N-LAK21 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.640494 n_e = 1.643036	V_d = 60.10 V_e = 59.85	n_F - n_C = 0.010656 n_F' - n_C' = 0.010742	Coloring: 0.37 - 0.31 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.22718116 C2 = 0.420783743 C3 = 1.01284843 C4 = 0.00602075682 C5 = 0.0196862889 C6 = 88.4370099

Refraction index
n _2.3254	1.607764
n _1.9701	1.614163
n _1.5296	1.620857
n _1.06	1.627589
n _t	1.628340
n _s	1.631431
n _r	1.635382
n _C	1.637241
n _C'	1.637760
n _0.6328	1.638245
n _D	1.640399
n _d	1.640494
n _e	1.643036
n _F	1.647898
n _F'	1.648503
n _g	1.653664
n _h	1.658442
n _i	1.666573
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8352
P_C,A'	0.3508
P_d,C	0.3052
P_e,C	0.5437
P_g,d	1.2358
P_g,F	0.5410
P_h,g	0.4483
P_i,g	1.2113
P_C',t	0.8839
P_e,C'	0.4950
P_F',e	0.5129
P_i,F'	1.6956

transmittance: 10 mm
τ_2.5	0.54
τ_2.3254	0.75
τ_1.9701	0.95
τ_1.5296	0.988
τ_1.06	0.998
τ_0.7	0.998
τ_0.66	0.997
τ_0.62	0.996
τ_0.58	0.997
τ_0.54607	0.997
τ_0.5	0.996
τ_0.46	0.992
τ_0.4358	0.988
τ_0.42	0.985
τ_0.4047	0.979
τ_0.4	0.976
τ_0.39	0.963
τ_0.38	0.94
τ_0.37	0.91
τ_0.365	0.88
τ_0.35	0.74
τ_0.3341	0.47
τ_0.32	0.21

transmittance: 25 mm
τ_2.5	0.21
τ_2.3254	0.49
τ_1.9701	0.87
τ_1.5296	0.97
τ_1.06	0.994
τ_0.7	0.994
τ_0.66	0.993
τ_0.62	0.991
τ_0.58	0.992
τ_0.54607	0.993
τ_0.5	0.99
τ_0.46	0.98
τ_0.4358	0.97
τ_0.42	0.963
τ_0.4047	0.95
τ_0.4	0.94
τ_0.39	0.91
τ_0.38	0.86
τ_0.37	0.78
τ_0.365	0.72
τ_0.35	0.47
τ_0.3341	0.15
τ_0.32	0.02

Density: 3.74 g/cm³
Poisson coef.: 0.272
Young module: 910 Pa*10⁸
Knoop hardness: 600
Optical stress coef.: 1.74 1/Pa*10¹²
Abrasion: 5

Climatic resistance: 4
Staining: 2
Resistance to acids: 53.2
Resistance to alkalis: 4.3
Phosphate resistance: 4.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	68
20 ~ 300	81

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-1.6
20 ~ 40		-0.9
60 ~ 80		-0.4
-40 ~ -20	e	-1.2
20 ~ 40	e	-0.4
60 ~ 80	e	0.1
-40 ~ -20	g	-0.7
20 ~ 40	g	0.1
60 ~ 80	g	0.7

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0.6
20 ~ 40		0.5
60 ~ 80		0.7
-40 ~ -20	e	1.1
20 ~ 40	e	1
60 ~ 80	e	1.3
-40 ~ -20	g	1.6
20 ~ 40	g	1.6
60 ~ 80	g	1.9