N-LAF7 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.749499 n_e = 1.754593	V_d = 34.81 V_e = 34.56	n_F - n_C = 0.021525 n_F' - n_C' = 0.021832	Coloring: 0.46 - 0.36 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.74028764 C2 = 0.226710554 C3 = 1.32525548 C4 = 0.010792558 C5 = 0.0538626639 C6 = 106.268665

Refraction index
n _2.3254	1.703440
n _1.9701	1.710205
n _1.5296	1.717722
n _1.06	1.726594
n _t	1.727728
n _s	1.732715
n _r	1.739719
n _C	1.743198
n _C'	1.744185
n _0.6328	1.745114
n _D	1.749312
n _d	1.749499
n _e	1.754593
n _F	1.764723
n _F'	1.766018
n _g	1.777411
n _h	1.788540
n _i	1.809026
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7186
P_C,A'	0.3197
P_d,C	0.2927
P_e,C	0.5293
P_g,d	1.2966
P_g,F	0.5894
P_h,g	0.5170
P_i,g	1.4687
P_C',t	0.7645
P_e,C'	0.4835
P_F',e	0.5307
P_i,F'	1.9980

transmittance: 10 mm
τ_2.5	0.68
τ_2.3254	0.87
τ_1.9701	0.976
τ_1.5296	0.996
τ_1.06	0.998
τ_0.7	0.997
τ_0.66	0.995
τ_0.62	0.994
τ_0.58	0.992
τ_0.54607	0.988
τ_0.5	0.971
τ_0.46	0.94
τ_0.4358	0.9
τ_0.42	0.86
τ_0.4047	0.78
τ_0.4	0.75
τ_0.39	0.66
τ_0.38	0.51
τ_0.37	0.3
τ_0.365	0.17

transmittance: 25 mm
τ_2.5	0.38
τ_2.3254	0.7
τ_1.9701	0.94
τ_1.5296	0.99
τ_1.06	0.996
τ_0.7	0.992
τ_0.66	0.988
τ_0.62	0.985
τ_0.58	0.98
τ_0.54607	0.97
τ_0.5	0.93
τ_0.46	0.85
τ_0.4358	0.77
τ_0.42	0.68
τ_0.4047	0.54
τ_0.4	0.49
τ_0.39	0.35
τ_0.38	0.19
τ_0.37	0.05
τ_0.365	0.01

Density: 3.73 g/cm³
Poisson coef.: 0.271
Young module: 960 Pa*10⁸
Knoop hardness: 530
Optical stress coef.: 2.57 1/Pa*10¹²
Abrasion: 5

Climatic resistance: 1
Staining: 2
Resistance to acids: 51.3
Resistance to alkalis: 1.2
Phosphate resistance: 1.2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	73
20 ~ 300	84

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0.2
20 ~ 40		1.1
60 ~ 80		1.6
-40 ~ -20	e	1.5
20 ~ 40	e	2.7
60 ~ 80	e	3.4
-40 ~ -20	g	3.1
20 ~ 40	g	4.7
60 ~ 80	g	5.6

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		2.5
20 ~ 40		2.6
60 ~ 80		2.7
-40 ~ -20	e	3.9
20 ~ 40	e	4.2
60 ~ 80	e	4.6
-40 ~ -20	g	5.6
20 ~ 40	g	6.2
60 ~ 80	g	6.8