Optical constants of OHARA - BPM (Borophosphate, medium-index)
BPM4
Wavelength:
µm
(0.3–2.4)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.5489492-0.012922911λ^{2}+0.018433588λ^{-2}+0.00067483064λ^{-4}-2.8837579\text{×}10^{-05}λ^{-6}+3.057603\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 7.898e-06 0.0 0.0 0.0 0.0 0.0
nd: 1.613400
Vd: 43.841533
glass_code: 613438
glass_status: preferred
density: 3.22 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 5.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 6.4e-06 K-1
dPgF: -0.008
acid_resistance: 53.2
phosphate_resistance: 4.2
References
OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)
See also OHARA glass data sheets