E-SF7 - Hikari

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.639800 n_e = 1.644181	V_d = 34.56 V_e = 34.30	n_F - n_C = 0.018510 n_F' - n_C' = 0.018777	Coloring: 0.385 - 0.360 mkm.

Type: Schott
Spectral range: 0.4046561 - 0.76819 mkm.
C1 = 2.60224509 C2 = -0.00228272809 C3 = 0.0313239043 C4 = -0.00110981516 C5 = 0.00028447243 C6 = -0.000012054467

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	-----
n _s	-----
n _r	1.631409
n _C	1.634386
n _C'	1.635233
n _0.6328	1.636030
n _D	1.639638
n _d	1.639800
n _e	1.644181
n _F	1.652897
n _F'	1.654011
n _g	1.663792
n _h	1.673260
n _i	-----
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	-----
P_C,A'	0.3169
P_d,C	0.2924
P_e,C	0.5291
P_g,d	1.2961
P_g,F	0.5885
P_h,g	0.5114
P_i,g	-----
P_C',t	-----
P_e,C'	0.4833
P_F',e	0.5310
P_i,F'	-----

transmittance: 10 mm
τ_0.36	0.03
τ_0.37	0.33
τ_0.38	0.67
τ_0.39	0.84
τ_0.4	0.916
τ_0.42	0.964
τ_0.44	0.975
τ_0.46	0.981
τ_0.48	0.986
τ_0.5	0.99
τ_0.55	0.995
τ_0.6	0.995
τ_0.65	0.992
τ_0.7	0.993
τ_0.8	0.996
τ_0.9	0.999
τ₁	0.999
τ_1.2	0.999
τ_1.4	0.988
τ_1.6	0.997
τ_1.8	0.988
τ₂	0.975
τ_2.2	0.906
τ_2.4	0.88

Knoop hardness: 498
Abrasion: 109

Resistance to acids: 1

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
100 ~ 300	86