E-FD4 - Hoya

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.755199 n_e = 1.761671	V_d = 27.53 V_e = 27.31	n_F - n_C = 0.027431 n_F' - n_C' = 0.027887	Coloring: 0.37 - 0.43 mkm.

Type: Schott
Spectral range: 0.40466 - 1.014 mkm.
C1 = 2.9673173 C2 = -0.013989565 C3 = 0.03345668 C4 = 0.0030717804 C5 = -0.00026682435 C6 = 0.000028950241

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.728629
n _s	1.734494
n _r	1.742988
n _C	1.747293
n _C'	1.748524
n _0.6328	1.749683
n _D	1.754962
n _d	1.755199
n _e	1.761671
n _F	1.774724
n _F'	1.776411
n _g	1.791433
n _h	-----
n _i	-----
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.6803
P_C,A'	0.3086
P_d,C	0.2882
P_e,C	0.5241
P_g,d	1.3208
P_g,F	0.6090
P_h,g	-----
P_i,g	-----
P_C',t	0.7252
P_e,C'	0.4792
P_F',e	0.5373
P_i,F'	-----

transmittance: 5 mm
τ_1.55	0.998
τ_1.5	0.998
τ_1.4	0.998
τ_1.3	0.999
τ_1.2	0.999
τ_1.1	0.999
τ_1.06	0.999
τ_1.05	0.999
τ₁	0.999
τ_0.95	0.999
τ_0.9	0.999
τ_0.85	0.999
τ_0.83	0.999
τ_0.8	0.999
τ_0.78	0.999
τ_0.75	0.998
τ_0.7	0.998
τ_0.65	0.997
τ_0.6	0.998
τ_0.55	0.997
τ_0.5	0.992
τ_0.48	0.988
τ_0.46	0.985
τ_0.44	0.978
τ_0.42	0.96
τ_0.4	0.91
τ_0.39	0.83
τ_0.38	0.68
τ_0.37	0.38
τ_0.36	0.09

transmittance: 10 mm
τ_1.55	0.996
τ_1.5	0.996
τ_1.4	0.996
τ_1.3	0.999
τ_1.2	0.999
τ_1.1	0.999
τ_1.06	0.998
τ_1.05	0.998
τ₁	0.998
τ_0.95	0.998
τ_0.9	0.998
τ_0.85	0.998
τ_0.83	0.998
τ_0.8	0.998
τ_0.78	0.998
τ_0.75	0.997
τ_0.7	0.996
τ_0.65	0.994
τ_0.6	0.995
τ_0.55	0.994
τ_0.5	0.984
τ_0.48	0.977
τ_0.46	0.97
τ_0.44	0.957
τ_0.42	0.93
τ_0.4	0.82
τ_0.39	0.7
τ_0.38	0.46
τ_0.37	0.15
τ_0.36	0.01

Poisson coef.: 0.256
Rigidity: 362 Pa*10⁸
Young module: 908 Pa*10⁸
Knoop hardness: 550
Abrasion: 160

Staining: 1
Resistance to acids: 1

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	87
100 ~ 300	104

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		-1.1
-20 ~ 0		-0.6
0 ~ 20		-0.2
20 ~ 40		0.1
40 ~ 60		0.4
60 ~ 80		0.7

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		1.3
-20 ~ 0		1.4
0 ~ 20		1.5
20 ~ 40		1.6
40 ~ 60		1.8
60 ~ 80		1.9