FK13 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.546872 n_e = 1.548804	V_d = 67.59 V_e = 67.39	n_F - n_C = 0.008090 n_F' - n_C' = 0.008143

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.54237 C3 = 0.014597 C4 = -0.0114292 C5 = -0.00122845 C6 = -0.000240559 C7 = 0.000301204 C8 = 0.000118019 C9 = -0.000192451 C10 = -0.00063935 C11 = 0

Refraction index
n _2.3254	1.519298
n _1.9701	1.524989
n _1.5296	1.530955
n _1.06	1.536727
n _t	1.537343
n _s	1.539831
n _r	1.542936
n _C	1.544377
n _C'	1.544777
n _0.6328	1.545150
n _D	1.546800
n _d	1.546872
n _e	1.548804
n _F	1.552467
n _F'	1.552920
n _g	1.556776
n _h	1.560326
n _i	1.566277
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8694
P_C,A'	0.3596
P_d,C	0.3084
P_e,C	0.5472
P_g,d	1.2241
P_g,F	0.5326
P_h,g	0.4387
P_i,g	1.1744
P_C',t	0.9189
P_e,C'	0.4977
P_F',e	0.5087
P_i,F'	1.6510

Density: 2.93 g/cm³
Poisson coef.: 0.23
Young module: 680 Pa*10⁸
Optical stress coef.: 2.15 1/Pa*10¹²
Abrasion: 0.53

Climatic resistance: д
Resistance to acids: I

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	62
0 ~ 30	66
20 ~ 120	73
20 ~ 300	85