BAL 7 - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.588750 n_e = 1.591488	V_d = 51.17 V_e = 50.87	n_F - n_C = 0.011503 n_F' - n_C' = 0.011626	Coloring: 0.32 - 0.36 mkm.

Type: Schott
Spectral range: 0.3650146 - 1.01398 mkm.
C1 = 2.4787185 C2 = -0.0085856348 C3 = 0.015210012 C4 = 0.0006044033 C5 = -0.000038936391 C6 = 0.0000027124338

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.576459
n _s	1.579394
n _r	1.583369
n _C	1.585303
n _C'	1.585847
n _0.6328	1.586358
n _D	1.588648
n _d	1.588750
n _e	1.591488
n _F	1.596806
n _F'	1.597474
n _g	1.603219
n _h	1.608616
n _i	1.618000
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7687
P_C,A'	0.3346
P_d,C	0.2996
P_e,C	0.5377
P_g,d	1.2578
P_g,F	0.5574
P_h,g	0.4690
P_i,g	1.2848
P_C',t	0.8161
P_e,C'	0.4903
P_F',e	0.5203
P_i,F'	1.7843

transmittance: 10 mm
τ_0.36	0.901
τ_0.37	0.94
τ_0.38	0.961
τ_0.39	0.976
τ_0.4	0.984
τ_0.42	0.99
τ_0.44	0.992
τ_0.46	0.994
τ_0.48	0.995
τ_0.5	0.997
τ_0.55	0.998
τ_0.6	0.997
τ_0.65	0.997
τ_0.7	0.998
τ_0.8	0.998
τ_0.9	0.998

Poisson coef.: 0.234
Rigidity: 324 Pa*10⁸
Young module: 800 Pa*10⁸
Knoop hardness: 560
Abrasion: 140

Climatic resistance: 2
Resistance to acids: 4.2
Phosphate resistance: 2.2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	75
100 ~ 300	88

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	2.4
40 ~ 60	t	2.6
60 ~ 80	t	2.7
-40 ~ -20	C'	2.9
-20 ~ 0	C'	2.9
0 ~ 20	C'	2.9
20 ~ 40	C'	3
40 ~ 60	C'	3.1
60 ~ 80	C'	3.3
-40 ~ -20		2.9
-20 ~ 0		2.9
0 ~ 20		2.9
20 ~ 40		3
40 ~ 60		3.1
60 ~ 80		3.3
-40 ~ -20	D	3.1
-20 ~ 0	D	3.1
0 ~ 20	D	3.1
20 ~ 40	D	3.2
40 ~ 60	D	3.3
60 ~ 80	D	3.4
-40 ~ -20	e	3.3
-20 ~ 0	e	3.3
0 ~ 20	e	3.3
20 ~ 40	e	3.4
40 ~ 60	e	3.5
60 ~ 80	e	3.7
-40 ~ -20	F	3.7
-20 ~ 0	F	3.7
0 ~ 20	F	3.8
20 ~ 40	F	3.9
40 ~ 60	F	4
60 ~ 80	F	4.2
-40 ~ -20	g	4.1
-20 ~ 0	g	4.1
0 ~ 20	g	4.2
20 ~ 40	g	4.4
40 ~ 60	g	4.5
60 ~ 80	g	4.8