K18 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.519174 n_e = 1.521224	V_d = 60.37 V_e = 60.13	n_F - n_C = 0.008599 n_F' - n_C' = 0.008667

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.51493 C3 = 0.0156279 C4 = -0.011073 C5 = -0.000970102 C6 = -0.000455731 C7 = 0.000118043 C8 = 0 C9 = 0 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.491644
n _1.9701	1.497177
n _1.5296	1.502945
n _1.06	1.508646
n _t	1.509272
n _s	1.511820
n _r	1.515039
n _C	1.516546
n _C'	1.516966
n _0.6328	1.517357
n _D	1.519097
n _d	1.519174
n _e	1.521224
n _F	1.525145
n _F'	1.525633
n _g	1.529802
n _h	1.533676
n _i	1.540322
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8459
P_C,A'	0.3527
P_d,C	0.3056
P_e,C	0.5440
P_g,d	1.2360
P_g,F	0.5416
P_h,g	0.4504
P_i,g	1.2233
P_C',t	0.8947
P_e,C'	0.4952
P_F',e	0.5127
P_i,F'	1.7081

Density: 2.58 g/cm³
Poisson coef.: 0.202
Young module: 774 Pa*10⁸
Optical stress coef.: 2.9 1/Pa*10¹²
Abrasion: 1

Climatic resistance: А
Resistance to acids: I

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	64
0 ~ 30	66
20 ~ 120	70
20 ~ 300	77