TK20 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.622096 n_e = 1.624710	V_d = 56.72 V_e = 56.44	n_F - n_C = 0.010967 n_F' - n_C' = 0.011067

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.62069 C3 = 0.0203823 C4 = -0.00994981 C5 = -0.00127669 C6 = -0.000262678 C7 = 0.000212692 C8 = 0.000254975 C9 = -0.000131053 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.592952
n _1.9701	1.597948
n _1.5296	1.603426
n _1.06	1.609314
n _t	1.610011
n _s	1.612964
n _r	1.616890
n _C	1.618773
n _C'	1.619301
n _0.6328	1.619795
n _D	1.621998
n _d	1.622096
n _e	1.624710
n _F	1.629740
n _F'	1.630368
n _g	1.635750
n _h	1.640761
n _i	1.649308
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7989
P_C,A'	0.3433
P_d,C	0.3029
P_e,C	0.5413
P_g,d	1.2450
P_g,F	0.5479
P_h,g	0.4569
P_i,g	1.2362
P_C',t	0.8470
P_e,C'	0.4931
P_F',e	0.5159
P_i,F'	1.7269

Density: 3.58 g/cm³
Poisson coef.: 0.272
Rigidity: 318.2 Pa*10⁸
Young module: 809.5 Pa*10⁸
Optical stress coef.: 1.89 1/Pa*10¹²
Abrasion: 0.8

Climatic resistance: А
Resistance to acids: III

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	67
0 ~ 30	69
20 ~ 120	73
20 ~ 300	78

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	0.4
-60 ~ 20	e	0.2
-60 ~ 20	D	0.06
20 ~ 120	F	1.8
20 ~ 120	e	1.5
20 ~ 120	D	1.4
20 ~ 120	C	1.2