LAL58 - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.693495 n_e = 1.696744	V_d = 50.80 V_e = 50.52	n_F - n_C = 0.013649 n_F' - n_C' = 0.013790	Coloring: 0.33 - 0.38 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.325 mkm.
C1 = 1.53414991 C2 = 0.274494553 C3 = 1.21052663 C4 = 0.00801449705 C5 = 0.0302370141 C6 = 118.744226

Refraction index
n _2.3254	-----
n _1.9701	1.665253
n _1.5296	1.671281
n _1.06	1.678002
n _t	1.678821
n _s	1.682333
n _r	1.687088
n _C	1.689394
n _C'	1.690043
n _0.6328	1.690650
n _D	1.693374
n _d	1.693495
n _e	1.696744
n _F	1.703043
n _F'	1.703833
n _g	1.710629
n _h	1.717001
n _i	1.728021
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7746
P_C,A'	0.3367
P_d,C	0.3004
P_e,C	0.5385
P_g,d	1.2552
P_g,F	0.5557
P_h,g	0.4668
P_i,g	1.2741
P_C',t	0.8221
P_e,C'	0.4909
P_F',e	0.5193
P_i,F'	1.7720

transmittance: 10 mm
τ_0.33	0.02
τ_0.34	0.23
τ_0.35	0.55
τ_0.36	0.77
τ_0.37	0.87
τ_0.38	0.933
τ_0.39	0.959
τ_0.4	0.973
τ_0.42	0.986
τ_0.44	0.99
τ_0.46	0.993
τ_0.48	0.995
τ_0.5	0.997
τ_0.55	0.999
τ_0.6	0.998
τ_0.65	0.998
τ_0.7	0.999
τ_0.8	0.999
τ_0.9	0.998
τ₁	0.998
τ_1.2	0.998
τ_1.4	0.996
τ_1.6	0.995
τ_1.8	0.987
τ₂	0.973
τ_2.2	0.93
τ_2.4	0.8

Poisson coef.: 0.288
Rigidity: 341 Pa*10⁸
Young module: 879 Pa*10⁸
Knoop hardness: 510
Abrasion: 189

Climatic resistance: 3
Resistance to acids: 53.2
Phosphate resistance: 4.2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	78
100 ~ 300	91

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	t	0.2
-20 ~ 0	t	0.2
0 ~ 20	t	0.3
20 ~ 40	t	0.3
40 ~ 60	t	0.3
60 ~ 80	t	0.4
-40 ~ -20	C'	0.6
-20 ~ 0	C'	0.6
0 ~ 20	C'	0.7
20 ~ 40	C'	0.7
40 ~ 60	C'	0.8
60 ~ 80	C'	0.9
-40 ~ -20		0.6
-20 ~ 0		0.7
0 ~ 20		0.7
20 ~ 40		0.8
40 ~ 60		0.8
60 ~ 80		0.9
-40 ~ -20	D	0.7
-20 ~ 0	D	0.8
0 ~ 20	D	0.9
20 ~ 40	D	0.9
40 ~ 60	D	1
60 ~ 80	D	1.1
-40 ~ -20	e	0.9
-20 ~ 0	e	1
0 ~ 20	e	1.1
20 ~ 40	e	1.2
40 ~ 60	e	1.2
60 ~ 80	e	1.3
-40 ~ -20	F	1.3
-20 ~ 0	F	1.4
0 ~ 20	F	1.5
20 ~ 40	F	1.6
40 ~ 60	F	1.7
60 ~ 80	F	1.8
-40 ~ -20	g	1.8
-20 ~ 0	g	1.9
0 ~ 20	g	2
20 ~ 40	g	2.1
40 ~ 60	g	2.2
60 ~ 80	g	2.3