N-LLF6 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.531687 n_e = 1.534272	V_d = 48.89 V_e = 48.61	n_F - n_C = 0.010874 n_F' - n_C' = 0.010990	Coloring: 0.37 - 0.34 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.22932376 C2 = 0.0755174062 C3 = 0.988839837 C4 = 0.00877776451 C5 = 0.0480429329 C6 = 112.136098

Refraction index
n _2.3254	1.502470
n _1.9701	1.507687
n _1.5296	1.513268
n _1.06	1.519172
n _t	1.519861
n _s	1.522757
n _r	1.526586
n _C	1.528425
n _C'	1.528942
n _0.6328	1.529426
n _D	1.531591
n _d	1.531687
n _e	1.534272
n _F	1.539299
n _F'	1.539932
n _g	1.545409
n _h	1.550607
n _i	1.559792
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7876
P_C,A'	0.3379
P_d,C	0.2999
P_e,C	0.5376
P_g,d	1.2618
P_g,F	0.5618
P_h,g	0.4780
P_i,g	1.3227
P_C',t	0.8351
P_e,C'	0.4901
P_F',e	0.5205
P_i,F'	1.8263

transmittance: 10 mm
τ_2.5	0.69
τ_2.3254	0.77
τ_1.9701	0.91
τ_1.5296	0.992
τ_1.06	0.996
τ_0.7	0.997
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	0.994
τ_0.4358	0.992
τ_0.42	0.991
τ_0.4047	0.986
τ_0.4	0.982
τ_0.39	0.967
τ_0.38	0.94
τ_0.37	0.87
τ_0.365	0.81
τ_0.35	0.38

transmittance: 25 mm
τ_2.5	0.4
τ_2.3254	0.52
τ_1.9701	0.8
τ_1.5296	0.98
τ_1.06	0.991
τ_0.7	0.992
τ_0.66	0.99
τ_0.62	0.99
τ_0.58	0.991
τ_0.54607	0.991
τ_0.5	0.988
τ_0.46	0.984
τ_0.4358	0.981
τ_0.42	0.977
τ_0.4047	0.965
τ_0.4	0.955
τ_0.39	0.92
τ_0.38	0.85
τ_0.37	0.71
τ_0.365	0.59
τ_0.35	0.09

Density: 2.5 g/cm³
Poisson coef.: 0.211
Young module: 720 Pa*10⁸
Knoop hardness: 520
Optical stress coef.: 2.93 1/Pa*10¹²
Abrasion: 2

Climatic resistance: 1
Staining: 0
Resistance to acids: 1
Resistance to alkalis: 1
Phosphate resistance: 1

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	77
20 ~ 300	87

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0.7
20 ~ 40		1.4
60 ~ 80		1.8
-40 ~ -20	e	1.4
20 ~ 40	e	2.3
60 ~ 80	e	2.7
-40 ~ -20	g	2.2
20 ~ 40	g	3.2
60 ~ 80	g	3.7

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		2.7
20 ~ 40		2.7
60 ~ 80		2.8
-40 ~ -20	e	3.5
20 ~ 40	e	3.6
60 ~ 80	e	3.8
-40 ~ -20	g	4.4
20 ~ 40	g	4.6
60 ~ 80	g	4.8