T = 300 K. N d - N a = 3 x 10 17 cm-3 Radovanova: 6H-SiC. Optical absorption coeﬃcient of amorphous and microcrys-talline silicon samples at the temperatures 250, 300 and 350 K calcu-lated from transmission spectra (symbols). The infrared absorption coefficient vs. wavelength. If λ is in nm, multiply by 10 7 to get the absorption coefficient in the units of cm-1. Silicon is widely used as an optical material in macroscopic and microscopic opto-mechanical applications. optical absorption coefficient 250 K α (cm-1) photon energy (eV) amorphous silicon: 350 K 300 K 250 K c-Si (300 K) Fig. Rev. N d - N a = 10 17 cm-3 Dubrovskii & Radovanova: 4H-SiC. B Optical Properties This table outlines some basic optical properties of silicon. Wavelength: µm Thickness: Calculation method: Transmittance. Additional optical properties of silicon are given in the page Optical Properties of Silicon. A theoretical model with explicit formulas for calculating the optical absorption and gain coefficients of silicon is presented. 2. It incorporates direct and indirect interband transitions and considers the effects of occupied/unoccupied carrier states. Free carrier absorption coefficient vs. wavelength c axis and || c axis. Optical properties, refractive index and absorption coefficient, of silicon, sapphire, silica and pyrex glass near 1 THz frequency were determined by simple transmission measurements of THz pulses. T = LogX LogY eV Reflection calculator. For transmissive optics its indirect band gap of around 1.12 eV prevents a use in the visible spectrum due to the high absorption with respect to interband transitions. B 27, 985-1009 (1983) Data [CSV - comma separated] [TXT - tab separated] [Full database record] Optical transmission calculator. The absorption coefficient vs. temperature at different wavelength λ. 1 - T = 80 K; 2 - T = 300 K. E c axis. However, operation in the near infrared band beyond about 1200 nm provides a sufficiently low optical absorption … Dielectric functions and optical parameters of Si, Ge, GaP, GaAs, GaSb, InP, InAs, and InSb from 1.5 to 6.0 eV, Phys. The graphs relate wavelength to the absorption coefficient and to the percentages of reflection, transmission, and absorption. The absorption coefficient, α, is related to the extinction coefficient, k, by the following formula: $$\alpha=\frac{4 \pi k}{\lambda}$$ where λ is the wavelength.