N-KF9 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.523459 n_e = 1.525875	V_d = 51.54 V_e = 51.26	n_F - n_C = 0.010156 n_F' - n_C' = 0.010258	Coloring: 0.37 - 0.34 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.19286778 C2 = 0.0893346571 C3 = 0.920819805 C4 = 0.00839154696 C5 = 0.0404010786 C6 = 112.572446

Refraction index
n _2.3254	1.496083
n _1.9701	1.500947
n _1.5296	1.506161
n _1.06	1.511696
n _t	1.512344
n _s	1.515069
n _r	1.518671
n _C	1.520400
n _C'	1.520885
n _0.6328	1.521339
n _D	1.523369
n _d	1.523459
n _e	1.525875
n _F	1.530556
n _F'	1.531143
n _g	1.536200
n _h	1.540959
n _i	1.549247
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7932
P_C,A'	0.3401
P_d,C	0.3011
P_e,C	0.5391
P_g,d	1.2545
P_g,F	0.5557
P_h,g	0.4685
P_i,g	1.2846
P_C',t	0.8409
P_e,C'	0.4913
P_F',e	0.5186
P_i,F'	1.7825

transmittance: 10 mm
τ_2.5	0.62
τ_2.3254	0.71
τ_1.9701	0.89
τ_1.5296	0.992
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	0.998
τ_0.46	0.996
τ_0.4358	0.995
τ_0.42	0.994
τ_0.4047	0.99
τ_0.4	0.986
τ_0.39	0.976
τ_0.38	0.95
τ_0.37	0.9
τ_0.365	0.86
τ_0.35	0.54

transmittance: 25 mm
τ_2.5	0.3
τ_2.3254	0.43
τ_1.9701	0.74
τ_1.5296	0.981
τ_1.06	0.995
τ_0.7	0.997
τ_0.66	0.995
τ_0.62	0.994
τ_0.58	0.996
τ_0.54607	0.996
τ_0.5	0.994
τ_0.46	0.99
τ_0.4358	0.988
τ_0.42	0.985
τ_0.4047	0.975
τ_0.4	0.965
τ_0.39	0.94
τ_0.38	0.88
τ_0.37	0.77
τ_0.365	0.68
τ_0.35	0.21

Density: 2.5 g/cm³
Poisson coef.: 0.225
Young module: 660 Pa*10⁸
Knoop hardness: 480
Optical stress coef.: 2.74 1/Pa*10¹²
Abrasion: 1

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	96
20 ~ 300	110

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-0.9
20 ~ 40		-0.4
60 ~ 80		-0.1
-40 ~ -20	e	-0.2
20 ~ 40	e	0.4
60 ~ 80	e	0.8
-40 ~ -20	g	0.5
20 ~ 40	g	1.3
60 ~ 80	g	1.7

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.1
20 ~ 40		0.9
60 ~ 80		0.9
-40 ~ -20	e	1.9
20 ~ 40	e	1.8
60 ~ 80	e	1.8
-40 ~ -20	g	2.6
20 ~ 40	g	2.6
60 ~ 80	g	2.8