C - Diamond

Optical properties

Index of refraction 2.4
Radiative recombination coefficient 9·105cm3/s

Infrared refractive index n=2.375.

At 300 K:

dn/dT=4.04·10-6·n K-1
Type IIa diamond refractive index versus wavelength.
Experimental points: data from four references
(Edwards and Ochoa [1981]).
Type IIa diamond refractive index versus photon energy at 300 K.
(Walker and Osantowski [1964]).
Reflectance versus photon energy, 300 K.
(Walker and Osantowski [1964]).
Absorption edge spectrum of diamond at various temperatures.
(Clark et al. [1964]).
Visible and ultraviolet absorption spectra of a diamond with different types of impurities.
Predominant type of impurity is: 1. boron atoms; 2. N3 centers; 3. single nitrogen atoms; 4. absorption spectra of a brown diamond.
(Wilks and Wilks [1991]).
Infrared absorption spectra of a diamond
in which 1. boron atoms are predominant impurities; 2. single nitrogen atoms are predominant impurities
(Wilks and Wilks [1991]).

Two-photon absorption coefficient β for IIa diamond (ρ=1014-1016 Ω cm))

λ τp, ns β×1011, m W-1
0.248 0.0005 1.6±0.3
0.31 0.000135 0.75±0.15
0.3547 0.015 0.3
0.5321 0.03 <0.26
(Nikogosyan [1998]).