NBF1 - Hoya

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.743299 n_e = 1.746899	V_d = 49.22 V_e = 48.98	n_F - n_C = 0.015101 n_F' - n_C' = 0.015245	Coloring: 0.30 - 0.37 mkm.

Type: Schott
Spectral range: 0.36501 - 1.014 mkm.
C1 = 2.9753491 C2 = -0.01461347 C3 = 0.021096383 C4 = 0.001198038 C5 = -0.00011887388 C6 = 0.000007344435

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.726810
n _s	1.730832
n _r	1.736170
n _C	1.738741
n _C'	1.739463
n _0.6328	1.740139
n _D	1.743165
n _d	1.743299
n _e	1.746899
n _F	1.753842
n _F'	1.754709
n _g	1.762139
n _h	1.769071
n _i	1.781088
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7900
P_C,A'	0.3399
P_d,C	0.3018
P_e,C	0.5402
P_g,d	1.2476
P_g,F	0.5494
P_h,g	0.4590
P_i,g	1.2547
P_C',t	0.8379
P_e,C'	0.4923
P_F',e	0.5172
P_i,F'	1.7468

transmittance: 5 mm
τ_1.55	0.995
τ_1.5	0.995
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	0.999
τ_0.48	0.999
τ_0.46	0.998
τ_0.44	0.997
τ_0.42	0.995
τ_0.4	0.992
τ_0.39	0.99
τ_0.38	0.985
τ_0.37	0.976
τ_0.36	0.963
τ_0.35	0.939
τ_0.34	0.901
τ_0.33	0.843
τ_0.32	0.732
τ_0.31	0.51
τ_0.3	0.194
τ_0.29	0.025

transmittance: 10 mm
τ_1.55	0.991
τ_1.5	0.989
τ_1.4	0.99
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	0.998
τ_0.78	0.999
τ_0.75	0.998
τ_0.7	0.999
τ_0.65	0.999
τ_0.6	0.999
τ_0.55	0.999
τ_0.5	0.998
τ_0.48	0.998
τ_0.46	0.996
τ_0.44	0.993
τ_0.42	0.991
τ_0.4	0.985
τ_0.39	0.98
τ_0.38	0.97
τ_0.37	0.953
τ_0.36	0.926
τ_0.35	0.881
τ_0.34	0.813
τ_0.33	0.71
τ_0.32	0.536
τ_0.31	0.261
τ_0.3	0.038

Poisson coef.: 0.308
Rigidity: 416 Pa*10⁸
Young module: 1088 Pa*10⁸
Knoop hardness: 675
Optical stress coef.: 2.28 1/Pa*10¹²
Abrasion: 70

Staining: 4
Resistance to acids: 4

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-30 ~ 70	53
100 ~ 300	76

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		5.6
-20 ~ 0		5.9
0 ~ 20		6.2
20 ~ 40		6.4
40 ~ 60		6.7
60 ~ 80		6.9

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		8
-20 ~ 0		7.9
0 ~ 20		7.9
20 ~ 40		7.9
40 ~ 60		8
60 ~ 80		8.1