N-LAF3 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.716998 n_e = 1.720554	V_d = 47.96 V_e = 47.68	n_F - n_C = 0.014949 n_F' - n_C' = 0.015111	Coloring: 0.39 - 0.34 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.73155854 C2 = 0.150874455 C3 = 1.06586596 C4 = 0.00953833914 C5 = 0.0407887211 C6 = 98.0758545

Refraction index
n _2.3254	1.680607
n _1.9701	1.686529
n _1.5296	1.692970
n _1.06	1.700173
n _t	1.701054
n _s	1.704849
n _r	1.710011
n _C	1.712521
n _C'	1.713229
n _0.6328	1.713892
n _D	1.716866
n _d	1.716998
n _e	1.720554
n _F	1.727471
n _F'	1.728341
n _g	1.735847
n _h	1.742929
n _i	1.755298
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7670
P_C,A'	0.3344
P_d,C	0.2994
P_e,C	0.5372
P_g,d	1.2608
P_g,F	0.5603
P_h,g	0.4736
P_i,g	1.3010
P_C',t	0.8143
P_e,C'	0.4899
P_F',e	0.5208
P_i,F'	1.8031

transmittance: 10 mm
τ_2.5	0.63
τ_2.3254	0.8
τ_1.9701	0.95
τ_1.5296	0.99
τ_1.06	0.996
τ_0.7	0.995
τ_0.66	0.994
τ_0.62	0.994
τ_0.58	0.994
τ_0.54607	0.994
τ_0.5	0.992
τ_0.46	0.984
τ_0.4358	0.98
τ_0.42	0.976
τ_0.4047	0.963
τ_0.4	0.959
τ_0.39	0.94
τ_0.38	0.9
τ_0.37	0.81
τ_0.365	0.74
τ_0.35	0.38

transmittance: 25 mm
τ_2.5	0.31
τ_2.3254	0.58
τ_1.9701	0.88
τ_1.5296	0.976
τ_1.06	0.99
τ_0.7	0.988
τ_0.66	0.985
τ_0.62	0.984
τ_0.58	0.984
τ_0.54607	0.985
τ_0.5	0.98
τ_0.46	0.96
τ_0.4358	0.95
τ_0.42	0.94
τ_0.4047	0.91
τ_0.4	0.9
τ_0.39	0.85
τ_0.38	0.76
τ_0.37	0.59
τ_0.365	0.47
τ_0.35	0.09

Density: 4.14 g/cm³
Poisson coef.: 0.286
Young module: 950 Pa*10⁸
Knoop hardness: 580
Optical stress coef.: 1.53 1/Pa*10¹²
Abrasion: 5

Climatic resistance: 2
Staining: 3
Resistance to acids: 52.3
Resistance to alkalis: 1.2
Phosphate resistance: 3.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	76
20 ~ 300	87

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-1.7
20 ~ 40		-0.9
60 ~ 80		-0.4
-40 ~ -20	e	-0.8
20 ~ 40	e	0.1
60 ~ 80	e	0.7
-40 ~ -20	g	0.1
20 ~ 40	g	1.2
60 ~ 80	g	1.8

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0.6
20 ~ 40		0.6
60 ~ 80		0.7
-40 ~ -20	e	1.5
20 ~ 40	e	1.6
60 ~ 80	e	1.8
-40 ~ -20	g	2.5
20 ~ 40	g	2.7
60 ~ 80	g	3