BF12 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.626040 n_e = 1.629835	V_d = 39.10 V_e = 38.82	n_F - n_C = 0.016008 n_F' - n_C' = 0.016220

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.62979 C3 = 0.0312423 C4 = -0.00879887 C5 = -0.000276494 C6 = -0.000793529 C7 = 0.000127243 C8 = 0.000309812 C9 = -0.000134239 C10 = 0.00024301 C11 = 0.000318361

Refraction index
n _2.3254	1.592573
n _1.9701	1.597335
n _1.5296	1.602600
n _1.06	1.608918
n _t	1.609750
n _s	1.613457
n _r	1.618713
n _C	1.621324
n _C'	1.622064
n _0.6328	1.622759
n _D	1.625899
n _d	1.626040
n _e	1.629835
n _F	1.637332
n _F'	1.638285
n _g	1.646595
n _h	1.654577
n _i	1.669003
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7229
P_C,A'	0.3228
P_d,C	0.2945
P_e,C	0.5316
P_g,d	1.2840
P_g,F	0.5786
P_h,g	0.4986
P_i,g	1.3998
P_C',t	0.7692
P_e,C'	0.4854
P_F',e	0.5278
P_i,F'	1.9189

Density: 3.67 g/cm³
Poisson coef.: 0.243
Rigidity: 245.6 Pa*10⁸
Young module: 610.5 Pa*10⁸
Optical stress coef.: 2.55 1/Pa*10¹²
Abrasion: 0.6

Climatic resistance: А
Resistance to acids: III

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	82
0 ~ 30	85
20 ~ 120	89
20 ~ 300	94

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	2
-60 ~ 20	e	1.3
-60 ~ 20	D	0.9
-60 ~ 20	C	0.6
20 ~ 120	F	3.9
20 ~ 120	e	3
20 ~ 120	D	2.7
20 ~ 120	C	2.3