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N-BK7HT

Glass Code:  517642.251

“N”-glass as an environmentally friendly alternative to conventional lead and arsenic-containing glass types.

HT & HTultra glasses feature enhanced transmission values in the visible spectral range, especially in the blue-violet range.

Find more information in the tabs below or on our website.

Compare glass types with our Interactive Abbe Diagram.

optical glass klein 4zu3.jpg
Characteristics
nd 1.51680 νd 64.17
ne 1.51872 νe 63.96
nF-nC 0.008054 nF'-nC' 0.008110
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Download Data sheet N-BK7HT
Technical Details
Refractive Indices
Characteristics λ [nm]
n2,325.4 2,325.4 1.48921
n1,970.1 1,970.1 1.49495
n1,529.6 1,529.6 1.50091
n1,060.0 1,060.0 1.50669
nt 1,014.0 1.50731
ns 852.1 1.50980
nr 706.5 1.51289
nC 656.3 1.51432
nC' 643.8 1.51472
Characteristics λ [nm]
n632.8 632.8 1.51509
nD 589.3 1.51673
nd 587.6 1.51680
ne 546.1 1.51872
nF 486.1 1.52238
nF' 480.0 1.52283
ng 435.8 1.52668
nh 404.7 1.53024
ni 365.0 1.53627
Characteristics λ [nm]
n334.1 334.1 1.54272
n312.6 312.6 1.54862
n296.7 296.7
n280.4 280.4
n248.3 248.3
Internal Transmittance
Characteristics λ [nm]
τ25/2500 2,500 0.490
τ25/2325 2,325 0.657
τ25/1970 1,970 0.888
τ25/1530 1,530 0.987
τ25/1060 1,060 0.999
τ25/700 700 0.998
τ25/660 660 0.997
τ25/620 620 0.997
τ25/580 580 0.998
τ25/546 546 0.998
τ25/500 500 0.997
τ25/460 460 0.996
τ25/436 436 0.996
τ25/420 420 0.996
τ25/405 405 0.996
τ25/400 400 0.996
τ25/390 390 0.994
τ25/380 380 0.992
τ25/370 370 0.989
τ25/365 365 0.985
τ25/350 350 0.964
τ25/334 334 0.875
τ25/320 320 0.600
τ25/310 310 0.242
τ25/300 300 0.023
τ25/290 290
τ25/280 280
τ25/270 270
τ25/260 260
τ25/250 250
Characteristics λ [nm]
τ10/2500 2,500 0.752
τ10/2325 2,325 0.845
τ10/1970 1,970 0.954
τ10/1530 1,530 0.995
τ10/1060 1,060 0.999
τ10/700 700 0.999
τ10/660 660 0.999
τ10/620 620 0.999
τ10/580 580 0.999
τ10/546 546 0.999
τ10/500 500 0.999
τ10/460 460 0.998
τ10/436 436 0.998
τ10/420 420 0.998
τ10/405 405 0.998
τ10/400 400 0.998
τ10/390 390 0.998
τ10/380 380 0.997
τ10/370 370 0.996
τ10/365 365 0.994
τ10/350 350 0.985
τ10/334 334 0.948
τ10/320 320 0.815
τ10/310 310 0.567
τ10/300 300 0.221
τ10/290 290 0.040
τ10/280 280
τ10/270 270
τ10/260 260
τ10/250 250
Partial Dispersion
Characteristics
Ps,t 0.3098
PC,s 0.5612
Pd,C 0.3076
Pe,d 0.2386
Pg,F 0.5349
Pi,h 0.7483
P's,t 0.3076
P'C',s 0.6062
P'd,C' 0.2566
P'e,d 0.2370
P'g,F' 0.4754
P'i,h 0.7432
Characteristics
ΔPC,t 0.0216
ΔPC,s 0.0087
ΔPF,e -0.0009
ΔPg,F -0.0009
ΔPi,g 0.0035
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