FTM 8 - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.532564 n_e = 1.535315	V_d = 45.91 V_e = 45.59	n_F - n_C = 0.011599 n_F' - n_C' = 0.011740	Coloring: 0.36 - 0.39 mkm.

Type: Schott
Spectral range: 0.3650146 - 1.01398 mkm.
C1 = 2.3063389 C2 = -0.009299434 C3 = 0.014148541 C4 = 0.00061944948 C5 = -0.00003542134 C6 = 0.0000043560988

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.520228
n _s	1.523210
n _r	1.527191
n _C	1.529119
n _C'	1.529663
n _0.6328	1.530172
n _D	1.532462
n _d	1.532564
n _e	1.535315
n _F	1.540718
n _F'	1.541404
n _g	1.547385
n _h	1.553163
n _i	1.563660
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7664
P_C,A'	0.3313
P_d,C	0.2970
P_e,C	0.5341
P_g,d	1.2777
P_g,F	0.5747
P_h,g	0.4980
P_i,g	1.4030
P_C',t	0.8133
P_e,C'	0.4873
P_F',e	0.5249
P_i,F'	1.9187

transmittance: 10 mm
τ_0.4	0.918
τ_0.42	0.962
τ_0.44	0.974
τ_0.46	0.981
τ_0.48	0.985
τ_0.5	0.989
τ_0.55	0.994
τ_0.6	0.996
τ_0.65	0.996
τ_0.7	0.997

Poisson coef.: 0.236
Rigidity: 246 Pa*10⁸
Young module: 608 Pa*10⁸
Knoop hardness: 450
Abrasion: 147

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

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	85
100 ~ 300	97

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	C'	-0.3
-20 ~ 0	C'	-0.3
0 ~ 20	C'	-0.2
40 ~ 60	C'	0.3
60 ~ 80	C'	0.4
-40 ~ -20	D	-0.1
-20 ~ 0	D	-0.1
20 ~ 40	D	0.2
40 ~ 60	D	0.5
60 ~ 80	D	0.6
-20 ~ 0	e	0.1
0 ~ 20	e	0.2
20 ~ 40	e	0.3
40 ~ 60	e	0.7
60 ~ 80	e	1
-40 ~ -20	F	0.5
-20 ~ 0	F	0.6
0 ~ 20	F	0.8
20 ~ 40	F	1.1
40 ~ 60	F	1.3
60 ~ 80	F	1.5
-40 ~ -20	g	0.8
-20 ~ 0	g	0.9
0 ~ 20	g	1.1
20 ~ 40	g	1.5
40 ~ 60	g	1.7
60 ~ 80	g	2