BK6 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.539980 n_e = 1.542136	V_d = 59.67 V_e = 59.40	n_F - n_C = 0.009048 n_F' - n_C' = 0.009125

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.53834 C3 = 0.016787 C4 = -0.00943611 C5 = -0.00117616 C6 = -0.000648128 C7 = 0.0000953372 C8 = 0.000458123 C9 = -0.00037408 C10 = -0.00010259 C11 = 0.000361166

Refraction index
n _2.3254	1.513998
n _1.9701	1.518833
n _1.5296	1.523962
n _1.06	1.529199
n _t	1.529804
n _s	1.532340
n _r	1.535655
n _C	1.537226
n _C'	1.537665
n _0.6328	1.538075
n _D	1.539900
n _d	1.539980
n _e	1.542136
n _F	1.546275
n _F'	1.546791
n _g	1.551202
n _h	1.555281
n _i	1.562259
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8202
P_C,A'	0.3485
P_d,C	0.3043
P_e,C	0.5426
P_g,d	1.2401
P_g,F	0.5444
P_h,g	0.4508
P_i,g	1.2220
P_C',t	0.8688
P_e,C'	0.4941
P_F',e	0.5144
P_i,F'	1.7094

Density: 2.86 g/cm³
Poisson coef.: 0.232
Rigidity: 284.4 Pa*10⁸
Young module: 700.7 Pa*10⁸
Optical stress coef.: 2.65 1/Pa*10¹²
Abrasion: 0.9

Climatic resistance: А
Resistance to acids: I

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	74
0 ~ 30	77
20 ~ 120	82
20 ~ 300	89

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	0.2
-60 ~ 20	e	-0.04
-60 ~ 20	D	-0.16
-60 ~ 20	C	-0.3
20 ~ 120	F	1.4
20 ~ 120	e	1.1
20 ~ 120	D	1
20 ~ 120	C	0.8