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Negative Meniscus Lenses
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  • Negative Meniscus Lenses

  • CASTECH offers different spherical lenses, including Plano-Convex Lenses, Plano-Concave Lenses, Bi-Convex Lenses, Bi-Concave Lenses, Meniscus Lenses, Negative Meniscus Lenses and Achromatic Lenses.
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Introduction:

CASTECH offers an extensive line of spherical lenses, including Plano-Convex Lenses, Plano-Concave Lenses, Bi-Convex Lenses, Bi-Concave Lenses, Meniscus Lenses, Negative Meniscus Lenses as well as Achromatic Lenses. CASTECH’s precision spherical lenses are made from a wide variety of optical substrates such as Optical glass, Calcium Fluoride(CaF2), Magnesium Fluoride(MgF2), Fused Silica, Sapphire, Germanium (Ge), Silicon (Si), Zinc Selenide (ZnSe). Together with our multiple coating designs covering wavelength range of Ultraviolet (UV), visible, or Infrared (IR), we offer options that are ideal for use in various applications.

Features:

  • Material from DUV to IR  
  • Custom dimension and shapes  
  • Standard and custom coating options available  
  • High laser damage threshold

Specifications:

Material BK7 or UV fused silica
Focal  Length Tolerance ±1% @589nm
Design Wavelength 589nm
Centration ≤3′
Diameter  Tolerance +0/-0.1mm
Clear Aperture ≥ central 90%  of  diameter
Center Thickness  Tolerance ±0.1mm
Surface Quality 20/10(UVFS)/ 40/20(BK7)
Surface Accuracy

≤ 1.5λ power,λ/2 irregularity(UVFS)

≤ 1.5λ power,λ/4 irregularity(BK7)

Chamfers 0-0.8mm face width×45°±15°

 

 

Order Information:

 

LNS ---- 254 ---- R950 ---- R459 ---- BK7
       
Product Code   Diameter=25.4mm   R1=95mm   R2=-45.9mm   Material

 

BK7 Meniscus  Lenses:

 

Part Number Dia(mm) Tc(mm) Te(mm)

R1(mm)

R2(mm)

EFL(mm)

Material
LNS-254-R950-R459-BK7 25.4 2.86 3.8 95.0 -45.9 -175.0 BK7
LNS-254-R1000-R431-BK7 25.4 3.73 4.77 100 -43.11 -150.0 BK7
LNS-254-R900-R373-BK7 25.4 2.02 3.3 100 -38.973 -125.0 BK7
LNS-254-R900-R326-BK7 25.4 2.32 3.92 100 -33.8 -100 BK7

 

Note:

     Other sizes and focal length are available upon request. Also the lens ring mounts are available upon request.

 

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