LaK L12 - Schott 2000

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.677900 n_e = 1.680842	V_d = 54.92 V_e = 54.68	n_F - n_C = 0.012342 n_F' - n_C' = 0.012449	Coloring: 0.37 - 0.31 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.3254 mkm.
C1 = 1.28115389 C2 = 0.482607607 C3 = 1.16553538 C4 = 0.00636439821 C5 = 0.0213764262 C6 = 93.2771532

Refraction index
n _2.3254	1.641785
n _1.9701	1.648615
n _1.5296	1.655813
n _1.06	1.663192
n _t	1.664030
n _s	1.667508
n _r	1.672013
n _C	1.674148
n _C'	1.674746
n _0.6328	1.675303
n _D	1.677790
n _d	1.677900
n _e	1.680842
n _F	1.686491
n _F'	1.687195
n _g	1.693220
n _h	1.698817
n _i	1.708387
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8197
P_C,A'	0.3471
P_d,C	0.3039
P_e,C	0.5423
P_g,d	1.2412
P_g,F	0.5451
P_h,g	0.4535
P_i,g	1.2289
P_C',t	0.8681
P_e,C'	0.4939
P_F',e	0.5147
P_i,F'	1.7170

transmittance: 10 mm
τ_2.3254	0.73
τ_1.9701	0.94
τ_1.5296	0.98
τ_1.06	0.991
τ_0.7	0.995
τ_0.66	0.995
τ_0.62	0.995
τ_0.58	0.995
τ_0.54607	0.995
τ_0.5	0.993
τ_0.46	0.989
τ_0.4358	0.985
τ_0.42	0.983
τ_0.4047	0.98
τ_0.4	0.98
τ_0.39	0.971
τ_0.38	0.954
τ_0.37	0.92
τ_0.365	0.9
τ_0.35	0.77
τ_0.3341	0.56
τ_0.32	0.32

transmittance: 25 mm
τ_2.3254	0.46
τ_1.9701	0.86
τ_1.5296	0.95
τ_1.06	0.978
τ_0.7	0.988
τ_0.66	0.988
τ_0.62	0.988
τ_0.58	0.988
τ_0.54607	0.987
τ_0.5	0.983
τ_0.46	0.972
τ_0.4358	0.963
τ_0.42	0.958
τ_0.4047	0.951
τ_0.4	0.95
τ_0.39	0.93
τ_0.38	0.89
τ_0.37	0.82
τ_0.365	0.77
τ_0.35	0.52
τ_0.3341	0.23
τ_0.32	0.06

Density: 3.32 g/cm³
Poisson coef.: 0.281
Young module: 1100 Pa*10⁸
Knoop hardness: 700
Optical stress coef.: 1.84 1/Pa*10¹²

Climatic resistance: 3
Staining: 3
Resistance to acids: 53.3
Resistance to alkalis: 2.2
Phosphate resistance: 3.3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	68
20 ~ 300	80

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0.8
20 ~ 40		1.5
60 ~ 80		2
-40 ~ -20	e	1.5
20 ~ 40	e	2.3
60 ~ 80	e	2.9
-40 ~ -20	g	2.1
20 ~ 40	g	3.1
60 ~ 80	g	3.7

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		3
20 ~ 40		3
60 ~ 80		3.1
-40 ~ -20	e	3.8
20 ~ 40	e	3.8
60 ~ 80	e	4
-40 ~ -20	g	4.5
20 ~ 40	g	4.6
60 ~ 80	g	4.9