N-FK51 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.486561 n_e = 1.487936	V_d = 84.46 V_e = 84.07	n_F - n_C = 0.005760 n_F' - n_C' = 0.005803	Coloring: 0.34 - 0.28 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 0.971247817 C2 = 0.216901417 C3 = 0.904651666 C4 = 0.00472301995 C5 = 0.0153575612 C6 = 168.68133

Refraction index
n _2.3254	1.469576
n _1.9701	1.472714
n _1.5296	1.476083
n _1.06	1.479590
n _t	1.479990
n _s	1.481649
n _r	1.483787
n _C	1.484797
n _C'	1.485078
n _0.6328	1.485341
n _D	1.486509
n _d	1.486561
n _e	1.487936
n _F	1.490557
n _F'	1.490882
n _g	1.493644
n _h	1.496183
n _i	1.500462
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8344
P_C,A'	0.3520
P_d,C	0.3062
P_e,C	0.5450
P_g,d	1.2296
P_g,F	0.5359
P_h,g	0.4407
P_i,g	1.1836
P_C',t	0.8832
P_e,C'	0.4961
P_F',e	0.5113
P_i,F'	1.6631

transmittance: 10 mm
τ_2.5	0.89
τ_2.3254	0.93
τ_1.9701	0.976
τ_1.5296	0.992
τ_1.06	0.998
τ_0.7	0.996
τ_0.66	0.996
τ_0.62	0.996
τ_0.58	0.997
τ_0.54607	0.998
τ_0.5	0.997
τ_0.46	0.995
τ_0.4358	0.994
τ_0.42	0.994
τ_0.4047	0.995
τ_0.4	0.995
τ_0.39	0.994
τ_0.38	0.992
τ_0.37	0.985
τ_0.365	0.981
τ_0.35	0.95
τ_0.3341	0.83
τ_0.32	0.62
τ_0.31	0.43
τ_0.3	0.26
τ_0.29	0.16

transmittance: 25 mm
τ_2.5	0.75
τ_2.3254	0.84
τ_1.9701	0.94
τ_1.5296	0.98
τ_1.06	0.995
τ_0.7	0.991
τ_0.66	0.99
τ_0.62	0.991
τ_0.58	0.993
τ_0.54607	0.994
τ_0.5	0.992
τ_0.46	0.987
τ_0.4358	0.985
τ_0.42	0.985
τ_0.4047	0.987
τ_0.4	0.987
τ_0.39	0.986
τ_0.38	0.979
τ_0.37	0.964
τ_0.365	0.953
τ_0.35	0.88
τ_0.3341	0.63
τ_0.32	0.3
τ_0.31	0.12
τ_0.3	0.04
τ_0.29	0.01

Density: 3.73 g/cm³
Poisson coef.: 0.293
Young module: 810 Pa*10⁸
Knoop hardness: 430
Optical stress coef.: 0.7 1/Pa*10¹²
Abrasion: 5

Climatic resistance: 2
Staining: 0
Resistance to acids: 52.3
Resistance to alkalis: 2.2
Phosphate resistance: 4.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	133
20 ~ 300	153

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-6.9
20 ~ 40		-7.3
60 ~ 80		-7.5
-40 ~ -20	e	-6.6
20 ~ 40	e	-7
60 ~ 80	e	-7.2
-40 ~ -20	g	-6.4
20 ~ 40	g	-6.7
60 ~ 80	g	-6.9

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-4.9
20 ~ 40		-6
60 ~ 80		-6.5
-40 ~ -20	e	-4.6
20 ~ 40	e	-5.7
60 ~ 80	e	-6.2
-40 ~ -20	g	-4.3
20 ~ 40	g	-5.3
60 ~ 80	g	-5.8