N-LAK8 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.713003 n_e = 1.716160	V_d = 53.83 V_e = 53.61	n_F - n_C = 0.013245 n_F' - n_C' = 0.013358	Coloring: 0.37 - 0.30 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.33183167 C2 = 0.546623206 C3 = 1.19084015 C4 = 0.00620023871 C5 = 0.0216465439 C6 = 82.5827736

Refraction index
n _2.3254	1.672943
n _1.9701	1.680750
n _1.5296	1.688898
n _1.06	1.697102
n _t	1.698021
n _s	1.701810
n _r	1.706676
n _C	1.708973
n _C'	1.709615
n _0.6328	1.710215
n _D	1.712885
n _d	1.713003
n _e	1.716160
n _F	1.722218
n _F'	1.722974
n _g	1.729437
n _h	1.735445
n _i	1.745729
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8268
P_C,A'	0.3483
P_d,C	0.3042
P_e,C	0.5425
P_g,d	1.2407
P_g,F	0.5449
P_h,g	0.4536
P_i,g	1.2300
P_C',t	0.8753
P_e,C'	0.4940
P_F',e	0.5144
P_i,F'	1.7179

transmittance: 10 mm
τ_2.5	0.4
τ_2.3254	0.71
τ_1.9701	0.95
τ_1.5296	0.992
τ_1.06	0.998
τ_0.7	0.998
τ_0.66	0.998
τ_0.62	0.998
τ_0.58	0.998
τ_0.54607	0.998
τ_0.5	0.998
τ_0.46	0.995
τ_0.4358	0.992
τ_0.42	0.988
τ_0.4047	0.981
τ_0.4	0.977
τ_0.39	0.965
τ_0.38	0.95
τ_0.37	0.91
τ_0.365	0.88
τ_0.35	0.74
τ_0.3341	0.51
τ_0.32	0.28
τ_0.31	0.16

transmittance: 25 mm
τ_2.5	0.1
τ_2.3254	0.42
τ_1.9701	0.88
τ_1.5296	0.979
τ_1.06	0.994
τ_0.7	0.996
τ_0.66	0.995
τ_0.62	0.994
τ_0.58	0.994
τ_0.54607	0.995
τ_0.5	0.994
τ_0.46	0.987
τ_0.4358	0.979
τ_0.42	0.97
τ_0.4047	0.952
τ_0.4	0.94
τ_0.39	0.92
τ_0.38	0.87
τ_0.37	0.78
τ_0.365	0.72
τ_0.35	0.47
τ_0.3341	0.19
τ_0.32	0.04
τ_0.31	0.01

Density: 3.75 g/cm³
Poisson coef.: 0.289
Young module: 1150 Pa*10⁸
Knoop hardness: 740
Optical stress coef.: 1.81 1/Pa*10¹²
Abrasion: 2

Climatic resistance: 3
Staining: 2
Resistance to acids: 52.3
Resistance to alkalis: 1
Phosphate resistance: 3.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	56
20 ~ 300	67

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.7
20 ~ 40		2.6
60 ~ 80		3.1
-40 ~ -20	e	2.4
20 ~ 40	e	3.5
60 ~ 80	e	4.1
-40 ~ -20	g	3
20 ~ 40	g	4.3
60 ~ 80	g	5

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		4
20 ~ 40		4.1
60 ~ 80		4.3
-40 ~ -20	e	4.7
20 ~ 40	e	5
60 ~ 80	e	5.2
-40 ~ -20	g	5.4
20 ~ 40	g	5.8
60 ~ 80	g	6.2