S-NPH 2 - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.922859 n_e = 1.934290	V_d = 18.89 V_e = 18.74	n_F - n_C = 0.048836 n_F' - n_C' = 0.049851	Coloring: 0.39 - 0.44 mkm.

Type: Sellmeier
Spectral range: 0.4046561 - 2.325 mkm.
C1 = 2.0386951 C2 = 0.437269641 C3 = 2.96711461 C4 = 0.0170796224 C5 = 0.0749254813 C6 = 174.155354

Refraction index
n _2.3254	-----
n _1.9701	1.850932
n _1.5296	1.861456
n _1.06	1.876008
n _t	1.878071
n _s	1.887582
n _r	1.901812
n _C	1.909157
n _C'	1.911272
n _0.6328	1.913271
n _D	1.922444
n _d	1.922859
n _e	1.934290
n _F	1.957994
n _F'	1.961124
n _g	1.989717
n _h	2.019763
n _i	-----
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.6365
P_C,A'	0.2941
P_d,C	0.2805
P_e,C	0.5146
P_g,d	1.3690
P_g,F	0.6495
P_h,g	0.6152
P_i,g	-----
P_C',t	0.6798
P_e,C'	0.4713
P_F',e	0.5494
P_i,F'	-----

transmittance: 10 mm
τ_0.39	0.02
τ_0.4	0.24
τ_0.42	0.7
τ_0.44	0.85
τ_0.46	0.91
τ_0.48	0.936
τ_0.5	0.953
τ_0.55	0.978
τ_0.6	0.988
τ_0.65	0.99
τ_0.7	0.993
τ_0.8	0.996
τ_0.9	0.996
τ₁	0.996
τ_1.2	0.997
τ_1.4	0.997
τ_1.6	0.996
τ_1.8	0.992
τ₂	0.988
τ_2.2	0.977
τ_2.4	0.961

Poisson coef.: 0.249
Rigidity: 397 Pa*10⁸
Young module: 991 Pa*10⁸
Knoop hardness: 450
Abrasion: 224

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	67
100 ~ 300	83

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	t	-0.6
-20 ~ 0	t	-0.6
0 ~ 20	t	-0.4
20 ~ 40	t	-0.2
60 ~ 80	t	0.2
-40 ~ -20	C'	0.4
-20 ~ 0	C'	0.6
0 ~ 20	C'	0.9
20 ~ 40	C'	1.1
40 ~ 60	C'	1.4
60 ~ 80	C'	1.6
-40 ~ -20		0.5
-20 ~ 0		0.7
0 ~ 20		1
20 ~ 40		1.3
40 ~ 60		1.5
60 ~ 80		1.8
-40 ~ -20	D	1.2
-20 ~ 0	D	1.4
0 ~ 20	D	1.8
20 ~ 40	D	2.1
40 ~ 60	D	2.3
60 ~ 80	D	2.7
-40 ~ -20	e	1.8
-20 ~ 0	e	2.1
0 ~ 20	e	2.5
20 ~ 40	e	2.8
40 ~ 60	e	3.2
60 ~ 80	e	3.6
-40 ~ -20	F	3.8
-20 ~ 0	F	4.3
0 ~ 20	F	4.8
20 ~ 40	F	5.4
40 ~ 60	F	5.9
60 ~ 80	F	6.4
-40 ~ -20	g	6.6
-20 ~ 0	g	7.4
0 ~ 20	g	8.1
20 ~ 40	g	8.8
40 ~ 60	g	9.6
60 ~ 80	g	10.3