N-LAF2 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.743972 n_e = 1.747914	V_d = 44.85 V_e = 44.57	n_F - n_C = 0.016587 n_F' - n_C' = 0.016780	Coloring: 0.40 - 0.34 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.80984227 C2 = 0.15729555 C3 = 1.0930037 C4 = 0.0101711622 C5 = 0.0442431765 C6 = 100.687748

Refraction index
n _2.3254	1.705817
n _1.9701	1.711690
n _1.5296	1.718158
n _1.06	1.725625
n _t	1.726562
n _s	1.730640
n _r	1.736270
n _C	1.739029
n _C'	1.739809
n _0.6328	1.740540
n _D	1.743826
n _d	1.743972
n _e	1.747914
n _F	1.755617
n _F'	1.756589
n _g	1.765000
n _h	1.772979
n _i	1.787028
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7516
P_C,A'	0.3305
P_d,C	0.2979
P_e,C	0.5356
P_g,d	1.2676
P_g,F	0.5656
P_h,g	0.4810
P_i,g	1.3279
P_C',t	0.7985
P_e,C'	0.4886
P_F',e	0.5229
P_i,F'	1.8350

transmittance: 10 mm
τ_2.5	0.69
τ_2.3254	0.86
τ_1.9701	0.971
τ_1.5296	0.996
τ_1.06	0.999
τ_0.7	0.998
τ_0.66	0.997
τ_0.62	0.997
τ_0.58	0.997
τ_0.54607	0.998
τ_0.5	0.993
τ_0.46	0.985
τ_0.4358	0.976
τ_0.42	0.965
τ_0.4047	0.94
τ_0.4	0.93
τ_0.39	0.9
τ_0.38	0.83
τ_0.37	0.71
τ_0.365	0.63
τ_0.35	0.23

transmittance: 25 mm
τ_2.5	0.4
τ_2.3254	0.69
τ_1.9701	0.93
τ_1.5296	0.99
τ_1.06	0.997
τ_0.7	0.996
τ_0.66	0.993
τ_0.62	0.992
τ_0.58	0.993
τ_0.54607	0.994
τ_0.5	0.983
τ_0.46	0.962
τ_0.4358	0.94
τ_0.42	0.92
τ_0.4047	0.87
τ_0.4	0.84
τ_0.39	0.76
τ_0.38	0.63
τ_0.37	0.43
τ_0.365	0.31
τ_0.35	0.03

Density: 4.3 g/cm³
Poisson coef.: 0.288
Young module: 940 Pa*10⁸
Knoop hardness: 530
Optical stress coef.: 1.42 1/Pa*10¹²
Abrasion: 6

Climatic resistance: 2
Staining: 3
Resistance to acids: 52.2
Resistance to alkalis: 1
Phosphate resistance: 2.2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	81
20 ~ 300	91

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-2.3
20 ~ 40		-1.6
60 ~ 80		-1.2
-40 ~ -20	e	-1.3
20 ~ 40	e	-0.5
60 ~ 80	e	0
-40 ~ -20	g	-0.3
20 ~ 40	g	0.7
60 ~ 80	g	1.3

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0
20 ~ 40		-0.1
60 ~ 80		-0.1
-40 ~ -20	e	1
20 ~ 40	e	1
60 ~ 80	e	1.2
-40 ~ -20	g	2.1
20 ~ 40	g	2.3
60 ~ 80	g	2.5