BK13 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.559485 n_e = 1.561668	V_d = 61.14 V_e = 60.89	n_F - n_C = 0.009150 n_F' - n_C' = 0.009223

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.55622 C3 = 0.0167225 C4 = -0.0106916 C5 = -0.00117473 C6 = -0.000536132 C7 = 0.000185915 C8 = 0.00015761 C9 = -0.0000810087 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.531732
n _1.9701	1.537116
n _1.5296	1.542765
n _1.06	1.548437
n _t	1.549074
n _s	1.551706
n _r	1.555092
n _C	1.556690
n _C'	1.557136
n _0.6328	1.557552
n _D	1.559403
n _d	1.559485
n _e	1.561668
n _F	1.565841
n _F'	1.566360
n _g	1.570790
n _h	1.574894
n _i	1.581869
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8323
P_C,A'	0.3508
P_d,C	0.3054
P_e,C	0.5439
P_g,d	1.2354
P_g,F	0.5408
P_h,g	0.4485
P_i,g	1.2107
P_C',t	0.8810
P_e,C'	0.4952
P_F',e	0.5127
P_i,F'	1.6949

Density: 3.04 g/cm³
Poisson coef.: 0.237
Rigidity: 313.3 Pa*10⁸
Young module: 775.2 Pa*10⁸
Optical stress coef.: 2.5 1/Pa*10¹²
Abrasion: 0.9

Climatic resistance: А
Resistance to acids: III

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	62
0 ~ 30	64
20 ~ 120	69
20 ~ 300	75

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	1
-60 ~ 20	e	0.7
-60 ~ 20	D	0.6
-60 ~ 20	C	0.5
20 ~ 120	F	2.5
20 ~ 120	e	2.2
20 ~ 120	D	2.1
20 ~ 120	C	2