STK20 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.764828 n_e = 1.768458	V_d = 50.19 V_e = 49.96	n_F - n_C = 0.015237 n_F' - n_C' = 0.015379

Type: Resnik
Spectral range: 0.40466 - 2.5 mkm.
C1 = 0.028 C2 = 1.75682 C3 = 0.022531 C4 = -0.0134304 C5 = -0.0011808 C6 = -0.000211493 C7 = 0.000265206 C8 = 0.0000839004 C9 = -0.0000843641 C10 = -0.000647514 C11 = 0

Refraction index
n _2.3254	1.722972
n _1.9701	1.730482
n _1.5296	1.738512
n _1.06	1.747014
n _t	1.747998
n _s	1.752137
n _r	1.757600
n _C	1.760215
n _C'	1.760947
n _0.6328	1.761633
n _D	1.764692
n _d	1.764828
n _e	1.768458
n _F	1.775452
n _F'	1.776327
n _g	1.783831
n _h	-----
n _i	-----
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8016
P_C,A'	0.3433
P_d,C	0.3027
P_e,C	0.5409
P_g,d	1.2470
P_g,F	0.5498
P_h,g	-----
P_i,g	-----
P_C',t	0.8497
P_e,C'	0.4928
P_F',e	0.5164
P_i,F'	-----

Density: 4.36 g/cm³
Optical stress coef.: 1.45 1/Pa*10¹²
Abrasion: 1.32

Climatic resistance: с
Resistance to acids: IV

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	58
0 ~ 30	59
20 ~ 120	62
20 ~ 300	66