BF11 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.622302 n_e = 1.625090	V_d = 53.14 V_e = 52.84	n_F - n_C = 0.011709 n_F' - n_C' = 0.011828

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.6217 C3 = 0.0219667 C4 = -0.00936412 C5 = -0.00113839 C6 = -0.000174689 C7 = 0.000100562 C8 = 0 C9 = 0 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.593087
n _1.9701	1.597844
n _1.5296	1.603088
n _1.06	1.608946
n _t	1.609656
n _s	1.612696
n _r	1.616795
n _C	1.618779
n _C'	1.619337
n _0.6328	1.619859
n _D	1.622198
n _d	1.622302
n _e	1.625090
n _F	1.630489
n _F'	1.631165
n _g	1.636978
n _h	1.642420
n _i	1.651816
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7790
P_C,A'	0.3378
P_d,C	0.3008
P_e,C	0.5389
P_g,d	1.2533
P_g,F	0.5541
P_h,g	0.4647
P_i,g	1.2671
P_C',t	0.8266
P_e,C'	0.4913
P_F',e	0.5187
P_i,F'	1.7635

Density: 3.66 g/cm³
Poisson coef.: 0.271
Rigidity: 303.4 Pa*10⁸
Young module: 771.3 Pa*10⁸
Optical stress coef.: 2.35 1/Pa*10¹²
Abrasion: 0.5

Climatic resistance: А
Resistance to acids: III

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	63
0 ~ 30	66
20 ~ 120	70
20 ~ 300	77

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	2.8
-60 ~ 20	e	2.4
-60 ~ 20	D	2.2
-60 ~ 20	C	2
20 ~ 120	F	4.7
20 ~ 120	e	4.3
20 ~ 120	D	4.1
20 ~ 120	C	4