Thermal noise limit

Parameters needed for thermal noise calculation

Description	Material	Parameter name	Value	Comment
Boltzmann constant	kb	1.38064852 × 10-23 m2 kg s-2 K-1
Temperature (K)	T	300
Poisson Ratio of substrate	Fused Silica	σsb	0.16	Fused Silica substrtae [1]
Poisson Ratio of coating	AlGaAs	σc	0.32	AlGaAs coating [2]
Young's modulus of substrate	Fused Silica	Esb	72.7 Gpa	Fused Silica substrtae [1]
Young's modulus of spacer	ULE	Esp	67.6 Gpa	ULE Spacer [1]
Young's modulus of coating	AlGaAs	Ec	100 Gpa	AlGaAs coating [2]
Length of cavity	L	0.48 m	Sr Beast [3]
Spacer radius	Rsp	0.045 m	Sr Beast [3]
Central bore radius of spacer	rsp	0.0065 m	Sebastian Häfner Thesis page 83
Thickness of coating	AlGaAs	D	6.83*10	-6 m	AlGaAs coating [2]
1/e	2 mode radius on the mirror	0.000488 m for Mirror 1 0.000677 m for Mirror 2