N-LAK10 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.720028 n_e = 1.723414	V_d = 50.62 V_e = 50.38	n_F - n_C = 0.014223 n_F' - n_C' = 0.014357	Coloring: 0.39 - 0.34 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.72878017 C2 = 0.169257825 C3 = 1.19386956 C4 = 0.00886014635 C5 = 0.0363416509 C6 = 82.9009069

Refraction index
n _2.3254	1.678902
n _1.9701	1.686698
n _1.5296	1.694876
n _1.06	1.703241
n _t	1.704193
n _s	1.708146
n _r	1.713282
n _C	1.715724
n _C'	1.716408
n _0.6328	1.717048
n _D	1.719901
n _d	1.720028
n _e	1.723414
n _F	1.729948
n _F'	1.730766
n _g	1.737792
n _h	1.744376
n _i	1.755776
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8107
P_C,A'	0.3441
P_d,C	0.3025
P_e,C	0.5406
P_g,d	1.2489
P_g,F	0.5514
P_h,g	0.4628
P_i,g	1.2644
P_C',t	0.8588
P_e,C'	0.4925
P_F',e	0.5168
P_i,F'	1.7583

transmittance: 10 mm
τ_2.5	0.46
τ_2.3254	0.73
τ_1.9701	0.959
τ_1.5296	0.993
τ_1.06	0.998
τ_0.7	0.998
τ_0.66	0.998
τ_0.62	0.998
τ_0.58	0.997
τ_0.54607	0.998
τ_0.5	0.996
τ_0.46	0.992
τ_0.4358	0.987
τ_0.42	0.981
τ_0.4047	0.97
τ_0.4	0.964
τ_0.39	0.95
τ_0.38	0.91
τ_0.37	0.83
τ_0.365	0.77
τ_0.35	0.44

transmittance: 25 mm
τ_2.5	0.14
τ_2.3254	0.46
τ_1.9701	0.9
τ_1.5296	0.983
τ_1.06	0.995
τ_0.7	0.995
τ_0.66	0.994
τ_0.62	0.994
τ_0.58	0.993
τ_0.54607	0.994
τ_0.5	0.991
τ_0.46	0.981
τ_0.4358	0.969
τ_0.42	0.954
τ_0.4047	0.93
τ_0.4	0.91
τ_0.39	0.87
τ_0.38	0.78
τ_0.37	0.63
τ_0.365	0.52
τ_0.35	0.13

Density: 3.69 g/cm³
Poisson coef.: 0.286
Young module: 1160 Pa*10⁸
Knoop hardness: 780
Optical stress coef.: 1.97 1/Pa*10¹²
Abrasion: 2

Climatic resistance: 2
Staining: 2
Resistance to acids: 52.3
Resistance to alkalis: 1
Phosphate resistance: 3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	57
20 ~ 300	68

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.8
20 ~ 40		2.7
60 ~ 80		3.2
-40 ~ -20	e	2.6
20 ~ 40	e	3.6
60 ~ 80	e	4.3
-40 ~ -20	g	3.4
20 ~ 40	g	4.6
60 ~ 80	g	5.3

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		4.1
20 ~ 40		4.2
60 ~ 80		4.4
-40 ~ -20	e	5
20 ~ 40	e	5.1
60 ~ 80	e	5.4
-40 ~ -20	g	5.8
20 ~ 40	g	6.1
60 ~ 80	g	6.5