N-LAK9 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.691002 n_e = 1.694012	V_d = 54.70 V_e = 54.48	n_F - n_C = 0.012630 n_F' - n_C' = 0.012738	Coloring: 0.37 - 0.30 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.46231905 C2 = 0.344399589 C3 = 1.15508372 C4 = 0.00724270156 C5 = 0.0243353131 C6 = 85.4686868

Refraction index
n _2.3254	1.652942
n _1.9701	1.660323
n _1.5296	1.668043
n _1.06	1.675840
n _t	1.676716
n _s	1.680326
n _r	1.684966
n _C	1.687158
n _C'	1.687771
n _0.6328	1.688342
n _D	1.690889
n _d	1.691002
n _e	1.694012
n _F	1.699789
n _F'	1.700509
n _g	1.706668
n _h	1.712393
n _i	1.722189
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8267
P_C,A'	0.3484
P_d,C	0.3042
P_e,C	0.5426
P_g,d	1.2403
P_g,F	0.5446
P_h,g	0.4532
P_i,g	1.2288
P_C',t	0.8752
P_e,C'	0.4941
P_F',e	0.5143
P_i,F'	1.7164

transmittance: 10 mm
τ_2.5	0.51
τ_2.3254	0.76
τ_1.9701	0.963
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	0.997
τ_0.54607	0.997
τ_0.5	0.996
τ_0.46	0.996
τ_0.4358	0.994
τ_0.42	0.99
τ_0.4047	0.983
τ_0.4	0.98
τ_0.39	0.971
τ_0.38	0.954
τ_0.37	0.92
τ_0.365	0.91
τ_0.35	0.79
τ_0.3341	0.56
τ_0.32	0.28

transmittance: 25 mm
τ_2.5	0.19
τ_2.3254	0.5
τ_1.9701	0.91
τ_1.5296	0.98
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	0.992
τ_0.5	0.991
τ_0.46	0.99
τ_0.4358	0.984
τ_0.42	0.975
τ_0.4047	0.958
τ_0.4	0.95
τ_0.39	0.93
τ_0.38	0.89
τ_0.37	0.82
τ_0.365	0.78
τ_0.35	0.55
τ_0.3341	0.23
τ_0.32	0.04

Density: 3.51 g/cm³
Poisson coef.: 0.285
Young module: 1100 Pa*10⁸
Knoop hardness: 700
Optical stress coef.: 1.83 1/Pa*10¹²

Climatic resistance: 3
Staining: 3
Resistance to acids: 52
Resistance to alkalis: 1.2
Phosphate resistance: 4.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	63
20 ~ 300	75

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0.8
20 ~ 40		1.5
60 ~ 80		2
-40 ~ -20	e	1.6
20 ~ 40	e	2.2
60 ~ 80	e	2.7
-40 ~ -20	g	2.3
20 ~ 40	g	2.9
60 ~ 80	g	3.3

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		3
20 ~ 40		2.9
60 ~ 80		3.1
-40 ~ -20	e	3.9
20 ~ 40	e	3.7
60 ~ 80	e	3.8
-40 ~ -20	g	4.6
20 ~ 40	g	4.4
60 ~ 80	g	4.4