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Aspheric Mirrors > Off Axis Parabolic Mirrors

Introduction

Parabolic mirrors are the most common type of aspherical mirrors used in optical instruments. They are free from spherical aberration and thus focus the parallel beam to a point or point source to infinity. In many optical systems it is not necessary to use aperture that is completely rotationally symmetric. On the other hand in some applications the central part of the mirror obscures the beam path and therefore is a disaster. For such systems off-axis mirrors offer many advantages versus the traditional paraboloids.
 
 

Standard Specifications

  
  

  Description:

Parameter

Description

PFL          

Parent Focal Length(PFL) is the focal length of the parent paraboloid

It defines the shape of the surface as Z=R2/4×PFL (Z is surface sag)                   

SFL           

Slant Focal Length (SFL) is the distance between OAP mechanical center and parabola focus.                                          

OC              

Optical Centerline is the line parallel to parent parabola optical axis and coming through the mechanical center of OAP.           

Y Offset    

(ZR)          

Y Offset is the distance between parent parabola optical axis and optical centerline of the OAP.                                                 

OAD         

Off-axis Distance (OAD) is the distance from parent parabola optical axis to inner edge of OAP.                                              

 

Items

Specifications

Material

Fused Silica

Designed Index

1.46008 ±0.00005

Dimension Tolerance

+0.0/-0.2 mm

Thickness Tolerance

± 0.2 mm

Focal Length (on axis)

± 2%

Flatness

λ/4 at 632.8 nm (Substrates)

Surface Quality

scratch and dig 60-40 (Substrates)

Bevel

0.5 (0/-0.3) mm

Coating

Protective Al Coating

Protective Silver Coating

Protective Gold Coating

Notes:

1. Besides the Fused Silica, BK7 is available on request.

2. Surface quality could reach 40-20.

3. Please show us the size and the coating specification.

 

  
   
 

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