LAM 7 - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.749496 n_e = 1.754527	V_d = 35.27 V_e = 35.01	n_F - n_C = 0.021245 n_F' - n_C' = 0.021551	Coloring: 0.35 - 0.40 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.325 mkm.
C1 = 1.7341919 C2 = 0.231489594 C3 = 1.51709567 C4 = 0.0111075471 C5 = 0.0515327669 C6 = 163.413427

Refraction index
n _2.3254	-----
n _1.9701	1.713728
n _1.5296	1.719630
n _1.06	1.727315
n _t	1.728360
n _s	1.733071
n _r	1.739870
n _C	1.743285
n _C'	1.744257
n _0.6328	1.745171
n _D	1.749311
n _d	1.749496
n _e	1.754527
n _F	1.764530
n _F'	1.765808
n _g	1.777021
n _h	1.787922
n _i	1.807809
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7024
P_C,A'	0.3170
P_d,C	0.2923
P_e,C	0.5291
P_g,d	1.2955
P_g,F	0.5879
P_h,g	0.5130
P_i,g	1.4491
P_C',t	0.7482
P_e,C'	0.4834
P_F',e	0.5309
P_i,F'	1.9769

transmittance: 10 mm
τ_0.35	0.13
τ_0.36	0.44
τ_0.37	0.69
τ_0.38	0.82
τ_0.39	0.89
τ_0.4	0.931
τ_0.42	0.964
τ_0.44	0.977
τ_0.46	0.985
τ_0.48	0.99
τ_0.5	0.994
τ_0.55	0.998
τ_0.6	0.998
τ_0.65	0.998
τ_0.7	0.998
τ_0.8	0.998
τ_0.9	0.998
τ₁	0.997
τ_1.2	0.996
τ_1.4	0.994
τ_1.6	0.993
τ_1.8	0.988
τ₂	0.98
τ_2.2	0.962
τ_2.4	0.931

Poisson coef.: 0.266
Rigidity: 311 Pa*10⁸
Young module: 788 Pa*10⁸
Knoop hardness: 470
Abrasion: 223

Climatic resistance: 1
Resistance to acids: 5.2
Phosphate resistance: 3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	84
100 ~ 300	94

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	t	2.2
-20 ~ 0	t	2.2
0 ~ 20	t	2.3
20 ~ 40	t	2.3
40 ~ 60	t	2.4
60 ~ 80	t	2.5
-40 ~ -20	C'	3.5
-20 ~ 0	C'	3.5
0 ~ 20	C'	3.5
20 ~ 40	C'	3.6
40 ~ 60	C'	3.8
60 ~ 80	C'	3.9
-40 ~ -20		3.6
-20 ~ 0		3.6
0 ~ 20		3.6
20 ~ 40		3.7
40 ~ 60		3.9
60 ~ 80		4
-40 ~ -20	D	3.9
-20 ~ 0	D	3.9
0 ~ 20	D	4
20 ~ 40	D	4.1
40 ~ 60	D	4.2
60 ~ 80	D	4.4
-40 ~ -20	e	4.3
-20 ~ 0	e	4.3
0 ~ 20	e	4.4
20 ~ 40	e	4.6
40 ~ 60	e	4.8
60 ~ 80	e	5
-40 ~ -20	F	5.4
-20 ~ 0	F	5.4
0 ~ 20	F	5.5
20 ~ 40	F	5.7
40 ~ 60	F	5.9
60 ~ 80	F	6.2
-40 ~ -20	g	6.5
-20 ~ 0	g	6.6
0 ~ 20	g	6.8
20 ~ 40	g	7
40 ~ 60	g	7.3
60 ~ 80	g	7.6