N-LAF32 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.794568 n_e = 1.798720	V_d = 45.52 V_e = 45.27	n_F - n_C = 0.017452 n_F' - n_C' = 0.017639	Coloring: 0.40 - 0.34 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.91731106 C2 = 0.224019825 C3 = 1.22087075 C4 = 0.00978600358 C5 = 0.0386141473 C6 = 84.6431265

Refraction index
n _2.3254	1.750171
n _1.9701	1.757769
n _1.5296	1.765909
n _1.06	1.774746
n _t	1.775805
n _s	1.780321
n _r	1.786395
n _C	1.789336
n _C'	1.790164
n _0.6328	1.790939
n _D	1.794414
n _d	1.794568
n _e	1.798720
n _F	1.806789
n _F'	1.807804
n _g	1.816558
n _h	1.824818
n _i	1.839242
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7753
P_C,A'	0.3359
P_d,C	0.2997
P_e,C	0.5376
P_g,d	1.2599
P_g,F	0.5597
P_h,g	0.4732
P_i,g	1.2997
P_C',t	0.8227
P_e,C'	0.4902
P_F',e	0.5204
P_i,F'	1.8013

transmittance: 10 mm
τ_2.5	0.43
τ_2.3254	0.72
τ_1.9701	0.94
τ_1.5296	0.986
τ_1.06	0.997
τ_0.7	0.998
τ_0.66	0.998
τ_0.62	0.997
τ_0.58	0.997
τ_0.54607	0.998
τ_0.5	0.995
τ_0.46	0.987
τ_0.4358	0.979
τ_0.42	0.97
τ_0.4047	0.95
τ_0.4	0.94
τ_0.39	0.91
τ_0.38	0.85
τ_0.37	0.75
τ_0.365	0.67
τ_0.35	0.36

transmittance: 25 mm
τ_2.5	0.12
τ_2.3254	0.44
τ_1.9701	0.86
τ_1.5296	0.966
τ_1.06	0.993
τ_0.7	0.995
τ_0.66	0.994
τ_0.62	0.993
τ_0.58	0.993
τ_0.54607	0.994
τ_0.5	0.988
τ_0.46	0.969
τ_0.4358	0.95
τ_0.42	0.93
τ_0.4047	0.88
τ_0.4	0.86
τ_0.39	0.79
τ_0.38	0.67
τ_0.37	0.48
τ_0.365	0.37
τ_0.35	0.08

Density: 4.33 g/cm³
Poisson coef.: 0.291
Young module: 1230 Pa*10⁸
Knoop hardness: 760
Optical stress coef.: 1.59 1/Pa*10¹²
Abrasion: 2

Climatic resistance: 1
Staining: 1
Resistance to acids: 51.2
Resistance to alkalis: 1
Phosphate resistance: 2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	59
20 ~ 300	70

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.9
20 ~ 40		2.8
60 ~ 80		3.3
-40 ~ -20	e	2.9
20 ~ 40	e	4.1
60 ~ 80	e	4.7
-40 ~ -20	g	3.9
20 ~ 40	g	5.3
60 ~ 80	g	6

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		4.2
20 ~ 40		4.3
60 ~ 80		4.5
-40 ~ -20	e	5.4
20 ~ 40	e	5.6
60 ~ 80	e	5.9
-40 ~ -20	g	6.4
20 ~ 40	g	6.9
60 ~ 80	g	7.3