K7 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.511120 n_e = 1.513138	V_d = 60.40 V_e = 60.15	n_F - n_C = 0.008461 n_F' - n_C' = 0.008530	Coloring: 0.33 - 0.30 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.1273555 C2 = 0.124412303 C3 = 0.827100531 C4 = 0.00720341707 C5 = 0.0269835916 C6 = 100.384588

Refraction index
n _2.3254	1.485531
n _1.9701	1.490459
n _1.5296	1.495648
n _1.06	1.500913
n _t	1.501504
n _s	1.503941
n _r	1.507067
n _C	1.508540
n _C'	1.508952
n _0.6328	1.509336
n _D	1.511045
n _d	1.511120
n _e	1.513138
n _F	1.517002
n _F'	1.517483
n _g	1.521590
n _h	1.525398
n _i	1.531893
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8315
P_C,A'	0.3499
P_d,C	0.3049
P_e,C	0.5433
P_g,d	1.2372
P_g,F	0.5422
P_h,g	0.4500
P_i,g	1.2177
P_C',t	0.8801
P_e,C'	0.4947
P_F',e	0.5134
P_i,F'	1.7031

transmittance: 10 mm
τ_2.3254	0.76
τ_1.9701	0.91
τ_1.5296	0.992
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	0.997
τ_0.46	0.996
τ_0.4358	0.996
τ_0.42	0.996
τ_0.4047	0.996
τ_0.4	0.994
τ_0.39	0.993
τ_0.38	0.991
τ_0.37	0.99
τ_0.365	0.988
τ_0.35	0.976
τ_0.3341	0.91
τ_0.32	0.71
τ_0.31	0.4

transmittance: 25 mm
τ_2.3254	0.5
τ_1.9701	0.79
τ_1.5296	0.98
τ_1.06	0.994
τ_0.7	0.996
τ_0.66	0.995
τ_0.62	0.995
τ_0.58	0.994
τ_0.54607	0.994
τ_0.5	0.993
τ_0.46	0.99
τ_0.4358	0.99
τ_0.42	0.99
τ_0.4047	0.99
τ_0.4	0.985
τ_0.39	0.983
τ_0.38	0.978
τ_0.37	0.974
τ_0.365	0.971
τ_0.35	0.94
τ_0.3341	0.78
τ_0.32	0.42
τ_0.31	0.1

Density: 2.53 g/cm³
Poisson coef.: 0.214
Young module: 690 Pa*10⁸
Knoop hardness: 520
Optical stress coef.: 2.95 1/Pa*10¹²

Climatic resistance: 3
Staining: 0
Resistance to acids: 2
Resistance to alkalis: 1
Phosphate resistance: 2.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	84
20 ~ 300	97

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-1
20 ~ 40		-0.4
60 ~ 80		-0.2
-40 ~ -20	e	-0.4
20 ~ 40	e	0.2
60 ~ 80	e	0.6
-40 ~ -20	g	0.1
20 ~ 40	g	0.9
60 ~ 80	g	1.2

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1
20 ~ 40		0.9
60 ~ 80		0.8
-40 ~ -20	e	1.6
20 ~ 40	e	1.6
60 ~ 80	e	1.6
-40 ~ -20	g	2.1
20 ~ 40	g	2.2
60 ~ 80	g	2.3