N-LAF34 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.772500 n_e = 1.776208	V_d = 49.62 V_e = 49.37	n_F - n_C = 0.015568 n_F' - n_C' = 0.015719	Coloring: 0.39 - 0.33 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.75836958 C2 = 0.313537785 C3 = 1.18925231 C4 = 0.00872810026 C5 = 0.0293020832 C6 = 85.1780644

Refraction index
n _2.3254	1.730849
n _1.9701	1.738239
n _1.5296	1.746103
n _1.06	1.754471
n _t	1.755457
n _s	1.759619
n _r	1.765146
n _C	1.767801
n _C'	1.768546
n _0.6328	1.769244
n _D	1.772361
n _d	1.772500
n _e	1.776208
n _F	1.783369
n _F'	1.784266
n _g	1.791961
n _h	1.799153
n _i	1.811547
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7929
P_C,A'	0.3408
P_d,C	0.3017
P_e,C	0.5399
P_g,d	1.2500
P_g,F	0.5518
P_h,g	0.4620
P_i,g	1.2580
P_C',t	0.8408
P_e,C'	0.4920
P_F',e	0.5176
P_i,F'	1.7523

transmittance: 10 mm
τ_2.5	0.43
τ_2.3254	0.73
τ_1.9701	0.95
τ_1.5296	0.994
τ_1.06	0.998
τ_0.7	0.997
τ_0.66	0.997
τ_0.62	0.996
τ_0.58	0.996
τ_0.54607	0.997
τ_0.5	0.996
τ_0.46	0.99
τ_0.4358	0.985
τ_0.42	0.979
τ_0.4047	0.968
τ_0.4	0.963
τ_0.39	0.95
τ_0.38	0.91
τ_0.37	0.87
τ_0.365	0.83
τ_0.35	0.63
τ_0.3341	0.25

transmittance: 25 mm
τ_2.5	0.12
τ_2.3254	0.46
τ_1.9701	0.87
τ_1.5296	0.984
τ_1.06	0.994
τ_0.7	0.993
τ_0.66	0.992
τ_0.62	0.991
τ_0.58	0.991
τ_0.54607	0.993
τ_0.5	0.989
τ_0.46	0.975
τ_0.4358	0.962
τ_0.42	0.95
τ_0.4047	0.92
τ_0.4	0.91
τ_0.39	0.87
τ_0.38	0.8
τ_0.37	0.7
τ_0.365	0.63
τ_0.35	0.31
τ_0.3341	0.03

Density: 4.24 g/cm³
Poisson coef.: 0.292
Young module: 1230 Pa*10⁸
Knoop hardness: 770
Optical stress coef.: 1.44 1/Pa*10¹²
Abrasion: 2

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

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	58
20 ~ 300	70

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.9
20 ~ 40		2.7
60 ~ 80		3.2
-40 ~ -20	e	2.8
20 ~ 40	e	3.9
60 ~ 80	e	4.4
-40 ~ -20	g	3.7
20 ~ 40	g	4.9
60 ~ 80	g	5.5

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		4.2
20 ~ 40		4.3
60 ~ 80		4.4
-40 ~ -20	e	5.2
20 ~ 40	e	5.4
60 ~ 80	e	5.6
-40 ~ -20	g	6.2
20 ~ 40	g	6.5
60 ~ 80	g	6.8