N-SF4 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.755131 n_e = 1.761635	V_d = 27.37 V_e = 27.15	n_F - n_C = 0.027582 n_F' - n_C' = 0.028043	Coloring: 0.44 - 0.37 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.67780282 C2 = 0.282849893 C3 = 1.63539276 C4 = 0.012679345 C5 = 0.0602038419 C6 = 145.760496

Refraction index
n _2.3254	1.704339
n _1.9701	1.710517
n _1.5296	1.717727
n _1.06	1.727168
n _t	1.728460
n _s	1.734317
n _r	1.742858
n _C	1.747186
n _C'	1.748423
n _0.6328	1.749588
n _D	1.754892
n _d	1.755131
n _e	1.761635
n _F	1.774769
n _F'	1.776467
n _g	1.791582
n _h	1.806680
n _i	1.835424
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.6788
P_C,A'	0.3086
P_d,C	0.2880
P_e,C	0.5238
P_g,d	1.3215
P_g,F	0.6095
P_h,g	0.5473
P_i,g	1.5894
P_C',t	0.7237
P_e,C'	0.4790
P_F',e	0.5377
P_i,F'	2.1374

transmittance: 10 mm
τ_2.5	0.9
τ_2.3254	0.92
τ_1.9701	0.976
τ_1.5296	0.997
τ_1.06	0.999
τ_0.7	0.995
τ_0.66	0.993
τ_0.62	0.993
τ_0.58	0.993
τ_0.54607	0.99
τ_0.5	0.978
τ_0.46	0.959
τ_0.4358	0.93
τ_0.42	0.9
τ_0.4047	0.82
τ_0.4	0.79
τ_0.39	0.67
τ_0.38	0.46

transmittance: 25 mm
τ_2.5	0.77
τ_2.3254	0.82
τ_1.9701	0.94
τ_1.5296	0.993
τ_1.06	0.997
τ_0.7	0.988
τ_0.66	0.983
τ_0.62	0.983
τ_0.58	0.983
τ_0.54607	0.976
τ_0.5	0.95
τ_0.46	0.9
τ_0.4358	0.84
τ_0.42	0.76
τ_0.4047	0.61
τ_0.4	0.55
τ_0.39	0.37
τ_0.38	0.14

Density: 3.15 g/cm³
Poisson coef.: 0.256
Young module: 900 Pa*10⁸
Knoop hardness: 520
Optical stress coef.: 2.76 1/Pa*10¹²
Abrasion: 6

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

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	95
20 ~ 300	109

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-2.8
20 ~ 40		-2.2
60 ~ 80		-1.9
-40 ~ -20	e	-1.2
20 ~ 40	e	-0.1
60 ~ 80	e	0.4
-40 ~ -20	g	1
20 ~ 40	g	2.6
60 ~ 80	g	3.5

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-0.5
20 ~ 40		-0.7
60 ~ 80		-0.8
-40 ~ -20	e	1.2
20 ~ 40	e	1.4
60 ~ 80	e	1.6
-40 ~ -20	g	3.5
20 ~ 40	g	4.2
60 ~ 80	g	4.7