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λ/4 N-BK7 Plano-concave Lenses

  • Transmission wavelength range: 350-2200nm
  • Diameter range: 0.5mm to 300mm
  • Standardized focal lengths and diameters convenient for OEM
  • Ideal for various applications in the visible to NIR region
  • Coating options: uncoated, V-coating or broadband anti-reflection (BBAR) coating
  • Applications: laser scanners, remote sensing,  imaging instruments, fiber lasers, and interferometers
Inquire for custom product  
Code Material Diameter CT ET Focal length Coating Unit Price Delivery Cart
1103-001 N-BK7 12.7 1.8 3.5 -25mm Uncoated $13.0 2~3 Days
1103-002 N-BK7 12.7 1.8 3.5 -25mm 400-700nm AR $21.0 1 week
1103-003 N-BK7 12.7 1.8 3.5 -25mm 700-1100nm AR $21.0 1 week
1103-004 N-BK7 12.7 1.8 3.5 -25mm 1100-1650nm AR $21.0 1 week
1103-005 N-BK7 12.7 2.1 3.5 -30mm Uncoated $13.0 2~3 Days
1103-006 N-BK7 12.7 2.1 3.5 -30mm 400-700nm AR $21.0 1 week
1103-007 N-BK7 12.7 2.1 3.5 -30mm 700-1100nm AR $21.0 1 week
1103-008 N-BK7 12.7 2.1 3.5 -30mm 1100-1650nm AR $21.0 1 week
1103-009 N-BK7 12.7 2.7 3.5 -50mm Uncoated $13.0 2~3 Days
1103-010 N-BK7 12.7 2.7 3.5 -50mm 400-700nm AR $21.0 1 week
1103-011 N-BK7 12.7 2.7 3.5 -50mm 700-1100nm AR $21.0 1 week
1103-012 N-BK7 12.7 2.7 3.5 -50mm 1100-1650nm AR $21.0 1 week
1103-013 N-BK7 25.4 2.7 6.0 -50mm Uncoated $15.0 2~3 Days
1103-014 N-BK7 25.4 2.7 6.0 -50mm 400-700nm AR $21.0 1 week
1103-015 N-BK7 25.4 2.7 6.0 -50mm 700-1100nm AR $21.0 1 week
1103-016 N-BK7 25.4 2.7 6.0 -50mm 1100-1650nm AR $21.0 1 week
1103-017 N-BK7 25.4 2.7 5.0 -70mm Uncoated $15.0 2~3 Days
1103-018 N-BK7 25.4 2.7 5.0 -70mm 400-700nm AR $21.0 1 week
1103-019 N-BK7 25.4 2.7 5.0 -70mm 700-1100nm AR $21.0 1 week
1103-020 N-BK7 25.4 2.7 5.0 -70mm 1100-1650nm AR $21.0 1 week
1103-021 N-BK7 25.4 3.0 4.6 -100mm Uncoated $15.0 2~3 Days
1103-022 N-BK7 25.4 3.0 4.6 -100mm 400-700nm AR $21.0 1 week
1103-023 N-BK7 25.4 3.0 4.6 -100mm 700-1100nm AR $21.0 1 week
1103-024 N-BK7 25.4 3.0 4.6 -100mm 1100-1650nm AR $21.0 1 week
Plano-concave Lens is a bulk optical singlet with a flat side and a convex side, which contribute to a negative focal length and a negative spherical aberration. Plano concave lens diverges collimated light beams from a virtual focus and therefore could be applied to Galilean beam expanders, also as components to increase the focal length of an optical instrument, or balance out the spherical aberration, improving image qualities. N-BK7 glass is a RoHs compliant borosilicate material prevalent for uses in the visible and NIR spectrum (in particular when it comes to manufacturing precision visible components). NBK7 features high optical homogeneities, great resistance to scratches and injuring, and low inclusion content, it is an ideal substitute for UV Fused Silica when high UV transmission is not required, and a preferred alternative for CaF2 at the 1.65-2.3 micro operating wavelength region in the concern of lower manufacturing costs.

Hangzhou Shalom EO offers Stocked and Custom NBK7 Plano-concave Lenses with a diameter range of 0.5-300mm, that are competent for various incorporation into laser scanners, remote sensing,  and imaging instruments, fiber lasers, interferometers, etc. The focal lengths of the stocked N-BK7 Plano-concave lenses differ from -25mm to -100mm, while other focal lengths could be customized. These lenses feature lambda/4 irregularities and 40/20 scratch/dig. Each piece of lens will undergo strict inspection in Shalom EO’s in-house labs before dispatch, to assure tight tolerance and secure your interest.

Note that the transmission range of NBK7 is 350-2200mm, with an absorption dip positioned at approximately 2.8 mirco.  To further enhance the transmission of the NBK7 plano concave lens, Broadband Anti-reflection (BBAR) coatings could be furnished to accommodate the requirements for multi-wavelength and tunable lasers. V coatings, which are a special form of AR coatings that deliver an ultra-low reflection at a narrow band of designed wavelengths are available, too. These coated lenses are in particular advantageous for elevating the efficiencies of complex optical instruments. Besides, Uncoated NBK7 plano-concave lenses are also accessible in Shalom EO.

Application notes:
The curved surface should face the light source (Or in other words, the flat side should point to the focal plane you intend to modulate). 

Specifications:

Lens Form Plano-concaveLens Material N-BK7
Working Wavelength Range 350-2200nm Coating Uncoated, V-coating, BBAR coating
Surface Quality (S/D) 40/20 Irregularity@632.8nm λ/4
Centering Error ≤2 arc min Clear Aperture 90%
Protective Chamfer 0.2mmx45° Diameters 0.5-300mm


BK7 Plano-concave D=12.7 F=-25 Uncoated Lenses

BK7 Plano-concave D=12.7 F=-25 Uncoated Lenses

BK7 Plano-concave D=25.4 F=-50 700-1100nm Coated Lenses

BK7 Plano-concave D=25.4 F=-50 700-1100nm Coated Lenses

BK7 Plano-concave D=12.7 F=-50 1100-1650nm Coated Lenses

BK7 Plano-concave D=12.7 F=-50 1100-1650nm Coated Lenses