Optical constants of OHARA - FTM
FTM8
Wavelength:
µm
(0.3 – 2.4)
Derived optical constants
n
k
logX
logY
eV
Dispersion formula
$$n^2=2.3063389-0.009299434λ^{2}+0.014148541λ^{-2}+0.00061944948λ^{-4}-3.542134\text{×}10^{-05}λ^{-6}+4.3560988\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_absolute: false
λ_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -2.683e-06 0.0 0.0 0.0 0.0 0.0
n_d: 1.532565
V_d: 45.914102
glass_code: 533459
glass_status: preferred
density: 2.53 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 8.5e-06 K-1
- temperature_range: 20 300 °C
coefficient: 9.7e-06 K-1
ΔP_gF: 0.0077
acid_resistance: 1.0
phosphate_resistance: 1.0
References
OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)
See also OHARA glass data sheets