S-BSM18 - O'Hara

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.638538 n_e = 1.641285	V_d = 55.38 V_e = 55.09	n_F - n_C = 0.011530 n_F' - n_C' = 0.011639	Coloring: 0.34 - 0.38 mkm.

Type: Sellmeier
Spectral range: 0.3650146 - 2.325 mkm.
C1 = 1.17997553 C2 = 0.457534888 C3 = 1.25404461 C4 = 0.00518384733 C5 = 0.023166567 C6 = 120.593261

Refraction index
n _2.3254	-----
n _1.9701	1.612492
n _1.5296	1.618608
n _1.06	1.625059
n _t	1.625808
n _s	1.628950
n _r	1.633079
n _C	1.635053
n _C'	1.635607
n _0.6328	1.636124
n _D	1.638436
n _d	1.638538
n _e	1.641285
n _F	1.646583
n _F'	1.647246
n _g	1.652933
n _h	1.658246
n _i	1.667390
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8018
P_C,A'	0.3426
P_d,C	0.3022
P_e,C	0.5404
P_g,d	1.2484
P_g,F	0.5507
P_h,g	0.4607
P_i,g	1.2538
P_C',t	0.8498
P_e,C'	0.4924
P_F',e	0.5170
P_i,F'	1.7470

transmittance: 10 mm
τ_0.33	0.01
τ_0.34	0.19
τ_0.35	0.52
τ_0.36	0.75
τ_0.37	0.88
τ_0.38	0.938
τ_0.39	0.966
τ_0.4	0.98
τ_0.42	0.99
τ_0.44	0.994
τ_0.46	0.995
τ_0.48	0.997
τ_0.5	0.998
τ_0.55	0.999
τ_0.6	0.998
τ_0.65	0.998
τ_0.7	0.999
τ_0.8	0.998
τ_0.9	0.998
τ₁	0.997
τ_1.2	0.996
τ_1.4	0.991
τ_1.6	0.992
τ_1.8	0.983
τ₂	0.969
τ_2.2	0.914
τ_2.4	0.8

Poisson coef.: 0.27
Rigidity: 343 Pa*10⁸
Young module: 871 Pa*10⁸
Knoop hardness: 540
Abrasion: 157

Climatic resistance: 3
Resistance to acids: 53.2
Phosphate resistance: 4.2

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	69
100 ~ 300	81

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20	t	1.2
-20 ~ 0	t	1.2
0 ~ 20	t	1.3
20 ~ 40	t	1.4
40 ~ 60	t	1.4
60 ~ 80	t	1.5
-40 ~ -20	C'	1.5
-20 ~ 0	C'	1.6
0 ~ 20	C'	1.7
20 ~ 40	C'	1.8
40 ~ 60	C'	1.8
60 ~ 80	C'	1.9
-40 ~ -20		1.5
-20 ~ 0		1.6
0 ~ 20		1.7
20 ~ 40		1.8
40 ~ 60		1.9
60 ~ 80		2
-40 ~ -20	D	1.7
-20 ~ 0	D	1.8
0 ~ 20	D	1.8
20 ~ 40	D	1.9
40 ~ 60	D	2
60 ~ 80	D	2.1
-40 ~ -20	e	1.8
-20 ~ 0	e	1.9
0 ~ 20	e	2
20 ~ 40	e	2.1
40 ~ 60	e	2.2
60 ~ 80	e	2.3
-40 ~ -20	F	2.1
-20 ~ 0	F	2.2
0 ~ 20	F	2.3
20 ~ 40	F	2.5
40 ~ 60	F	2.6
60 ~ 80	F	2.7
-40 ~ -20	g	2.4
-20 ~ 0	g	2.6
0 ~ 20	g	2.7
20 ~ 40	g	2.8
40 ~ 60	g	3
60 ~ 80	g	3.1