M-NBF1 - Hoya

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.743299 n_e = 1.746889	V_d = 49.32 V_e = 49.07	n_F - n_C = 0.015069 n_F' - n_C' = 0.015220	Coloring: 0.28 - 0.36 mkm.

Type: Schott
Spectral range: 0.36501 - 1.014 mkm.
C1 = 2.9752454 C2 = -0.014250162 C3 = 0.021400735 C4 = 0.00097553366 C5 = -0.000069795303 C6 = 0.0000041149237

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.726925
n _s	1.730911
n _r	1.736210
n _C	1.738764
n _C'	1.739482
n _0.6328	1.740155
n _D	1.743166
n _d	1.743299
n _e	1.746889
n _F	1.753833
n _F'	1.754702
n _g	1.762162
n _h	1.769128
n _i	1.781143
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7856
P_C,A'	0.3383
P_d,C	0.3009
P_e,C	0.5391
P_g,d	1.2517
P_g,F	0.5527
P_h,g	0.4622
P_i,g	1.2595
P_C',t	0.8333
P_e,C'	0.4915
P_F',e	0.5185
P_i,F'	1.7546

transmittance: 5 mm
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	0.995
τ_0.39	0.993
τ_0.38	0.988
τ_0.37	0.979
τ_0.36	0.965
τ_0.35	0.94
τ_0.34	0.9
τ_0.33	0.85
τ_0.32	0.77
τ_0.31	0.62
τ_0.3	0.54
τ_0.29	0.38
τ_0.28	0.19

transmittance: 10 mm
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	0.998
τ_0.42	0.996
τ_0.4	0.991
τ_0.39	0.986
τ_0.38	0.976
τ_0.37	0.959
τ_0.36	0.932
τ_0.35	0.88
τ_0.34	0.81
τ_0.33	0.72
τ_0.32	0.59
τ_0.31	0.39
τ_0.3	0.29
τ_0.29	0.14
τ_0.28	0.03

Poisson coef.: 0.307
Rigidity: 423 Pa*10⁸
Young module: 1105 Pa*10⁸
Knoop hardness: 665
Optical stress coef.: 2.26 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	54
100 ~ 300	72

Temperature coefs. of n_abs
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		4.6
-20 ~ 0		5.5
0 ~ 20		6.2
20 ~ 40		6.7
40 ~ 60		7.2
60 ~ 80		7.5

Temperature coefs. of n_rel
Temp. range, C	Wave length, mkm.	Value, 1/C*10^-6
-40 ~ -20		6.9
-20 ~ 0		7.5
0 ~ 20		7.9
20 ~ 40		8.2
40 ~ 60		8.5
60 ~ 80		8.7