BK10 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.568885 n_e = 1.571305	V_d = 56.01 V_e = 55.74	n_F - n_C = 0.010155 n_F' - n_C' = 0.010248

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.56757 C3 = 0.0189026 C4 = -0.00954096 C5 = -0.00117226 C6 = -0.000562466 C7 = 0.000239337 C8 = 0.000239771 C9 = -0.000114115 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.541526
n _1.9701	1.546411
n _1.5296	1.551609
n _1.06	1.557069
n _t	1.557712
n _s	1.560438
n _r	1.564067
n _C	1.565809
n _C'	1.566298
n _0.6328	1.566754
n _D	1.568794
n _d	1.568885
n _e	1.571305
n _F	1.575965
n _F'	1.576547
n _g	1.581536
n _h	1.586189
n _i	1.594163
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7972
P_C,A'	0.3429
P_d,C	0.3028
P_e,C	0.5411
P_g,d	1.2457
P_g,F	0.5485
P_h,g	0.4582
P_i,g	1.2433
P_C',t	0.8454
P_e,C'	0.4930
P_F',e	0.5161
P_i,F'	1.7346

Density: 3.12 g/cm³
Poisson coef.: 0.244
Rigidity: 295 Pa*10⁸
Young module: 734 Pa*10⁸
Optical stress coef.: 2.96 1/Pa*10¹²
Abrasion: 0.7

Climatic resistance: А
Resistance to acids: III

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	66
0 ~ 30	67
20 ~ 120	71
20 ~ 300	76

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	2.3
-60 ~ 20	e	1.9
-60 ~ 20	D	1.8
-60 ~ 20	C	1.6
20 ~ 120	F	3.8
20 ~ 120	e	3.5
20 ~ 120	D	3.3
20 ~ 120	C	3.1