BF8 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.582714 n_e = 1.585693	V_d = 46.47 V_e = 46.17	n_F - n_C = 0.012538 n_F' - n_C' = 0.012682

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.58425 C3 = 0.0241317 C4 = -0.00873001 C5 = -0.00073549 C6 = -0.000104723 C7 = 0.000519845 C8 = 0.000566605 C9 = -0.000353727 C10 = -0.000512527 C11 = 0

Refraction index
n _2.3254	1.553588
n _1.9701	1.558038
n _1.5296	1.563106
n _1.06	1.568818
n _t	1.569526
n _s	1.572609
n _r	1.576880
n _C	1.578972
n _C'	1.579563
n _0.6328	1.580116
n _D	1.582603
n _d	1.582714
n _e	1.585693
n _F	1.591511
n _F'	1.592246
n _g	1.598622
n _h	1.604697
n _i	1.615356
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7533
P_C,A'	0.3317
P_d,C	0.2983
P_e,C	0.5359
P_g,d	1.2687
P_g,F	0.5670
P_h,g	0.4845
P_i,g	1.3346
P_C',t	0.8004
P_e,C'	0.4888
P_F',e	0.5226
P_i,F'	1.8431

Density: 3.28 g/cm³
Poisson coef.: 0.239
Rigidity: 259 Pa*10⁸
Young module: 641.9 Pa*10⁸
Optical stress coef.: 2.91 1/Pa*10¹²
Abrasion: 0.5

Climatic resistance: А
Resistance to acids: I

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	77
0 ~ 30	79
20 ~ 120	82
20 ~ 300	87

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	1.5
-60 ~ 20	e	1
-60 ~ 20	D	0.8
-60 ~ 20	C	0.6
20 ~ 120	F	3.4
20 ~ 120	e	2.9
20 ~ 120	D	2.7
20 ~ 120	C	2.4