BSL7Y - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.516330 n_e = 1.518248	V_d = 64.24 V_e = 64.04	n_F - n_C = 0.008037 n_F' - n_C' = 0.008091	Coloring: 0.29 - 0.32 mkm.

Type: Sellmeier
Spectral range: 0.326 - 2.325 mkm.
C1 = 1.13329383 C2 = 0.136897201 C3 = 0.703456004 C4 = 0.00669407868 C5 = 0.023739176 C6 = 70.7030316

Refraction index
n _2.3254	-----
n _1.9701	1.494032
n _1.5296	1.500256
n _1.06	1.506180
n _t	1.506808
n _s	1.509325
n _r	1.512425
n _C	1.513855
n _C'	1.514252
n _0.6328	1.514621
n _D	1.516258
n _d	1.516330
n _e	1.518248
n _F	1.521892
n _F'	1.522343
n _g	1.526186
n _h	1.529730
n _i	1.535738
n _0.3341	1.542192
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8767
P_C,A'	0.3597
P_d,C	0.3079
P_e,C	0.5465
P_g,d	1.2263
P_g,F	0.5343
P_h,g	0.4409
P_i,g	1.1885
P_C',t	0.9261
P_e,C'	0.4972
P_F',e	0.5095
P_i,F'	1.6666

transmittance: 10 mm
τ_0.29	0.06
τ_0.3	0.43
τ_0.31	0.78
τ_0.32	0.932
τ_0.33	0.978
τ_0.34	0.991
τ_0.35	0.996
τ_0.36	0.997
τ_0.365	0.998
τ_0.37	0.998
τ_0.38	0.998
τ_0.39	0.999
τ_0.4	0.999
τ_0.42	0.999
τ_0.44	0.999
τ_0.46	0.999
τ_0.48	0.999
τ_0.5	0.999
τ_0.55	0.999
τ_0.6	0.999
τ_0.65	0.999
τ_0.7	0.999
τ_0.8	0.999
τ_0.9	0.999
τ₁	0.997
τ_1.2	0.997
τ_1.4	0.969
τ_1.6	0.99
τ_1.8	0.981
τ₂	0.962
τ_2.2	0.86
τ_2.4	0.8

Poisson coef.: 0.207
Rigidity: 336 Pa*10⁸
Young module: 811 Pa*10⁸
Knoop hardness: 570
Abrasion: 87

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	68
100 ~ 300	81

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	t	2.3
-20 ~ 0	t	2.4
0 ~ 20	t	2.5
20 ~ 40	t	2.6
40 ~ 60	t	2.8
60 ~ 80	t	2.9
-40 ~ -20	C'	2.6
-20 ~ 0	C'	2.7
0 ~ 20	C'	2.8
20 ~ 40	C'	3
40 ~ 60	C'	3.1
60 ~ 80	C'	3.2
-40 ~ -20		2.6
-20 ~ 0		2.7
0 ~ 20		2.9
20 ~ 40		3
40 ~ 60		3.1
60 ~ 80		3.2
-40 ~ -20	D	2.7
-20 ~ 0	D	2.8
0 ~ 20	D	3
20 ~ 40	D	3.1
40 ~ 60	D	3.2
60 ~ 80	D	3.3
-40 ~ -20	e	2.8
-20 ~ 0	e	2.9
0 ~ 20	e	3.1
20 ~ 40	e	3.2
40 ~ 60	e	3.3
60 ~ 80	e	3.4
-40 ~ -20	F	3
-20 ~ 0	F	3.2
0 ~ 20	F	3.3
20 ~ 40	F	3.5
40 ~ 60	F	3.6
60 ~ 80	F	3.7
-40 ~ -20	g	3.2
-20 ~ 0	g	3.4
0 ~ 20	g	3.6
20 ~ 40	g	3.7
40 ~ 60	g	3.9
60 ~ 80	g	4
-40 ~ -20	i	3.8
-20 ~ 0	i	4
0 ~ 20	i	4.2
20 ~ 40	i	4.4
40 ~ 60	i	4.6
60 ~ 80	i	4.8