BACD4 - Hoya

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.612717 n_e = 1.615211	V_d = 58.57 V_e = 58.30	n_F - n_C = 0.010459 n_F' - n_C' = 0.010551	Coloring: 0.30 - 0.36 mkm.

Type: Schott
Spectral range: 0.36501 - 1.014 mkm.
C1 = 2.5584621 C2 = -0.0097457283 C3 = 0.015110495 C4 = 0.00023273333 C5 = 0.0000011137249 C6 = 0.00000016424767

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.601049
n _s	1.603945
n _r	1.607735
n _C	1.609540
n _C'	1.610046
n _0.6328	1.610518
n _D	1.612624
n _d	1.612717
n _e	1.615211
n _F	1.620000
n _F'	1.620597
n _g	1.625699
n _h	1.630431
n _i	1.638498
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8118
P_C,A'	0.3457
P_d,C	0.3037
P_e,C	0.5421
P_g,d	1.2411
P_g,F	0.5448
P_h,g	0.4524
P_i,g	1.2236
P_C',t	0.8601
P_e,C'	0.4938
P_F',e	0.5149
P_i,F'	1.7114

transmittance: 5 mm
τ_1.55	0.996
τ_1.5	0.996
τ_1.4	0.992
τ_1.3	0.998
τ_1.2	0.998
τ_1.1	0.998
τ_1.06	0.998
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	0.999
τ_0.44	0.999
τ_0.42	0.998
τ_0.4	0.994
τ_0.39	0.992
τ_0.38	0.985
τ_0.37	0.973
τ_0.36	0.949
τ_0.35	0.91
τ_0.34	0.83
τ_0.33	0.71
τ_0.32	0.54
τ_0.31	0.35
τ_0.3	0.18
τ_0.29	0.04

transmittance: 10 mm
τ_1.55	0.991
τ_1.5	0.991
τ_1.4	0.984
τ_1.3	0.996
τ_1.2	0.996
τ_1.1	0.996
τ_1.06	0.996
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	0.999
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	0.997
τ_0.46	0.997
τ_0.44	0.997
τ_0.42	0.996
τ_0.4	0.989
τ_0.39	0.983
τ_0.38	0.971
τ_0.37	0.946
τ_0.36	0.901
τ_0.35	0.82
τ_0.34	0.69
τ_0.33	0.51
τ_0.32	0.3
τ_0.31	0.13
τ_0.3	0.03

Poisson coef.: 0.271
Rigidity: 320 Pa*10⁸
Young module: 812 Pa*10⁸
Knoop hardness: 560
Optical stress coef.: 1.93 1/Pa*10¹²
Abrasion: 140

Staining: 4
Resistance to acids: 4

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	66
100 ~ 300	77

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		0.2
-20 ~ 0		0.6
0 ~ 20		1
20 ~ 40		1.2
40 ~ 60		1.5
60 ~ 80		1.7

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		2.4
-20 ~ 0		2.5
0 ~ 20		2.6
20 ~ 40		2.6
40 ~ 60		2.7
60 ~ 80		2.8