BPH 8 - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.720466 n_e = 1.725383	V_d = 34.71 V_e = 34.48	n_F - n_C = 0.020753 n_F' - n_C' = 0.021034	Coloring: 0.34 - 0.40 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.325 mkm.
C1 = 1.59323023 C2 = 0.277775516 C3 = 1.04070526 C4 = 0.0103458172 C5 = 0.0474089271 C6 = 81.2863792

Refraction index
n _2.3254	-----
n _1.9701	1.681224
n _1.5296	1.689078
n _1.06	1.698075
n _t	1.699204
n _s	1.704130
n _r	1.710978
n _C	1.714361
n _C'	1.715319
n _0.6328	1.716220
n _D	1.720285
n _d	1.720466
n _e	1.725383
n _F	1.735114
n _F'	1.736353
n _g	1.747206
n _h	1.757712
n _i	1.776756
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7303
P_C,A'	0.3230
P_d,C	0.2942
P_e,C	0.5311
P_g,d	1.2884
P_g,F	0.5826
P_h,g	0.5062
P_i,g	1.4239
P_C',t	0.7765
P_e,C'	0.4849
P_F',e	0.5286
P_i,F'	1.9468

transmittance: 10 mm
τ_0.33	0.01
τ_0.34	0.13
τ_0.35	0.32
τ_0.36	0.51
τ_0.37	0.67
τ_0.38	0.79
τ_0.39	0.87
τ_0.4	0.923
τ_0.42	0.967
τ_0.44	0.984
τ_0.46	0.991
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	0.997
τ_0.9	0.997
τ₁	0.996
τ_1.2	0.996
τ_1.4	0.976
τ_1.6	0.981
τ_1.8	0.968
τ₂	0.93
τ_2.2	0.77
τ_2.4	0.55

Poisson coef.: 0.273
Rigidity: 278 Pa*10⁸
Young module: 707 Pa*10⁸
Knoop hardness: 450
Abrasion: 166

Climatic resistance: 4
Resistance to acids: 53.2
Phosphate resistance: 4.2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	54
100 ~ 300	67

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	t	5.3
-20 ~ 0	t	5.4
0 ~ 20	t	5.6
20 ~ 40	t	5.8
40 ~ 60	t	5.9
60 ~ 80	t	6.1
-40 ~ -20	C'	6.1
-20 ~ 0	C'	6.3
0 ~ 20	C'	6.5
20 ~ 40	C'	6.6
40 ~ 60	C'	6.8
60 ~ 80	C'	7
-40 ~ -20		6.2
-20 ~ 0		6.4
0 ~ 20		6.5
20 ~ 40		6.7
40 ~ 60		6.9
60 ~ 80		7.1
-40 ~ -20	D	6.5
-20 ~ 0	D	6.7
0 ~ 20	D	6.9
20 ~ 40	D	7
40 ~ 60	D	7.2
60 ~ 80	D	7.4
-40 ~ -20	e	6.9
-20 ~ 0	e	7.1
0 ~ 20	e	7.3
20 ~ 40	e	7.5
40 ~ 60	e	7.7
60 ~ 80	e	7.9
-40 ~ -20	F	7.8
-20 ~ 0	F	8
0 ~ 20	F	8.2
20 ~ 40	F	8.4
40 ~ 60	F	8.7
60 ~ 80	F	8.9
-40 ~ -20	g	8.7
-20 ~ 0	g	9
0 ~ 20	g	9.3
20 ~ 40	g	9.5
40 ~ 60	g	9.8
60 ~ 80	g	10.1