TBF4 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.778772 n_e = 1.783620	V_d = 38.08 V_e = 37.82	n_F - n_C = 0.020446 n_F' - n_C' = 0.020719

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.7828 C3 = 0.0398592 C4 = -0.0114818 C5 = -0.000191051 C6 = -0.000542775 C7 = 0.000312457 C8 = 0 C9 = 0 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.735780
n _1.9701	1.741898
n _1.5296	1.748709
n _1.06	1.756919
n _t	1.757988
n _s	1.762724
n _r	1.769422
n _C	1.772751
n _C'	1.773696
n _0.6328	1.774584
n _D	1.778593
n _d	1.778772
n _e	1.783620
n _F	1.793197
n _F'	1.794415
n _g	1.805049
n _h	1.815291
n _i	1.833717
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7220
P_C,A'	0.3222
P_d,C	0.2944
P_e,C	0.5315
P_g,d	1.2851
P_g,F	0.5796
P_h,g	0.5009
P_i,g	1.4021
P_C',t	0.7682
P_e,C'	0.4853
P_F',e	0.5280
P_i,F'	1.9221

Density: 4.46 g/cm³
Poisson coef.: 0.308
Young module: 967 Pa*10⁸
Optical stress coef.: 2.3 1/Pa*10¹²
Abrasion: 1.7

Climatic resistance: а
Resistance to acids: IV

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	65
0 ~ 30	69
20 ~ 120	75
20 ~ 300	84

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	5.9
-60 ~ 20	e	5
-60 ~ 20	D	4.6
-60 ~ 20	C	4.2
20 ~ 120	F	8.1
20 ~ 120	e	7.1
20 ~ 120	D	6.6
20 ~ 120	C	6.1