N-LAF21 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.788000 n_e = 1.791949	V_d = 47.48 V_e = 47.24	n_F - n_C = 0.016593 n_F' - n_C' = 0.016762	Coloring: 0.40 - 0.33 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 1.06 mkm.
C1 = 1.88246178 C2 = 0.239703394 C3 = 1.23484815 C4 = 0.00936029744 C5 = 0.0354026371 C6 = 84.3919934

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	1.768930
n _t	1.769965
n _s	1.774350
n _r	1.780193
n _C	1.783008
n _C'	1.783799
n _0.6328	1.784539
n _D	1.787853
n _d	1.788000
n _e	1.791949
n _F	1.799602
n _F'	1.800562
n _g	1.808828
n _h	1.816594
n _i	1.830081
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7860
P_C,A'	0.3387
P_d,C	0.3008
P_e,C	0.5388
P_g,d	1.2551
P_g,F	0.5559
P_h,g	0.4680
P_i,g	1.2807
P_C',t	0.8336
P_e,C'	0.4911
P_F',e	0.5190
P_i,F'	1.7789

transmittance: 10 mm
τ_2.5	0.47
τ_2.3254	0.76
τ_1.9701	0.958
τ_1.5296	0.992
τ_1.06	0.996
τ_0.7	0.997
τ_0.66	0.997
τ_0.62	0.997
τ_0.58	0.996
τ_0.54607	0.996
τ_0.5	0.994
τ_0.46	0.988
τ_0.4358	0.982
τ_0.42	0.976
τ_0.4047	0.959
τ_0.4	0.95
τ_0.39	0.92
τ_0.38	0.88
τ_0.37	0.8
τ_0.365	0.75
τ_0.35	0.48

transmittance: 25 mm
τ_2.5	0.15
τ_2.3254	0.51
τ_1.9701	0.9
τ_1.5296	0.98
τ_1.06	0.991
τ_0.7	0.992
τ_0.66	0.992
τ_0.62	0.992
τ_0.58	0.991
τ_0.54607	0.99
τ_0.5	0.985
τ_0.46	0.971
τ_0.4358	0.956
τ_0.42	0.94
τ_0.4047	0.9
τ_0.4	0.88
τ_0.39	0.82
τ_0.38	0.73
τ_0.37	0.58
τ_0.365	0.48
τ_0.35	0.16

Density: 4.34 g/cm³
Poisson coef.: 0.294
Young module: 1260 Pa*10⁸
Knoop hardness: 780
Optical stress coef.: 1.42 1/Pa*10¹²
Abrasion: 2

Climatic resistance: 1
Staining: 1
Resistance to acids: 51.3
Resistance to alkalis: 1
Phosphate resistance: 1.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	62
20 ~ 300	72

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.4
20 ~ 40		2.2
60 ~ 80		2.7
-40 ~ -20	e	2.3
20 ~ 40	e	3.4
60 ~ 80	e	3.9
-40 ~ -20	g	3.3
20 ~ 40	g	4.5
60 ~ 80	g	5.2

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		3.7
20 ~ 40		3.8
60 ~ 80		3.9
-40 ~ -20	e	4.8
20 ~ 40	e	4.9
60 ~ 80	e	5.2
-40 ~ -20	g	5.8
20 ~ 40	g	6.1
60 ~ 80	g	6.4