BF7 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.579593 n_e = 1.582154	V_d = 53.86 V_e = 53.56	n_F - n_C = 0.010760 n_F' - n_C' = 0.010868

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.57825 C3 = 0.0200886 C4 = -0.0094693 C5 = -0.00103066 C6 = -0.000682687 C7 = -0.000260141 C8 = -0.0000965995 C9 = 0.00000475981 C10 = 0.000401188 C11 = 0.000310984

Refraction index
n _2.3254	1.551453
n _1.9701	1.556372
n _1.5296	1.561559
n _1.06	1.567183
n _t	1.567858
n _s	1.570722
n _r	1.574528
n _C	1.576355
n _C'	1.576868
n _0.6328	1.577349
n _D	1.579498
n _d	1.579593
n _e	1.582154
n _F	1.587115
n _F'	1.587737
n _g	1.593066
n _h	1.598025
n _i	1.606646
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7897
P_C,A'	0.3394
P_d,C	0.3009
P_e,C	0.5389
P_g,d	1.2521
P_g,F	0.5530
P_h,g	0.4608
P_i,g	1.2620
P_C',t	0.8374
P_e,C'	0.4912
P_F',e	0.5188
P_i,F'	1.7573

Density: 3.23 g/cm³
Poisson coef.: 0.248
Rigidity: 292.5 Pa*10⁸
Young module: 730.1 Pa*10⁸
Optical stress coef.: 2.96 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	68
0 ~ 30	70
20 ~ 120	74
20 ~ 300	81

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	2.6
-60 ~ 20	e	2.2
-60 ~ 20	D	2.1
-60 ~ 20	C	1.9
20 ~ 120	F	4.3
20 ~ 120	e	4
20 ~ 120	D	3.8
20 ~ 120	C	3.7