N-BK10 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.497821 n_e = 1.499596	V_d = 66.95 V_e = 66.78	n_F - n_C = 0.007435 n_F' - n_C' = 0.007481	Coloring: 0.31 - 0.27 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 0.888308131 C2 = 0.328964475 C3 = 0.984610769 C4 = 0.00516900822 C5 = 0.0161190045 C6 = 99.7575331

Refraction index
n _2.3254	1.470603
n _1.9701	1.476472
n _1.5296	1.482522
n _1.06	1.488270
n _t	1.488874
n _s	1.491271
n _r	1.494186
n _C	1.495521
n _C'	1.495890
n _0.6328	1.496234
n _D	1.497754
n _d	1.497821
n _e	1.499596
n _F	1.502956
n _F'	1.503372
n _g	1.506899
n _h	1.510141
n _i	1.515613
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8939
P_C,A'	0.3637
P_d,C	0.3092
P_e,C	0.5480
P_g,d	1.2210
P_g,F	0.5303
P_h,g	0.4360
P_i,g	1.1720
P_C',t	0.9436
P_e,C'	0.4983
P_F',e	0.5078
P_i,F'	1.6464

transmittance: 10 mm
τ_2.5	0.74
τ_2.3254	0.87
τ_1.9701	0.98
τ_1.5296	0.992
τ_1.06	0.998
τ_0.7	0.998
τ_0.66	0.997
τ_0.62	0.997
τ_0.58	0.997
τ_0.54607	0.997
τ_0.5	0.996
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	0.996
τ_0.38	0.994
τ_0.37	0.994
τ_0.365	0.994
τ_0.35	0.991
τ_0.3341	0.978
τ_0.32	0.94
τ_0.31	0.87
τ_0.3	0.71
τ_0.29	0.41

transmittance: 25 mm
τ_2.5	0.47
τ_2.3254	0.71
τ_1.9701	0.95
τ_1.5296	0.98
τ_1.06	0.996
τ_0.7	0.995
τ_0.66	0.993
τ_0.62	0.992
τ_0.58	0.993
τ_0.54607	0.993
τ_0.5	0.991
τ_0.46	0.99
τ_0.4358	0.989
τ_0.42	0.989
τ_0.4047	0.99
τ_0.4	0.99
τ_0.39	0.989
τ_0.38	0.985
τ_0.37	0.986
τ_0.365	0.986
τ_0.35	0.978
τ_0.3341	0.95
τ_0.32	0.86
τ_0.31	0.71
τ_0.3	0.42
τ_0.29	0.11

Density: 2.39 g/cm³
Poisson coef.: 0.203
Young module: 710 Pa*10⁸
Knoop hardness: 560
Optical stress coef.: 3.21 1/Pa*10¹²
Abrasion: 4

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

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	58
20 ~ 300	66

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1
20 ~ 40		1.6
60 ~ 80		2.3
-40 ~ -20	e	1.3
20 ~ 40	e	2.1
60 ~ 80	e	2.9
-40 ~ -20	g	1.6
20 ~ 40	g	2.6
60 ~ 80	g	3.4

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		3
20 ~ 40		2.9
60 ~ 80		3.3
-40 ~ -20	e	3.4
20 ~ 40	e	3.5
60 ~ 80	e	4
-40 ~ -20	g	3.7
20 ~ 40	g	3.9
60 ~ 80	g	4.5