Parameters
Beam radius 3.5 cm Suspension length 40 cm Diameter of suspension fiber (silica) -- Number of suspension fiber 4 Mechanical loss of fiber -- Mechanical loss of a mirror 1e-8 Number of coating layers (ITM) 9 Number of coating layers (ETM) 18 Mechanical loss of Silica coatings 5e-5? Mechanical loss of Tantala coatings 2e-4? Optical loss of each arm 100 ppm/roundtrip Optical loss in the SRC 2% Optical loss at the PD 10%
Material properties
Density of Silica 2200 kg/m^3 Young's modulus of Silica 7.2e10 Pa Poisson ratio of Silica 0.17 Refraction index of Silica 1.45 Thermal expansion of Silica 5.1e-7 1/K Specific heat per volume of Silica 1.64e6 J/K/m^3 Thermal conductivity of Silica 1.38 W/m/K dn/dT of Silica 8e-6 1/K Young's modulus of Tantala 1.4e11 Pa Poisson ratio of Tantala 0.23 Refraction index of Tantala 2.06 Thermal expansion of Tantala 3.6e-7 1/K Specific heat per volume of Tantala 2.1e6 J/K/m^3 Thermal conductivity of Tantala 33 W/m/K dn/dT of Tantala 14e-6 1/K