K-BK7 - Sumita

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.516329 n_e = 1.518253	V_d = 64.04 V_e = 63.84	n_F - n_C = 0.008061 n_F' - n_C' = 0.008117	Coloring: 0.29 - 0.34 mkm.

Type: Schott
Spectral range: 0.3650146 - 1.01398 mkm.
C1 = 2.2704549 C2 = -0.0099748327 C3 = 0.010468377 C4 = 0.0002797425 C5 = -0.000021706023 C6 = 0.0000014265697

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.506859
n _s	1.509340
n _r	1.512421
n _C	1.513850
n _C'	1.514247
n _0.6328	1.514617
n _D	1.516257
n _d	1.516329
n _e	1.518253
n _F	1.521911
n _F'	1.522365
n _g	1.526221
n _h	1.529779
n _i	1.535839
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8671
P_C,A'	0.3577
P_d,C	0.3075
P_e,C	0.5462
P_g,d	1.2271
P_g,F	0.5346
P_h,g	0.4413
P_i,g	1.1930
P_C',t	0.9163
P_e,C'	0.4969
P_F',e	0.5100
P_i,F'	1.6714

transmittance: 10 mm
τ_0.29	0.024
τ_0.3	0.158
τ_0.31	0.414
τ_0.32	0.65
τ_0.33	0.806
τ_0.34	0.894
τ_0.35	0.94
τ_0.36	0.964
τ_0.37	0.971
τ_0.38	0.974
τ_0.39	0.982
τ_0.4	0.988
τ_0.42	0.988
τ_0.44	0.988
τ_0.46	0.99
τ_0.48	0.99
τ_0.5	0.992
τ_0.55	0.995
τ_0.6	0.997
τ_0.65	0.997
τ_0.7	0.998
τ_0.8	0.998
τ_1.06	0.998
τ_1.5	0.991
τ₂	0.929

transmittance: 25 mm
τ_0.31	0.11
τ_0.32	0.341
τ_0.33	0.583
τ_0.34	0.756
τ_0.35	0.857
τ_0.36	0.913
τ_0.37	0.93
τ_0.38	0.937
τ_0.39	0.957
τ_0.4	0.971
τ_0.42	0.971
τ_0.44	0.971
τ_0.46	0.975
τ_0.48	0.975
τ_0.5	0.982
τ_0.55	0.989
τ_0.6	0.992
τ_0.65	0.992
τ_0.7	0.996
τ_0.8	0.996
τ_1.06	0.996
τ_1.5	0.978
τ₂	0.832

Poisson coef.: 0.209
Rigidity: 330 Pa*10⁸
Young module: 799 Pa*10⁸
Knoop hardness: 589
Abrasion: 100

Climatic resistance: 1
Resistance to acids: 1

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
100 ~ 300	90