N-SK4 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.612717 n_e = 1.615209	V_d = 58.63 V_e = 58.36	n_F - n_C = 0.010449 n_F' - n_C' = 0.010540	Coloring: 0.36 - 0.32 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.32993741 C2 = 0.228542996 C3 = 0.988465211 C4 = 0.00716874107 C5 = 0.0246455892 C6 = 100.886364

Refraction index
n _2.3254	1.582817
n _1.9701	1.588348
n _1.5296	1.594218
n _1.06	1.600316
n _t	1.601016
n _s	1.603934
n _r	1.607735
n _C	1.609541
n _C'	1.610047
n _0.6328	1.610519
n _D	1.612624
n _d	1.612717
n _e	1.615209
n _F	1.619991
n _F'	1.620587
n _g	1.625684
n _h	1.630415
n _i	1.638496
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8158
P_C,A'	0.3465
P_d,C	0.3038
P_e,C	0.5423
P_g,d	1.2408
P_g,F	0.5447
P_h,g	0.4527
P_i,g	1.2260
P_C',t	0.8642
P_e,C'	0.4939
P_F',e	0.5147
P_i,F'	1.7137

transmittance: 10 mm
τ_2.5	0.69
τ_2.3254	0.83
τ_1.9701	0.959
τ_1.5296	0.991
τ_1.06	0.997
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	0.997
τ_0.46	0.994
τ_0.4358	0.993
τ_0.42	0.993
τ_0.4047	0.992
τ_0.4	0.99
τ_0.39	0.984
τ_0.38	0.971
τ_0.37	0.95
τ_0.365	0.93
τ_0.35	0.82
τ_0.3341	0.53

transmittance: 25 mm
τ_2.5	0.39
τ_2.3254	0.62
τ_1.9701	0.9
τ_1.5296	0.977
τ_1.06	0.993
τ_0.7	0.996
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	0.985
τ_0.4358	0.983
τ_0.42	0.983
τ_0.4047	0.979
τ_0.4	0.975
τ_0.39	0.96
τ_0.38	0.93
τ_0.37	0.87
τ_0.365	0.83
τ_0.35	0.61
τ_0.3341	0.2

Density: 3.54 g/cm³
Poisson coef.: 0.261
Young module: 840 Pa*10⁸
Knoop hardness: 580
Optical stress coef.: 1.92 1/Pa*10¹²
Abrasion: 3

Climatic resistance: 3
Staining: 1
Resistance to acids: 51.2
Resistance to alkalis: 2
Phosphate resistance: 2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	65
20 ~ 300	74

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-0.1
20 ~ 40		0.7
60 ~ 80		1.2
-40 ~ -20	e	0.4
20 ~ 40	e	1.4
60 ~ 80	e	1.9
-40 ~ -20	g	0.9
20 ~ 40	g	2
60 ~ 80	g	2.6

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		2
20 ~ 40		2.1
60 ~ 80		2.3
-40 ~ -20	e	2.6
20 ~ 40	e	2.8
60 ~ 80	e	3
-40 ~ -20	g	3.1
20 ~ 40	g	3.4
60 ~ 80	g	3.7