N-SF56 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.784702 n_e = 1.791787	V_d = 26.09 V_e = 25.88	n_F - n_C = 0.030070 n_F' - n_C' = 0.030587	Coloring: 0.45 - 0.37 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.73562085 C2 = 0.317487012 C3 = 1.95398203 C4 = 0.0129624742 C5 = 0.0612884288 C6 = 161.559441

Refraction index
n _2.3254	1.730101
n _1.9701	1.736640
n _1.5296	1.744306
n _1.06	1.754422
n _t	1.755813
n _s	1.762130
n _r	1.771372
n _C	1.776067
n _C'	1.777410
n _0.6328	1.778676
n _D	1.784443
n _d	1.784702
n _e	1.791787
n _F	1.806138
n _F'	1.807998
n _g	1.824597
n _h	1.841262
n _i	1.873233
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.6735
P_C,A'	0.3069
P_d,C	0.2871
P_e,C	0.5227
P_g,d	1.3267
P_g,F	0.6138
P_h,g	0.5541
P_i,g	1.6173
P_C',t	0.7182
P_e,C'	0.4781
P_F',e	0.5390
P_i,F'	2.1694

transmittance: 10 mm
τ_2.5	0.89
τ_2.3254	0.92
τ_1.9701	0.976
τ_1.5296	0.996
τ_1.06	0.998
τ_0.7	0.994
τ_0.66	0.992
τ_0.62	0.991
τ_0.58	0.991
τ_0.54607	0.987
τ_0.5	0.976
τ_0.46	0.959
τ_0.4358	0.94
τ_0.42	0.9
τ_0.4047	0.83
τ_0.4	0.79
τ_0.39	0.66
τ_0.38	0.41

transmittance: 25 mm
τ_2.5	0.74
τ_2.3254	0.81
τ_1.9701	0.94
τ_1.5296	0.99
τ_1.06	0.995
τ_0.7	0.985
τ_0.66	0.98
τ_0.62	0.978
τ_0.58	0.977
τ_0.54607	0.969
τ_0.5	0.94
τ_0.46	0.9
τ_0.4358	0.85
τ_0.42	0.77
τ_0.4047	0.63
τ_0.4	0.56
τ_0.39	0.35
τ_0.38	0.11

Density: 3.28 g/cm³
Poisson coef.: 0.255
Young module: 910 Pa*10⁸
Knoop hardness: 560
Optical stress coef.: 2.87 1/Pa*10¹²
Abrasion: 5

Climatic resistance: 1
Staining: 0
Resistance to acids: 1
Resistance to alkalis: 1.3
Phosphate resistance: 1

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	87
20 ~ 300	100

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-2.5
20 ~ 40		-1.8
60 ~ 80		-1.4
-40 ~ -20	e	-0.7
20 ~ 40	e	0.5
60 ~ 80	e	1.2
-40 ~ -20	g	1.8
20 ~ 40	g	3.5
60 ~ 80	g	4.6

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-0.1
20 ~ 40		-0.3
60 ~ 80		-0.2
-40 ~ -20	e	1.7
20 ~ 40	e	2
60 ~ 80	e	2.4
-40 ~ -20	g	4.3
20 ~ 40	g	5.1
60 ~ 80	g	5.9