N-LAK12 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.677900 n_e = 1.680827	V_d = 55.19 V_e = 54.92	n_F - n_C = 0.012280 n_F' - n_C' = 0.012395	Coloring: 0.37 - 0.31 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.17365704 C2 = 0.588992398 C3 = 0.978014394 C4 = 0.00577031797 C5 = 0.0200401678 C6 = 95.4873482

Refraction index
n _2.3254	1.645413
n _1.9701	1.651065
n _1.5296	1.657128
n _1.06	1.663658
n _t	1.664432
n _s	1.667715
n _r	1.672085
n _C	1.674186
n _C'	1.674775
n _0.6328	1.675326
n _D	1.677790
n _d	1.677900
n _e	1.680827
n _F	1.686467
n _F'	1.687171
n _g	1.693203
n _h	1.698815
n _i	1.708417
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7941
P_C,A'	0.3417
P_d,C	0.3024
P_e,C	0.5407
P_g,d	1.2461
P_g,F	0.5485
P_h,g	0.4569
P_i,g	1.2387
P_C',t	0.8421
P_e,C'	0.4927
P_F',e	0.5166
P_i,F'	1.7299

transmittance: 10 mm
τ_2.5	0.59
τ_2.3254	0.76
τ_1.9701	0.94
τ_1.5296	0.99
τ_1.06	0.997
τ_0.7	0.997
τ_0.66	0.996
τ_0.62	0.995
τ_0.58	0.996
τ_0.54607	0.996
τ_0.5	0.994
τ_0.46	0.987
τ_0.4358	0.983
τ_0.42	0.981
τ_0.4047	0.977
τ_0.4	0.976
τ_0.39	0.967
τ_0.38	0.95
τ_0.37	0.91
τ_0.365	0.88
τ_0.35	0.73
τ_0.3341	0.47
τ_0.32	0.16

transmittance: 25 mm
τ_2.5	0.27
τ_2.3254	0.51
τ_1.9701	0.85
τ_1.5296	0.975
τ_1.06	0.992
τ_0.7	0.993
τ_0.66	0.989
τ_0.62	0.988
τ_0.58	0.99
τ_0.54607	0.991
τ_0.5	0.986
τ_0.46	0.968
τ_0.4358	0.958
τ_0.42	0.952
τ_0.4047	0.94
τ_0.4	0.94
τ_0.39	0.92
τ_0.38	0.87
τ_0.37	0.79
τ_0.365	0.73
τ_0.35	0.46
τ_0.3341	0.15
τ_0.32	0.01

Density: 4.1 g/cm³
Poisson coef.: 0.288
Young module: 870 Pa*10⁸
Knoop hardness: 560
Optical stress coef.: 1.44 1/Pa*10¹²
Abrasion: 6

Climatic resistance: 3
Staining: 1
Resistance to acids: 53.3
Resistance to alkalis: 3.3
Phosphate resistance: 4.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	76
20 ~ 300	93

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-3.2
20 ~ 40		-2.7
60 ~ 80		-2.3
-40 ~ -20	e	-2.6
20 ~ 40	e	-1.9
60 ~ 80	e	-1.5
-40 ~ -20	g	-2
20 ~ 40	g	-1.2
60 ~ 80	g	-0.7

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-1
20 ~ 40		-1.2
60 ~ 80		-1.2
-40 ~ -20	e	-0.3
20 ~ 40	e	-0.4
60 ~ 80	e	-0.3
-40 ~ -20	g	0.3
20 ~ 40	g	0.3
60 ~ 80	g	0.5