LAFN7 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.749501 n_e = 1.754582	V_d = 34.95 V_e = 34.71	n_F - n_C = 0.021444 n_F' - n_C' = 0.021735	Coloring: 0.40 - 0.35 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.66842615 C2 = 0.298512803 C3 = 1.0774376 C4 = 0.0103159999 C5 = 0.0469216348 C6 = 82.5078509

Refraction index
n _2.3254	1.702108
n _1.9701	1.709342
n _1.5296	1.717263
n _1.06	1.726422
n _t	1.727578
n _s	1.732640
n _r	1.739701
n _C	1.743194
n _C'	1.744184
n _0.6328	1.745114
n _D	1.749314
n _d	1.749501
n _e	1.754582
n _F	1.764638
n _F'	1.765919
n _g	1.777131
n _h	1.787979
n _i	1.807621
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7281
P_C,A'	0.3226
P_d,C	0.2941
P_e,C	0.5310
P_g,d	1.2883
P_g,F	0.5825
P_h,g	0.5058
P_i,g	1.4218
P_C',t	0.7743
P_e,C'	0.4848
P_F',e	0.5286
P_i,F'	1.9446

transmittance: 10 mm
τ_2.5	0.38
τ_2.3254	0.7
τ_1.9701	0.94
τ_1.5296	0.984
τ_1.06	0.998
τ_0.7	0.998
τ_0.66	0.998
τ_0.62	0.998
τ_0.58	0.998
τ_0.54607	0.998
τ_0.5	0.998
τ_0.46	0.993
τ_0.4358	0.986
τ_0.42	0.976
τ_0.4047	0.95
τ_0.4	0.94
τ_0.39	0.91
τ_0.38	0.84
τ_0.37	0.69
τ_0.365	0.55
τ_0.35	0.16

transmittance: 25 mm
τ_2.5	0.09
τ_2.3254	0.41
τ_1.9701	0.85
τ_1.5296	0.96
τ_1.06	0.996
τ_0.7	0.996
τ_0.66	0.995
τ_0.62	0.995
τ_0.58	0.995
τ_0.54607	0.994
τ_0.5	0.994
τ_0.46	0.982
τ_0.4358	0.965
τ_0.42	0.94
τ_0.4047	0.88
τ_0.4	0.85
τ_0.39	0.78
τ_0.38	0.65
τ_0.37	0.4
τ_0.365	0.22
τ_0.35	0.01

Density: 4.38 g/cm³
Poisson coef.: 0.28
Young module: 800 Pa*10⁸
Knoop hardness: 520
Optical stress coef.: 1.77 1/Pa*10¹²
Abrasion: 3

Climatic resistance: 3
Staining: 1
Resistance to acids: 53.3
Resistance to alkalis: 2.2
Phosphate resistance: 4.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	53
20 ~ 300	64

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		3.7
20 ~ 40		4.8
60 ~ 80		5.3
-40 ~ -20	e	5.4
20 ~ 40	e	6.7
60 ~ 80	e	7.4
-40 ~ -20	g	7.2
20 ~ 40	g	8.9
60 ~ 80	g	9.7

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		6
20 ~ 40		6.3
60 ~ 80		6.5
-40 ~ -20	e	7.8
20 ~ 40	e	8.3
60 ~ 80	e	8.6
-40 ~ -20	g	9.7
20 ~ 40	g	10.4
60 ~ 80	g	10.9