TF8 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.689488 n_e = 1.694726	V_d = 31.12 V_e = 30.89	n_F - n_C = 0.022149 n_F' - n_C' = 0.022484

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.69642 C3 = 0.0440136 C4 = -0.00925351 C5 = 0.000998481 C6 = -0.000107321 C7 = 0.000359244 C8 = -0.00016495 C9 = 0.0000847817 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.647923
n _1.9701	1.652928
n _1.5296	1.658814
n _1.06	1.666619
n _t	1.667688
n _s	1.672517
n _r	1.679517
n _C	1.683046
n _C'	1.684052
n _0.6328	1.684998
n _D	1.689295
n _d	1.689488
n _e	1.694726
n _F	1.705195
n _F'	1.706537
n _g	1.718355
n _h	1.729914
n _i	1.751184
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.6933
P_C,A'	0.3139
P_d,C	0.2908
P_e,C	0.5273
P_g,d	1.3032
P_g,F	0.5941
P_h,g	0.5219
P_i,g	1.4821
P_C',t	0.7388
P_e,C'	0.4819
P_F',e	0.5332
P_i,F'	2.0157

Density: 4.23 g/cm³
Poisson coef.: 0.229
Rigidity: 228.4 Pa*10⁸
Young module: 561.5 Pa*10⁸
Optical stress coef.: 2.09 1/Pa*10¹²
Abrasion: 0.6

Climatic resistance: А
Resistance to acids: II

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	76
0 ~ 30	78
20 ~ 120	82
20 ~ 300	87

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	5.8
-60 ~ 20	e	4.5
-60 ~ 20	D	3.9
-60 ~ 20	C	3.3
20 ~ 120	F	7.9
20 ~ 120	e	6.5
20 ~ 120	D	5.9
20 ~ 120	C	5.2