SF4 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.755201 n_e = 1.761667	V_d = 27.57 V_e = 27.36	n_F - n_C = 0.027382 n_F' - n_C' = 0.027829	Coloring: 0.40 - 0.35 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.61957826 C2 = 0.339493189 C3 = 1.02566931 C4 = 0.0125502104 C5 = 0.0544559822 C6 = 117.652222

Refraction index
n _2.3254	1.707887
n _1.9701	1.712940
n _1.5296	1.719036
n _1.06	1.727648
n _t	1.728881
n _s	1.734564
n _r	1.742998
n _C	1.747298
n _C'	1.748528
n _0.6328	1.749687
n _D	1.754964
n _d	1.755201
n _e	1.761667
n _F	1.774680
n _F'	1.776357
n _g	1.791209
n _h	1.805889
n _i	1.833303
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.6725
P_C,A'	0.3084
P_d,C	0.2886
P_e,C	0.5247
P_g,d	1.3150
P_g,F	0.6036
P_h,g	0.5360
P_i,g	1.5372
P_C',t	0.7175
P_e,C'	0.4798
P_F',e	0.5364
P_i,F'	2.0796

transmittance: 10 mm
τ_2.5	0.85
τ_2.3254	0.89
τ_1.9701	0.963
τ_1.5296	0.996
τ_1.06	0.999
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	0.992
τ_0.4358	0.987
τ_0.42	0.98
τ_0.4047	0.963
τ_0.4	0.95
τ_0.39	0.92
τ_0.38	0.86
τ_0.37	0.74
τ_0.365	0.6

transmittance: 25 mm
τ_2.5	0.66
τ_2.3254	0.75
τ_1.9701	0.91
τ_1.5296	0.989
τ_1.06	0.998
τ_0.7	0.997
τ_0.66	0.997
τ_0.62	0.997
τ_0.58	0.996
τ_0.54607	0.996
τ_0.5	0.991
τ_0.46	0.98
τ_0.4358	0.967
τ_0.42	0.95
τ_0.4047	0.91
τ_0.4	0.88
τ_0.39	0.82
τ_0.38	0.69
τ_0.37	0.47
τ_0.365	0.28

Density: 4.79 g/cm³
Poisson coef.: 0.241
Young module: 560 Pa*10⁸
Knoop hardness: 390
Optical stress coef.: 1.36 1/Pa*10¹²
Abrasion: 1

Climatic resistance: 1
Staining: 2
Resistance to acids: 4.3
Resistance to alkalis: 2.3
Phosphate resistance: 3.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	80
20 ~ 300	89

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		2.8
20 ~ 40		4.3
60 ~ 80		4.9
-40 ~ -20	e	5.7
20 ~ 40	e	7.7
60 ~ 80	e	8.5
-40 ~ -20	g	9.4
20 ~ 40	g	11.8
60 ~ 80	g	13

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		5.1
20 ~ 40		5.7
60 ~ 80		6
-40 ~ -20	e	8.1
20 ~ 40	e	9.2
60 ~ 80	e	9.7
-40 ~ -20	g	11.8
20 ~ 40	g	13.3
60 ~ 80	g	14.2