BF13 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.639614 n_e = 1.642764	V_d = 48.27 V_e = 47.98	n_F - n_C = 0.013248 n_F' - n_C' = 0.013395

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.64087 C3 = 0.0253344 C4 = -0.00960322 C5 = -0.00105533 C6 = -0.000547332 C7 = 0.000135859 C8 = 0.000431258 C9 = -0.000275225 C10 = -0.000258452 C11 = 0.000446753

Refraction index
n _2.3254	1.608053
n _1.9701	1.613089
n _1.5296	1.618617
n _1.06	1.624791
n _t	1.625556
n _s	1.628876
n _r	1.633433
n _C	1.635653
n _C'	1.636279
n _0.6328	1.636866
n _D	1.639497
n _d	1.639614
n _e	1.642764
n _F	1.648902
n _F'	1.649675
n _g	1.656351
n _h	1.662650
n _i	1.673821
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7621
P_C,A'	0.3336
P_d,C	0.2989
P_e,C	0.5366
P_g,d	1.2632
P_g,F	0.5621
P_h,g	0.4754
P_i,g	1.3186
P_C',t	0.8093
P_e,C'	0.4894
P_F',e	0.5216
P_i,F'	1.8224

Density: 3.82 g/cm³
Poisson coef.: 0.27
Rigidity: 300.2 Pa*10⁸
Young module: 762.4 Pa*10⁸
Optical stress coef.: 2.14 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	61
0 ~ 30	64
20 ~ 120	70
20 ~ 300	79

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	3.1
-60 ~ 20	e	2.6
-60 ~ 20	D	2.4
-60 ~ 20	C	2.2
20 ~ 120	F	4.7
20 ~ 120	e	4.2
20 ~ 120	D	4
20 ~ 120	C	3.8