N-SK2 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.607380 n_e = 1.609936	V_d = 56.65 V_e = 56.36	n_F - n_C = 0.010721 n_F' - n_C' = 0.010820	Coloring: 0.35 - 0.30 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.28189012 C2 = 0.257738258 C3 = 0.96818604 C4 = 0.0072719164 C5 = 0.0242823527 C6 = 110.377773

Refraction index
n _2.3254	1.578810
n _1.9701	1.583783
n _1.5296	1.589138
n _1.06	1.594902
n _t	1.595584
n _s	1.598468
n _r	1.602298
n _C	1.604135
n _C'	1.604650
n _0.6328	1.605132
n _D	1.607285
n _d	1.607380
n _e	1.609936
n _F	1.614857
n _F'	1.615471
n _g	1.620729
n _h	1.625619
n _i	1.633984
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7975
P_C,A'	0.3426
P_d,C	0.3027
P_e,C	0.5410
P_g,d	1.2450
P_g,F	0.5477
P_h,g	0.4560
P_i,g	1.2362
P_C',t	0.8455
P_e,C'	0.4930
P_F',e	0.5162
P_i,F'	1.7266

transmittance: 10 mm
τ_2.5	0.84
τ_2.3254	0.91
τ_1.9701	0.98
τ_1.5296	0.996
τ_1.06	0.998
τ_0.7	0.998
τ_0.66	0.998
τ_0.62	0.998
τ_0.58	0.998
τ_0.54607	0.998
τ_0.5	0.996
τ_0.46	0.994
τ_0.4358	0.994
τ_0.42	0.993
τ_0.4047	0.991
τ_0.4	0.99
τ_0.39	0.986
τ_0.38	0.98
τ_0.37	0.969
τ_0.365	0.963
τ_0.35	0.91
τ_0.3341	0.75
τ_0.32	0.5
τ_0.31	0.28

transmittance: 25 mm
τ_2.5	0.65
τ_2.3254	0.78
τ_1.9701	0.95
τ_1.5296	0.99
τ_1.06	0.995
τ_0.7	0.995
τ_0.66	0.994
τ_0.62	0.994
τ_0.58	0.995
τ_0.54607	0.995
τ_0.5	0.99
τ_0.46	0.986
τ_0.4358	0.985
τ_0.42	0.983
τ_0.4047	0.978
τ_0.4	0.975
τ_0.39	0.965
τ_0.38	0.95
τ_0.37	0.93
τ_0.365	0.91
τ_0.35	0.78
τ_0.3341	0.49
τ_0.32	0.18
τ_0.31	0.04

Density: 3.55 g/cm³
Poisson coef.: 0.263
Young module: 780 Pa*10⁸
Knoop hardness: 550
Optical stress coef.: 2.31 1/Pa*10¹²
Abrasion: 2

Climatic resistance: 2
Staining: 0
Resistance to acids: 2.2
Resistance to alkalis: 1
Phosphate resistance: 2.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	60
20 ~ 300	71

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.5
20 ~ 40		2.3
60 ~ 80		2.9
-40 ~ -20	e	2.4
20 ~ 40	e	3.1
60 ~ 80	e	3.8
-40 ~ -20	g	3.1
20 ~ 40	g	3.9
60 ~ 80	g	4.5

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		3.7
20 ~ 40		3.6
60 ~ 80		4
-40 ~ -20	e	4.6
20 ~ 40	e	4.5
60 ~ 80	e	4.9
-40 ~ -20	g	5.3
20 ~ 40	g	5.3
60 ~ 80	g	5.7