Lens
Lens
Lens
Lens
Lens
Lens
Lens


Lenses

 

Spherical lenses, also known as singlets, are transparent optical components consisting of one or more pieces of optical glass with surfaces so curved that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object.

 

There are seven main spherical lens forms or shapes that determine the imaging characteristics of the lenses. They are plano-convex, plano-concave, convex-convex, concave-concave, meniscus, aspheric, and ball.

 

Plano-convex lenses have a positive focal length which makes them ideal for collecting and focusing light for many imaging applications. Plano-concave lenses have a negative focal length and are used for image reduction or to spread light. Convex-convex lenses have a positive focal length and are useful for 1:1 imaging and in multi-element systems and it’s also known as biconvex or equiconvex.

 

Concave-concave lenses have negative focal length, and are used for image reduction and to spread light and it’s also known as biconcave or equiconcave.

 

Meniscus lenses can increase the numerical aperture of a positive lens assembly, without an undue increase in the aberrations. Aspheric lenses compensate for spherical aberration and are used primarily for their light gathering ability. Ball lenses are used to provide short focal lengths for use with collimated light. They are often used in fiber coupling applications. The above seven are the most common types, meanwhile there are also other styles of spherical lenses available.


Higher Precision and capability:

technology

item

parameter

curve   rate radius

R≥1.7

surface   form precision

N≥±1

N≥0.1

center   thickness

d≥0.3

toleranceT≥±0.01

cosmetic   failure

≥20-10

diameter

D≥1.8

toleranceT≥±0.004

center   thickness/diameter

1/25

center   deviation

C≥15″

coating

depends   on request
  (single layer,muti-layer)

 

Processing technology

1.   polishing

dia.:φ1.8~125

curve rate radius:R1.7~∞

fringeN≥±1

astigmatismN≥0.1

center   thickness≥0.3mm

center   thickness/diameter0.040.6

2.   centering

dia.   tolerance≥±0.005

centeringC≥15″

inner   diameter. depth15mm以下

edge   thickness25mm以下

irregular   shape/ D shape/H
  shape/Z shape

Z   parameter≥0.02

3.   coating

broad   band anti-reflecting coating


high   reflecting coating


beam   splitter and various
  filter coating


4.   cementing

dia.φ3100

thickness   tolerance≥±0.01

lens   group: below 4 single
  lenses cementing


5.   painting

dia.φ3以上

lacqueer   thickness0.0010.02mm

silk-screen


 

 

Plano-Convex   Lenses

Standard   Specifications
  Material: All optical material
  Clear aperture: 85% of diameter
  Focal length tolerance: +/-2%
  Diameter tolerance: +0.0/-0.10mm  
  Center thickness tolerance:+/-0.1mm
  Centering Tolerance:3 arc min typical
  Surface accuracy: λ/4 @632.8nm
  Surface quality: 60-40


Plano-Concave Lenses

Standard   Specifications
  Material: All optical material
  Clear apertuer:90% of diameter
  Focal length tolerance:+/-2%
  Diameter tolerance:+0.0/-0.10mm  
  Center thickness tolerance:+/-0.1mm   typical
  Surfacae Quality:60-40scratch-dig

 

Bi-Convex Lense

Standard   Specifications
  Material: All optical material
  Clear apertuer: 85% of diameter
  Focal length tolerance:+/-2%
  Diameter tolerance:+0.0/-0.1mm  
  Center thickness tolerance:+/-0.1mm
  Centering Tolerence: 3 arcmin
  Surface Accuracy: λ/4 @546.1nm
  Surfacae Quality:60-40 Design Wavelength:546.1nm

 

Bi-Concave Lenses

Standard   Specifications
  Material: All optical material
  Clear apertuer:90% of diameter
  Focal length tolerance:+/-2%
  Diameter tolerance:+0.0/-0.10mm  
  Center thickness tolerance:+/-0.10mm  
  Surfacae Quality:60-40

 

 

 

Achromatic Double Lenses

Standard   Specifications
  Material: All optical material
  Clear apertuer:90% of diameter
  Focal length tolerance:+/-2%
  Diameter tolerance:+0.0/-0.15mm  
  Center thickness tolerance:+/-0.2mm  
  Surface Quality:60-40

 

 

Cylindrical Lenses

 Square Plano-Convex Cylindrical Lenses

 

Squarer Plano-Concave Cylindrical Lesses



Standard     Specifications

Material    

BK7 ,     fused silica

Surface     Figure

λ     /2@633nm on plano     side

Surface     Quality

60-40    

Dimensional     Tolerance

+     0.0mm, - 0.1mm

Thickness     Tolerance

±     0.2mm

Chamfer    

0.25mm     at 45° typical

Concentricity    

3     minutes

Focal     Length Tolerance

± 1%     typical

Antireflection     Coating

Wavelength     user specified
    R 0.25% for V-type AR coating
    R 0.5% for BBAR coating, per surface.

Clear     Aperture

Exceeds     central 85% of dimension

 



C-Lens

Standard   specifications:
  Lens Material: Glass like Material

Max.Operating   Temperature: 400

Transmission:: >99%(900   to 1700nm)

Hygroscopic   Susceptibility:: None

Polarization   Preservation: >0.99

Acid   and Alkaline Resistance:Excellent

Thermal   Expansion Coefficient:<6x10-6 /

Maximum   Power: >500mW

Surface   Quality:20/10 scratch & dig

coating: R<0.25%@(Design   wavelength)±40nm


 
 


 

 


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