BK11 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.552482 n_e = 1.554563	V_d = 63.35 V_e = 63.13	n_F - n_C = 0.008719 n_F' - n_C' = 0.008784

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.54785 C3 = 0.0157358 C4 = -0.0115893 C5 = -0.00114279 C6 = -0.000495906 C7 = 0.000104265 C8 = 0 C9 = 0 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.523981
n _1.9701	1.529772
n _1.5296	1.535791
n _1.06	1.541705
n _t	1.542351
n _s	1.544973
n _r	1.548270
n _C	1.549807
n _C'	1.550235
n _0.6328	1.550634
n _D	1.552404
n _d	1.552482
n _e	1.554563
n _F	1.558527
n _F'	1.559019
n _g	1.563207
n _h	1.567074
n _i	1.573639
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8550
P_C,A'	0.3553
P_d,C	0.3067
P_e,C	0.5453
P_g,d	1.2300
P_g,F	0.5367
P_h,g	0.4433
P_i,g	1.1963
P_C',t	0.9041
P_e,C'	0.4963
P_F',e	0.5110
P_i,F'	1.6766

Density: 2.91 g/cm³
Poisson coef.: 0.222
Young module: 841 Pa*10⁸
Optical stress coef.: 2.4 1/Pa*10¹²
Abrasion: 0.9

Climatic resistance: А
Resistance to acids: III

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	60
0 ~ 30	62
20 ~ 120	66
20 ~ 300	72