STK19 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.744135 n_e = 1.747650	V_d = 50.43 V_e = 50.20	n_F - n_C = 0.014755 n_F' - n_C' = 0.014893

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.74196 C3 = 0.0275919 C4 = -0.01443 C5 = -0.0017315 C6 = -0.000420426 C7 = 0.000186048 C8 = 0.0004038 C9 = -0.000187905 C10 = -0.00068286 C11 = 0.000411958

Refraction index
n _2.3254	1.703438
n _1.9701	1.710763
n _1.5296	1.718664
n _1.06	1.726900
n _t	1.727852
n _s	1.731855
n _r	1.737142
n _C	1.739671
n _C'	1.740380
n _0.6328	1.741043
n _D	1.744004
n _d	1.744135
n _e	1.747650
n _F	1.754427
n _F'	1.755274
n _g	1.762534
n _h	1.769305
n _i	1.781151
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8010
P_C,A'	0.3430
P_d,C	0.3025
P_e,C	0.5407
P_g,d	1.2469
P_g,F	0.5494
P_h,g	0.4589
P_i,g	1.2617
P_C',t	0.8490
P_e,C'	0.4926
P_F',e	0.5166
P_i,F'	1.7538

Density: 4.09 g/cm³
Optical stress coef.: 1.95 1/Pa*10¹²
Abrasion: 1.13

Climatic resistance: c
Resistance to acids: IV

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	51
0 ~ 30	54
20 ~ 120	59
20 ~ 300	67

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-60 ~ 20	F	4.7
-60 ~ 20	e	4.1
-60 ~ 20	D	3.9
-60 ~ 20	C	3.7
20 ~ 120	F	6.4
20 ~ 120	e	5.8
20 ~ 120	D	5.6
20 ~ 120	C	5.4