N-BAF4 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.605682 n_e = 1.608969	V_d = 43.72 V_e = 43.43	n_F - n_C = 0.013853 n_F' - n_C' = 0.014021	Coloring: 0.39 - 0.35 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.42056328 C2 = 0.102721269 C3 = 1.14380976 C4 = 0.00942015382 C5 = 0.0531087291 C6 = 110.278856

Refraction index
n _2.3254	1.570924
n _1.9701	1.576845
n _1.5296	1.583230
n _1.06	1.590162
n _t	1.590990
n _s	1.594516
n _r	1.599261
n _C	1.601565
n _C'	1.602215
n _0.6328	1.602824
n _D	1.605561
n _d	1.605682
n _e	1.608969
n _F	1.615419
n _F'	1.616236
n _g	1.623361
n _h	1.630215
n _i	1.642578
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7633
P_C,A'	0.3312
P_d,C	0.2971
P_e,C	0.5344
P_g,d	1.2761
P_g,F	0.5732
P_h,g	0.4947
P_i,g	1.3871
P_C',t	0.8102
P_e,C'	0.4875
P_F',e	0.5246
P_i,F'	1.9014

transmittance: 10 mm
τ_2.5	0.71
τ_2.3254	0.84
τ_1.9701	0.954
τ_1.5296	0.991
τ_1.06	0.998
τ_0.7	0.998
τ_0.66	0.996
τ_0.62	0.996
τ_0.58	0.997
τ_0.54607	0.997
τ_0.5	0.994
τ_0.46	0.988
τ_0.4358	0.983
τ_0.42	0.976
τ_0.4047	0.959
τ_0.4	0.95
τ_0.39	0.9
τ_0.38	0.8
τ_0.37	0.6
τ_0.365	0.44

transmittance: 25 mm
τ_2.5	0.42
τ_2.3254	0.64
τ_1.9701	0.89
τ_1.5296	0.977
τ_1.06	0.994
τ_0.7	0.994
τ_0.66	0.991
τ_0.62	0.99
τ_0.58	0.992
τ_0.54607	0.992
τ_0.5	0.985
τ_0.46	0.971
τ_0.4358	0.959
τ_0.42	0.94
τ_0.4047	0.9
τ_0.4	0.87
τ_0.39	0.77
τ_0.38	0.58
τ_0.37	0.28
τ_0.365	0.13

Density: 2.89 g/cm³
Poisson coef.: 0.231
Young module: 850 Pa*10⁸
Knoop hardness: 610
Optical stress coef.: 2.58 1/Pa*10¹²
Abrasion: 3

Climatic resistance: 1
Staining: 0
Resistance to acids: 1
Resistance to alkalis: 1.2
Phosphate resistance: 1.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	72
20 ~ 300	83

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0.1
20 ~ 40		0.9
60 ~ 80		1.3
-40 ~ -20	e	0.9
20 ~ 40	e	1.9
60 ~ 80	e	2.5
-40 ~ -20	g	1.9
20 ~ 40	g	3
60 ~ 80	g	3.8

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		2.2
20 ~ 40		2.2
60 ~ 80		2.4
-40 ~ -20	e	3.1
20 ~ 40	e	3.3
60 ~ 80	e	3.6
-40 ~ -20	g	4.1
20 ~ 40	g	4.5
60 ~ 80	g	4.9