SF56A - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.784701 n_e = 1.791798	V_d = 26.07 V_e = 25.87	n_F - n_C = 0.030091 n_F' - n_C' = 0.030602	Coloring: 0.42 - 0.37 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.70579259 C2 = 0.344223052 C3 = 1.09601828 C4 = 0.0133874699 C5 = 0.0579561608 C6 = 121.616024

Refraction index
n _2.3254	1.734063
n _1.9701	1.739254
n _1.5296	1.745587
n _1.06	1.754732
n _t	1.756057
n _s	1.762195
n _r	1.771362
n _C	1.776053
n _C'	1.777397
n _0.6328	1.778664
n _D	1.784441
n _d	1.784701
n _e	1.791798
n _F	1.806145
n _F'	1.807999
n _g	1.824494
n _h	1.840922
n _i	1.871995
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.6645
P_C,A'	0.3058
P_d,C	0.2873
P_e,C	0.5232
P_g,d	1.3223
P_g,F	0.6097
P_h,g	0.5459
P_i,g	1.5785
P_C',t	0.7091
P_e,C'	0.4785
P_F',e	0.5383
P_i,F'	2.1266

transmittance: 10 mm
τ_2.3254	0.91
τ_1.9701	0.967
τ_1.5296	0.994
τ_1.06	0.997
τ_0.7	0.999
τ_0.66	0.999
τ_0.62	0.999
τ_0.58	0.998
τ_0.54607	0.998
τ_0.5	0.996
τ_0.46	0.99
τ_0.4358	0.98
τ_0.42	0.959
τ_0.4047	0.9
τ_0.4	0.87
τ_0.39	0.73
τ_0.38	0.41

transmittance: 25 mm
τ_2.3254	0.78
τ_1.9701	0.92
τ_1.5296	0.985
τ_1.06	0.992
τ_0.7	0.997
τ_0.66	0.997
τ_0.62	0.997
τ_0.58	0.996
τ_0.54607	0.995
τ_0.5	0.99
τ_0.46	0.974
τ_0.4358	0.95
τ_0.42	0.9
τ_0.4047	0.77
τ_0.4	0.7
τ_0.39	0.45
τ_0.38	0.11

Density: 4.92 g/cm³
Poisson coef.: 0.239
Young module: 570 Pa*10⁸
Knoop hardness: 380
Optical stress coef.: 1.1 1/Pa*10¹²
Abrasion: 1

Climatic resistance: 1
Staining: 1
Resistance to acids: 3.2
Resistance to alkalis: 2.2
Phosphate resistance: 3.2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	79
20 ~ 300	88

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		3.3
20 ~ 40		4.7
60 ~ 80		5.5
-40 ~ -20	e	6.6
20 ~ 40	e	8.5
60 ~ 80	e	9.5
-40 ~ -20	g	10.6
20 ~ 40	g	13.1
60 ~ 80	g	14.5

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		5.6
20 ~ 40		6.2
60 ~ 80		6.6
-40 ~ -20	e	9
20 ~ 40	e	10
60 ~ 80	e	10.7
-40 ~ -20	g	13.1
20 ~ 40	g	14.7
60 ~ 80	g	15.8