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N-BK7HT
Glass Code: 517642.251
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“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.
| 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 |
Downloads
Data sheet
Download Data sheet N-BK7HT PDF 120 kB Download Safety Data sheet N-BK7HT PDF 110 kB
Collection Datasheets
Optical Glass - Collection Datasheets PDF 5.4 MB
Catalog
Optical Glass Pocket Catalog EN 2022 PDF 2.27 MB
TIE‘s - Technical Information
TIE-04: Test Report for Delivery Lots of Optical Glass-May 2016 PDF 200 kB TIE-19: Temperature coefficient of Refractive Index-July 2016 PDF 414 kB TIE-25: Striae in Optical Glass-June 2006 PDF 1.84 MB TIE-26: hom*ogeneity of Optical Glass-February 2016 PDF 1.44 MB TIE-27: Stress in Optical Glass-July 2004 PDF 694 kB TIE-28: Bubbles and Inclusions in Optical Glass-May 2016 PDF 205 kB TIE-29: Refractive Index and Dispersion-February 2016 PDF 1.89 MB TIE-30: Chemical properties of Optical Glass-February 2016 PDF 128 kB TIE-31: Mechanical and Thermal Properties of Optical Glass-July 2004 PDF 222 kB TIE-32: Thermal Loads on Optical Glass-August 2004 PDF 252 kB TIE-33: Bending Strength of Optical Glass and ZERODUR®-December 2015 PDF 2.71 MB TIE-35: Transmittance of Optical Glass-October 2005 PDF 762 kB TIE-36 Technical Information EN 2022 PDF 710 kB TIE-40: Optical Glass for Precision Molding-September 2011 PDF 526 kB TIE-41: Large Optical Glass Blanks-September 2006 PDF 498 kB
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