N-LAK33 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.753976 n_e = 1.757403	V_d = 52.43 V_e = 52.19	n_F - n_C = 0.014380 n_F' - n_C' = 0.014509	Coloring: 0.39 - 0.32 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.45796869 C2 = 0.555403936 C3 = 1.19938794 C4 = 0.0068054528 C5 = 0.0225253283 C6 = 82.7543327

Refraction index
n _2.3254	1.712799
n _1.9701	1.720509
n _1.5296	1.728620
n _1.06	1.736983
n _t	1.737941
n _s	1.741933
n _r	1.747138
n _C	1.749615
n _C'	1.750309
n _0.6328	1.750957
n _D	1.753849
n _d	1.753976
n _e	1.757403
n _F	1.763996
n _F'	1.764819
n _g	1.771867
n _h	1.778427
n _i	1.789670
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8118
P_C,A'	0.3451
P_d,C	0.3032
P_e,C	0.5415
P_g,d	1.2440
P_g,F	0.5473
P_h,g	0.4562
P_i,g	1.2380
P_C',t	0.8600
P_e,C'	0.4933
P_F',e	0.5156
P_i,F'	1.7281

transmittance: 10 mm
τ_2.5	0.38
τ_2.3254	0.69
τ_1.9701	0.94
τ_1.5296	0.99
τ_1.06	0.998
τ_0.7	0.996
τ_0.66	0.996
τ_0.62	0.996
τ_0.58	0.996
τ_0.54607	0.996
τ_0.5	0.995
τ_0.46	0.991
τ_0.4358	0.987
τ_0.42	0.981
τ_0.4047	0.971
τ_0.4	0.963
τ_0.39	0.94
τ_0.38	0.91
τ_0.37	0.86
τ_0.365	0.83
τ_0.35	0.69
τ_0.3341	0.46
τ_0.32	0.21

transmittance: 25 mm
τ_2.5	0.09
τ_2.3254	0.4
τ_1.9701	0.85
τ_1.5296	0.975
τ_1.06	0.995
τ_0.7	0.991
τ_0.66	0.99
τ_0.62	0.99
τ_0.58	0.99
τ_0.54607	0.99
τ_0.5	0.987
τ_0.46	0.977
τ_0.4358	0.967
τ_0.42	0.954
τ_0.4047	0.93
τ_0.4	0.91
τ_0.39	0.86
τ_0.38	0.79
τ_0.37	0.69
τ_0.365	0.63
τ_0.35	0.4
τ_0.3341	0.14
τ_0.32	0.02

Density: 4.26 g/cm³
Poisson coef.: 0.291
Young module: 1240 Pa*10⁸
Knoop hardness: 780
Optical stress coef.: 1.49 1/Pa*10¹²

Climatic resistance: 1
Staining: 1
Resistance to acids: 51.3
Resistance to alkalis: 1
Phosphate resistance: 2.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	60
20 ~ 300	70

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0.8
20 ~ 40		1.9
60 ~ 80		2.2
-40 ~ -20	e	1.7
20 ~ 40	e	2.9
60 ~ 80	e	3.2
-40 ~ -20	g	2.5
20 ~ 40	g	3.7
60 ~ 80	g	4

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		3.1
20 ~ 40		3.4
60 ~ 80		3.3
-40 ~ -20	e	4.1
20 ~ 40	e	4.4
60 ~ 80	e	4.4
-40 ~ -20	g	5
20 ~ 40	g	5.3
60 ~ 80	g	5.2