LAH78 - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.901354 n_e = 1.908109	V_d = 31.55 V_e = 31.31	n_F - n_C = 0.028568 n_F' - n_C' = 0.028998	Coloring: 0.36 - 0.40 mkm.

Type: Sellmeier
Spectral range: 0.4046561 - 2.325 mkm.
C1 = 2.08122726 C2 = 0.398632407 C3 = 2.21679491 C4 = 0.011190641 C5 = 0.0521753272 C6 = 141.893166

Refraction index
n _2.3254	-----
n _1.9701	1.851746
n _1.5296	1.860588
n _1.06	1.871500
n _t	1.872936
n _s	1.879334
n _r	1.888462
n _C	1.893033
n _C'	1.894334
n _0.6328	1.895558
n _D	1.901105
n _d	1.901354
n _e	1.908109
n _F	1.921602
n _F'	1.923333
n _g	1.938591
n _h	1.953556
n _i	-----
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7034
P_C,A'	0.3158
P_d,C	0.2912
P_e,C	0.5276
P_g,d	1.3034
P_g,F	0.5946
P_h,g	0.5238
P_i,g	-----
P_C',t	0.7489
P_e,C'	0.4821
P_F',e	0.5328
P_i,F'	-----

transmittance: 10 mm
τ_0.36	0.01
τ_0.37	0.25
τ_0.38	0.58
τ_0.39	0.76
τ_0.4	0.85
τ_0.42	0.927
τ_0.44	0.955
τ_0.46	0.967
τ_0.48	0.976
τ_0.5	0.983
τ_0.55	0.992
τ_0.6	0.996
τ_0.65	0.997
τ_0.7	0.997
τ_0.8	0.998
τ_0.9	0.998
τ₁	0.998
τ_1.2	0.999
τ_1.4	0.997
τ_1.6	0.997
τ_1.8	0.992
τ₂	0.976
τ_2.2	0.935
τ_2.4	0.78

Poisson coef.: 0.294
Rigidity: 476 Pa*10⁸
Young module: 1232 Pa*10⁸
Knoop hardness: 680
Abrasion: 63

Climatic resistance: 2
Resistance to acids: 3
Phosphate resistance: 1

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	60
100 ~ 300	74

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	t	4.6
-20 ~ 0	t	4.8
0 ~ 20	t	4.9
20 ~ 40	t	5
40 ~ 60	t	5.2
60 ~ 80	t	5.3
-40 ~ -20	C'	5.5
-20 ~ 0	C'	5.7
0 ~ 20	C'	5.9
20 ~ 40	C'	6.1
40 ~ 60	C'	6.2
60 ~ 80	C'	6.4
-40 ~ -20		5.6
-20 ~ 0		5.8
0 ~ 20		6
20 ~ 40		6.1
40 ~ 60		6.3
60 ~ 80		6.5
-40 ~ -20	D	5.9
-20 ~ 0	D	6.1
0 ~ 20	D	6.3
20 ~ 40	D	6.5
40 ~ 60	D	6.7
60 ~ 80	D	6.9
-40 ~ -20	e	6.4
-20 ~ 0	e	6.6
0 ~ 20	e	6.8
20 ~ 40	e	7.1
40 ~ 60	e	7.3
60 ~ 80	e	7.5
-40 ~ -20	F	7.5
-20 ~ 0	F	7.8
0 ~ 20	F	8.1
20 ~ 40	F	8.4
40 ~ 60	F	8.7
60 ~ 80	F	9
-40 ~ -20	g	8.7
-20 ~ 0	g	9.1
0 ~ 20	g	9.5
20 ~ 40	g	9.8
40 ~ 60	g	10.2
60 ~ 80	g	10.6