Compare Model Drawings, CAD & Specs Diameter Thickness Antireflection Coating Availability Price
05BW40-30
$112
05BW40-30 12.7 mm 6.0 mm Uncoated $112
05BW40-30AR.14
$123
05BW40-30AR.14 12.7 mm 6.0 mm 430-700 nm $123
05BW40-30AR.18
$141
05BW40-30AR.18 12.7 mm 6.0 mm 1000-1550 nm $141
10BW40-30
$152
10BW40-30 25.4 mm 6.0 mm Uncoated $152
10BW40-30AR.14
$164
10BW40-30AR.14 25.4 mm 6.0 mm 430-700 nm $164
10BW40-30AR.16
$181
10BW40-30AR.16 25.4 mm 6.0 mm 650-1000 nm $181
10BW40-30AR.18
$181
10BW40-30AR.18 25.4 mm 6.0 mm 1000-1550 nm $181
20BW40-30
$250
20BW40-30 50.8 mm 10.0 mm Uncoated $250
20BW40-30AR.14
$264
20BW40-30AR.14 50.8 mm 10.0 mm 430-700 nm $264
20BW40-30AR.16
$282
20BW40-30AR.16 50.8 mm 10.0 mm 650-1000 nm $282
20BW40-30AR.18
$282
20BW40-30AR.18 50.8 mm 10.0 mm 1000-1550 nm $282

Specifications

  • Material
    Grade A N-BK7
  • Surface Flatness
    λ/20 @ 632.8 nm
  • Surface Quality
    10-5 scratch-dig
  • Thickness Tolerance
    ±0.25 mm
  • Transmitted Beam Deviation
    ±30 arc sec
  • Chamfers
    12.7 & 25.4 mm: 0.25-0.75 mm face width
    50.8 mm: 0.38-1.14 mm face width
  • Chamfers Angle/Tolerance
    45° ±15°
  • Cleaning
    See How to Clean Optics
  • Clear Aperture
    Central 85% of diameter
  • Diameter Tolerance
    +0/-0.15 mm
  • Wedge
    ≤30 arc sec
  • Damage Threshold
    7.5 J/cm2, 10 ns pulses, 20 Hz for coated models

Features

High Precision Manufacturing

These N-BK7 parallel windows are manufactured to the highest precision with flatness better than λ/20 for low distortion and < 30 arc second parallelism for exceptionally low beam deviation.

N-BK7 for VIS and NIR Applications

N-BK7 is an excellent lens material for most visible and near infrared applications. It is the most common borosilicate crown optical glass, and it provides great performance at a good value. Its high homogeneity, low bubble and inclusion content, and straightforward manufacturability make it a good choice for transmissive optics.

Broadband Visible Antireflection Coatings

Our AR.14 broadband multilayer antireflection coating markedly improves the transmission efficiency of these lenses by reducing surface reflections over a 430-700 nm wavelength range. This AR coating performs effectively for multiple visible wavelengths and tunable lasers eliminating the need for several sets of optics.

Broadband Multilayer NIR Antireflection Coating

Our AR.16 coating is recommended for NIR applications in the 650-1000 nm range.

Broadband Multilayer IR Antireflection Coating

Our AR.18 coating is for IR applications in the 1000-1550 nm range.

RoHS Compliant

These windows have been tested for dangerous substances like Pb, Cd, Hg, Hex-Cr, PBB, and PBDE and have been found to be in compliance with RoHS allowable levels.

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