N-BAK2 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.539960 n_e = 1.542116	V_d = 59.70 V_e = 59.43	n_F - n_C = 0.009043 n_F' - n_C' = 0.009120	Coloring: 0.31 - 0.26 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.01662154 C2 = 0.319903051 C3 = 0.937232995 C4 = 0.00592383763 C5 = 0.0203828415 C6 = 113.118417

Refraction index
n _2.3254	1.513868
n _1.9701	1.518705
n _1.5296	1.523851
n _1.06	1.529189
n _t	1.529800
n _s	1.532341
n _r	1.535642
n _C	1.537209
n _C'	1.537647
n _0.6328	1.538056
n _D	1.539879
n _d	1.539960
n _e	1.542116
n _F	1.546252
n _F'	1.546767
n _g	1.551169
n _h	1.555251
n _i	1.562210
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8192
P_C,A'	0.3473
P_d,C	0.3041
P_e,C	0.5426
P_g,d	1.2395
P_g,F	0.5437
P_h,g	0.4513
P_i,g	1.2209
P_C',t	0.8676
P_e,C'	0.4942
P_F',e	0.5143
P_i,F'	1.7076

transmittance: 10 mm
τ_2.5	0.74
τ_2.3254	0.82
τ_1.9701	0.93
τ_1.5296	0.994
τ_1.06	0.999
τ_0.7	0.998
τ_0.66	0.998
τ_0.62	0.997
τ_0.58	0.998
τ_0.54607	0.998
τ_0.5	0.997
τ_0.46	0.996
τ_0.4358	0.996
τ_0.42	0.997
τ_0.4047	0.997
τ_0.4	0.997
τ_0.39	0.996
τ_0.38	0.996
τ_0.37	0.996
τ_0.365	0.994
τ_0.35	0.988
τ_0.3341	0.968
τ_0.32	0.92
τ_0.31	0.84
τ_0.3	0.7
τ_0.29	0.52
τ_0.28	0.3

transmittance: 25 mm
τ_2.5	0.47
τ_2.3254	0.6
τ_1.9701	0.84
τ_1.5296	0.984
τ_1.06	0.997
τ_0.7	0.995
τ_0.66	0.994
τ_0.62	0.993
τ_0.58	0.994
τ_0.54607	0.994
τ_0.5	0.993
τ_0.46	0.991
τ_0.4358	0.991
τ_0.42	0.992
τ_0.4047	0.992
τ_0.4	0.992
τ_0.39	0.991
τ_0.38	0.989
τ_0.37	0.989
τ_0.365	0.986
τ_0.35	0.971
τ_0.3341	0.92
τ_0.32	0.8
τ_0.31	0.65
τ_0.3	0.41
τ_0.29	0.19
τ_0.28	0.05

Density: 2.86 g/cm³
Poisson coef.: 0.233
Young module: 710 Pa*10⁸
Knoop hardness: 530
Optical stress coef.: 2.6 1/Pa*10¹²
Abrasion: 2

Climatic resistance: 2
Staining: 0
Resistance to acids: 1
Resistance to alkalis: 1
Phosphate resistance: 2.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	80
20 ~ 300	90

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-0.9
20 ~ 40		-0.3
60 ~ 80		0.1
-40 ~ -20	e	-0.3
20 ~ 40	e	0.3
60 ~ 80	e	0.8
-40 ~ -20	g	0.2
20 ~ 40	g	0.9
60 ~ 80	g	1.4

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.1
20 ~ 40		1
60 ~ 80		1.1
-40 ~ -20	e	1.8
20 ~ 40	e	1.7
60 ~ 80	e	1.8
-40 ~ -20	g	2.3
20 ~ 40	g	2.3
60 ~ 80	g	2.4