N-LASF31 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.880669 n_e = 1.885773	V_d = 41.00 V_e = 40.76	n_F - n_C = 0.021474 n_F' - n_C' = 0.021731	Coloring: 0.46 - 0.32 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.71317198 C2 = 0.718575109 C3 = 1.7233247 C4 = 0.00819172228 C5 = 0.0297801704 C6 = 138.461313

Refraction index
n _2.3254	1.835289
n _1.9701	1.841528
n _1.5296	1.848623
n _1.06	1.857362
n _t	1.858506
n _s	1.863583
n _r	1.870744
n _C	1.874289
n _C'	1.875293
n _0.6328	1.876235
n _D	1.880479
n _d	1.880669
n _e	1.885773
n _F	1.895764
n _F'	1.897024
n _g	1.907928
n _h	1.918244
n _i	1.936275
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7349
P_C,A'	0.3271
P_d,C	0.2970
P_e,C	0.5347
P_g,d	1.2694
P_g,F	0.5664
P_h,g	0.4803
P_i,g	1.3200
P_C',t	0.7816
P_e,C'	0.4880
P_F',e	0.5239
P_i,F'	1.8277

transmittance: 10 mm
τ_2.5	0.78
τ_2.3254	0.92
τ_1.9701	0.984
τ_1.5296	0.997
τ_1.06	0.997
τ_0.7	0.998
τ_0.66	0.998
τ_0.62	0.997
τ_0.58	0.997
τ_0.54607	0.996
τ_0.5	0.987
τ_0.46	0.971
τ_0.4358	0.959
τ_0.42	0.95
τ_0.4047	0.92
τ_0.4	0.91
τ_0.39	0.89
τ_0.38	0.84
τ_0.37	0.78
τ_0.365	0.73
τ_0.35	0.54
τ_0.3341	0.28

transmittance: 25 mm
τ_2.5	0.54
τ_2.3254	0.81
τ_1.9701	0.96
τ_1.5296	0.992
τ_1.06	0.993
τ_0.7	0.994
τ_0.66	0.994
τ_0.62	0.993
τ_0.58	0.993
τ_0.54607	0.99
τ_0.5	0.968
τ_0.46	0.93
τ_0.4358	0.9
τ_0.42	0.87
τ_0.4047	0.82
τ_0.4	0.8
τ_0.39	0.74
τ_0.38	0.65
τ_0.37	0.53
τ_0.365	0.46
τ_0.35	0.21
τ_0.3341	0.04

Density: 5.41 g/cm³
Poisson coef.: 0.299
Young module: 1240 Pa*10⁸
Knoop hardness: 770
Optical stress coef.: 1.1 1/Pa*10¹²
Abrasion: 2

Climatic resistance: 1
Staining: 0
Resistance to acids: 2
Resistance to alkalis: 1
Phosphate resistance: 1

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	68
20 ~ 300	77

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.2
20 ~ 40		2
60 ~ 80		2.5
-40 ~ -20	e	2.5
20 ~ 40	e	3.5
60 ~ 80	e	4.1
-40 ~ -20	g	3.8
20 ~ 40	g	5.1
60 ~ 80	g	5.9

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		3.7
20 ~ 40		3.6
60 ~ 80		3.7
-40 ~ -20	e	5
20 ~ 40	e	5.2
60 ~ 80	e	5.4
-40 ~ -20	g	6.5
20 ~ 40	g	6.8
60 ~ 80	g	7.2