TAF4 - Hoya

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.787997 n_e = 1.791947	V_d = 47.49 V_e = 47.25	n_F - n_C = 0.016591 n_F' - n_C' = 0.016757	Coloring: 0.31 - 0.38 mkm.

Type: Schott
Spectral range: 0.36501 - 1.014 mkm.
C1 = 3.1212281 C2 = -0.014119909 C3 = 0.026520622 C4 = 0.00040415763 C5 = 0.000014260634 C6 = 0.0000003164256

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.770000
n _s	1.774346
n _r	1.780182
n _C	1.783000
n _C'	1.783791
n _0.6328	1.784533
n _D	1.787850
n _d	1.787997
n _e	1.791947
n _F	1.799591
n _F'	1.800549
n _g	1.808781
n _h	1.816490
n _i	1.829808
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7835
P_C,A'	0.3389
P_d,C	0.3011
P_e,C	0.5392
P_g,d	1.2526
P_g,F	0.5538
P_h,g	0.4646
P_i,g	1.2673
P_C',t	0.8312
P_e,C'	0.4915
P_F',e	0.5184
P_i,F'	1.7634

transmittance: 5 mm
τ_1.55	0.996
τ_1.5	0.996
τ_1.4	0.997
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	0.999
τ_0.7	0.999
τ_0.65	0.999
τ_0.6	0.999
τ_0.55	0.999
τ_0.5	0.999
τ_0.48	0.999
τ_0.46	0.997
τ_0.44	0.996
τ_0.42	0.994
τ_0.4	0.99
τ_0.39	0.985
τ_0.38	0.978
τ_0.37	0.964
τ_0.36	0.942
τ_0.35	0.898
τ_0.34	0.829
τ_0.33	0.7
τ_0.32	0.464
τ_0.31	0.141

transmittance: 10 mm
τ_1.55	0.993
τ_1.5	0.992
τ_1.4	0.995
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	0.999
τ_0.7	0.999
τ_0.65	0.999
τ_0.6	0.999
τ_0.55	0.999
τ_0.5	0.997
τ_0.48	0.997
τ_0.46	0.993
τ_0.44	0.992
τ_0.42	0.987
τ_0.4	0.98
τ_0.39	0.971
τ_0.38	0.956
τ_0.37	0.93
τ_0.36	0.887
τ_0.35	0.806
τ_0.34	0.687
τ_0.33	0.49
τ_0.32	0.215
τ_0.31	0.02

Poisson coef.: 0.299
Rigidity: 470 Pa*10⁸
Young module: 1219 Pa*10⁸
Knoop hardness: 745
Abrasion: 60

Staining: 2
Resistance to acids: 3

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	58
100 ~ 300	77

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		2.3
-20 ~ 0		2.7
0 ~ 20		3
20 ~ 40		3.4
40 ~ 60		3.7
60 ~ 80		4

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		4.7
-20 ~ 0		4.7
0 ~ 20		4.8
20 ~ 40		4.9
40 ~ 60		5
60 ~ 80		5.2