BS-FM X length

26.665515

m

BS-FM Y length

23.334485

m

Asymmetry length

3.33103

m

SR cavity length

m

SRM-BS length

m

SRC detuning phase

0.05934 = 3.4 degree

0

rad

Mirror geometries or mechanical properties

EM mass

30

kg

FM mass

30

kg

PRM mass

Not defined

kg

SRM mass

Not defined

kg

BS mass

Not defined

kg

EM ROC

7113.900

m

FM ROC

7113.900

m

FM AR ROC

Not defined

m

PRM ROC

Not defined

m

SRM ROC

Not defined

m

BS ROC

Infinity

m

EM thickness

15

cm

FM thickness

15

cm

PRM thickness

Not defined

cm

SRM thickness

Not defined

cm

BS thickness

Not defined

cm

Mirror optical properties

EM Reflectivity

0.999945

FM Reflectivity

0.996

PRM Reflectivity

0.9

SRM Reflectivity

0.8464 = 0.92^2

BS Reflectivity

0.5

HR Coating Loss of EM, FM, PRM and SRM

45e-6

BS Loss

100e-6

Transmissivity

1 - R - Loss

AR Transmissivity

0.999

AR Coating Loss

1000e-6

Bulk loss (absorption) (large optics: ???FM, EM)

20

ppm/cm

Bulk loss (absorption) (small optics: ???)

2.5

ppm/cm

Arm cavity FSR

0.05

0.05

MHz

PRC cavity FSR

19.3166

6.7

MHz

Arm cavity Finesse

1250

1548

777

777

Arm power gain

796

987

Arm power(single)

0.398

0.3859

0.202

0.202

MW

PR gain

10

10.63

11

11

PRC power on BS

1000

797.14

825

825

W

SR gain

10

14.68

?

N/A

Arm cavity cut-off frequency

16.14

31.8

31.8

Hz

PR cavity cut-off frequency

1.209e6

Hz

PR-Arm cut-off frequency

1.189

2.3

2.3

Hz

Signal band

236.9

Hz

MICH contrast

0.995

0.995

Other losses in PRC

Not defined

1e-3

0.02/PRG

0.02/PRG

Other losses in SRC

Not defined

0.02/SRG

0.02/SRG

Output Mode Cleaner

OMC input/output mirror reflectivity

OMC end mirror reflectivity

OMC length

1.5

m

OMC MC FSR

???

MHz

OMC Finesse

2000

MHz

Control Bandwidth

Quantum efficiency

0.9

CARM control band width

30k

Hz

DARM control band width

200

Hz

PRC control band width

50

Hz

MICH control band width

50

Hz

SRC control band width

50

Hz

Feed-Forward gain

-0.97

1/(1-0.97) = 30