Thermal noise limit

Parameters needed for thermal noise calculation

Literature:

[1] J. Opt. Soc. Am. B pp 914, Vol. 27, No. 5/May 2010

[2] NATURE PHOTONICS Vol.7, 644 (2013)

[3] Optics Letters, Vol. 40, Iss. 9, p. 2112 (2015).

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/e2 mode radius on the mirror	w	0.000488 m for Mirror 1 0.000677 m for Mirror 2	Mode calculations
Effective coefficient of thermal expansion for substrate	αsb	1.2* 10-6 K-1	Fused Silica substrtae [2]
Effective coefficient of thermal expansion for coating	αc	1.68* 10-5 K-1	AlGaAs coating [2]
Effective thermorefractive coefficient for coating	βc	5*10-5	AlGaAs coating [2]
Thermal conductivity for substrate	κsb	1.38 W/Km	Fused Silica substrate [2]
Thermal conductivity for coating	κc	62.9 W/Km	AlGaAs coating [2]
Heat capacity per unit volume for substrate	Csb	1.71*106 J/Km3	Fused Silica substrate [2]
Heat capacity per unit volume for coating	Cc	1.64*106 J/Km3	AlGaAs coating [2]