FTL 8 - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.511179 n_e = 1.513559	V_d = 51.02 V_e = 50.69	n_F - n_C = 0.010019 n_F' - n_C' = 0.010130	Coloring: 0.36 - 0.39 mkm.

Type: Schott
Spectral range: 0.4046561 - 1.01398 mkm.
C1 = 2.2498663 C2 = -0.010009969 C3 = 0.010686269 C4 = 0.00098510593 C5 = -0.00010138667 C6 = 0.0000070446543

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.500270
n _s	1.502978
n _r	1.506495
n _C	1.508182
n _C'	1.508656
n _0.6328	1.509100
n _D	1.511090
n _d	1.511179
n _e	1.513559
n _F	1.518201
n _F'	1.518786
n _g	1.523858
n _h	1.528703
n _i	-----
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7896
P_C,A'	0.3362
P_d,C	0.2991
P_e,C	0.5367
P_g,d	1.2654
P_g,F	0.5646
P_h,g	0.4836
P_i,g	-----
P_C',t	0.8369
P_e,C'	0.4894
P_F',e	0.5216
P_i,F'	-----

transmittance: 10 mm
τ_0.39	0.905
τ_0.4	0.951
τ_0.42	0.978
τ_0.44	0.985
τ_0.46	0.99
τ_0.48	0.992
τ_0.5	0.994
τ_0.55	0.997
τ_0.6	0.997
τ_0.65	0.997
τ_0.7	0.997
τ_2.3254	0.85
τ_1.9701	0.95
τ_1.5296	0.998
τ_1.06	0.999
τ_0.66	0.999
τ_0.62	0.999
τ_0.58	0.999
τ_0.54607	0.998
τ_0.4358	0.998
τ_0.4047	0.997
τ_0.38	0.989
τ_0.37	0.984
τ_0.365	0.981
τ_0.35	0.954
τ_0.3341	0.83
τ_0.32	0.36

transmittance: 25 mm
τ_2.3254	0.66
τ_1.9701	0.87
τ_1.5296	0.995
τ_1.06	0.998
τ_0.7	0.998
τ_0.66	0.998
τ_0.62	0.998
τ_0.58	0.997
τ_0.54607	0.996
τ_0.5	0.996
τ_0.46	0.995
τ_0.4358	0.994
τ_0.42	0.993
τ_0.4047	0.992
τ_0.4	0.992
τ_0.39	0.984
τ_0.38	0.973
τ_0.37	0.961
τ_0.365	0.954
τ_0.35	0.89
τ_0.3341	0.63
τ_0.32	0.08

Poisson coef.: 0.239
Rigidity: 228 Pa*10⁸
Young module: 565 Pa*10⁸
Knoop hardness: 430
Abrasion: 137

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

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	90
100 ~ 300	100
20 ~ 300	106

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-1.3
20 ~ 40		-0.6
60 ~ 80		-0.3
-40 ~ -20	e	-0.2
20 ~ 40	e	0.7
60 ~ 80	e	1.1
-40 ~ -20	g	0.9
20 ~ 40	g	2
60 ~ 80	g	2.6

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	t	-1.4
-20 ~ 0	t	-1.5
0 ~ 20	t	-1.5
20 ~ 40	t	-1.4
40 ~ 60	t	-1.4
60 ~ 80	t	-1.4
-40 ~ -20	C'	-1.1
-20 ~ 0	C'	-1.1
0 ~ 20	C'	-1.1
20 ~ 40	C'	-1
40 ~ 60	C'	-1
60 ~ 80	C'	-0.8
-40 ~ -20		-1.1
-20 ~ 0		-1.1
0 ~ 20		-1.1
20 ~ 40		-1
40 ~ 60		-1
60 ~ 80		-0.8
-40 ~ -20	D	-1
-20 ~ 0	D	-1
0 ~ 20	D	-1
20 ~ 40	D	-0.9
40 ~ 60	D	-0.8
60 ~ 80	D	-0.7
-40 ~ -20	e	-0.8
-20 ~ 0	e	-0.8
0 ~ 20	e	-0.8
20 ~ 40	e	-0.7
40 ~ 60	e	-0.6
60 ~ 80	e	-0.5
-40 ~ -20	F	-0.5
-20 ~ 0	F	-0.5
0 ~ 20	F	-0.5
20 ~ 40	F	-0.4
40 ~ 60	F	-0.2
-40 ~ -20	g	-0.1
-20 ~ 0	g	-0.1
0 ~ 20	g	-0.1
40 ~ 60	g	0.2
60 ~ 80	g	0.4
-40 ~ -20		0.8
20 ~ 40		0.8
60 ~ 80		0.8
20 ~ 40	g	3.4