STF2 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.944499 n_e = 1.955365	V_d = 20.41 V_e = 20.25	n_F - n_C = 0.046262 n_F' - n_C' = 0.047163

Type: Resnik
Spectral range: 0.43583 - 2.6 mkm.
C1 = 0.028 C2 = 1.93729 C3 = 0.0586239 C4 = -0.00836607 C5 = 0.00264248 C6 = -0.000637803 C7 = 0.000665048 C8 = 0 C9 = 0 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.876187
n _1.9701	1.881637
n _1.5296	1.888681
n _1.06	1.900391
n _t	1.902221
n _s	1.910945
n _r	1.924411
n _C	1.931422
n _C'	1.933442
n _0.6328	1.935350
n _D	1.944103
n _d	1.944499
n _e	1.955365
n _F	1.977685
n _F'	1.980605
n _g	2.006946
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	0.6312
P_C,A'	0.2958
P_d,C	0.2826
P_e,C	0.5175
P_g,d	1.3498
P_g,F	0.6325
P_h,g	-----
P_i,g	-----
P_C',t	0.6748
P_e,C'	0.4738
P_F',e	0.5455
P_i,F'	-----

Density: 6.15 g/cm³
Optical stress coef.: -1.3 1/Pa*10¹²
Abrasion: 0.31

Climatic resistance: Б
Resistance to acids: V

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	81
0 ~ 30	84
20 ~ 120	89
20 ~ 300	95