N-BAK1 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.572500 n_e = 1.574871	V_d = 57.54 V_e = 57.26	n_F - n_C = 0.009947 n_F' - n_C' = 0.010038	Coloring: 0.33 - 0.27 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.12365662 C2 = 0.309276848 C3 = 0.881511957 C4 = 0.00644742752 C5 = 0.0222284402 C6 = 107.297751

Refraction index
n _2.3254	1.545564
n _1.9701	1.550322
n _1.5296	1.555427
n _1.06	1.560875
n _t	1.561515
n _s	1.564212
n _r	1.567779
n _C	1.569486
n _C'	1.569965
n _0.6328	1.570412
n _D	1.572411
n _d	1.572500
n _e	1.574871
n _F	1.579434
n _F'	1.580004
n _g	1.584878
n _h	1.589409
n _i	1.597156
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8013
P_C,A'	0.3433
P_d,C	0.3029
P_e,C	0.5413
P_g,d	1.2442
P_g,F	0.5471
P_h,g	0.4554
P_i,g	1.2342
P_C',t	0.8494
P_e,C'	0.4931
P_F',e	0.5159
P_i,F'	1.7241

transmittance: 10 mm
τ_2.5	0.81
τ_2.3254	0.88
τ_1.9701	0.96
τ_1.5296	0.994
τ_1.06	0.998
τ_0.7	0.999
τ_0.66	0.998
τ_0.62	0.998
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	0.996
τ_0.4047	0.996
τ_0.4	0.996
τ_0.39	0.995
τ_0.38	0.993
τ_0.37	0.991
τ_0.365	0.987
τ_0.35	0.971
τ_0.3341	0.92
τ_0.32	0.81
τ_0.31	0.68
τ_0.3	0.49
τ_0.29	0.28

transmittance: 25 mm
τ_2.5	0.58
τ_2.3254	0.72
τ_1.9701	0.9
τ_1.5296	0.986
τ_1.06	0.996
τ_0.7	0.997
τ_0.66	0.995
τ_0.62	0.995
τ_0.58	0.995
τ_0.54607	0.995
τ_0.5	0.992
τ_0.46	0.99
τ_0.4358	0.989
τ_0.42	0.99
τ_0.4047	0.99
τ_0.4	0.99
τ_0.39	0.988
τ_0.38	0.983
τ_0.37	0.977
τ_0.365	0.969
τ_0.35	0.93
τ_0.3341	0.82
τ_0.32	0.59
τ_0.31	0.38
τ_0.3	0.16
τ_0.29	0.04

Density: 3.19 g/cm³
Poisson coef.: 0.252
Young module: 730 Pa*10⁸
Knoop hardness: 530
Optical stress coef.: 2.62 1/Pa*10¹²

Climatic resistance: 2
Staining: 1
Resistance to acids: 3.3
Resistance to alkalis: 1.2
Phosphate resistance: 2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	76
20 ~ 300	86

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-0.6
20 ~ 40		0.2
60 ~ 80		0.7
-40 ~ -20	e	0.1
20 ~ 40	e	1
60 ~ 80	e	1.5
-40 ~ -20	g	0.7
20 ~ 40	g	1.7
60 ~ 80	g	2.3

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.5
20 ~ 40		1.5
60 ~ 80		1.7
-40 ~ -20	e	2.2
20 ~ 40	e	2.3
60 ~ 80	e	2.6
-40 ~ -20	g	2.8
20 ~ 40	g	3.1
60 ~ 80	g	3.4