OFF AXIS PARABOLIC MIRRORS
(astro and large sizes)

(other type of optics - look here)

What's it off axis parabolic mirrors in "standard schemes"?

Off Axis Parabolic (hereinafter - OAP) mirrors is part of the surface of paraboloid of revolution.
In standard schemes, the Angle Of Incidence (AOI) of radiation on the mirror is small (5-20 degrees), 
and the mirror itself is accordingly located close from the vertex of the parent parabola (see figure below).

                

 

How to use OAP mirrors usually in standard schemes?

OAP mirrors in standard schemes are often used when customer needs to obtain collimated beam from point source 

or inverse task - from collimated beam to obtain minimal focal point size.
 

What are the advantages and disadvantages of OAP mirrors?

The advantage of OAP mirrors is complete absence of spherical aberrations and, accordingly,
the possibility of obtaining a diffraction-limited spot (or "ideal" paralell beam) in any configuration.

The disadvantage of OAP mirrors is higher cost and longer delivery terms.

 

What's the "most important thing" in a mirror ("mirror quality")?

Usually, it is very important for the customer
how small a spot in the image plane can be formed by the mirror.
Even if task is inverse (i.e. - "ideal" collimated output beam),
this parameter allows you to estimate important data about output beam divergence.

Also, in some tasks the customer is often interested in the possibility of
obtaining an "ideally flat wavefront" in a collimated beam obtained after reflection from a mirror. 
Be sure to specify whether you need this in your request for the cost of the mirror,
as this can significantly affect the price of the mirror.

  

What determines the spot size in the image plane?

The spot size in the image plane for OAP mirror depends on tolerance of the mirror surface shape manufacturing and 
diffraction limitations at the operating wavelength.
The general principle is that the closer the spot size to the diffraction limit, the more expensive the mirror is.

 

 

What are the minimal mirror parameters do you need to know to order?

You need for Your working spectral range to choose:

A). Effective Focal Length, Off Axis Angle and mirror diameter (see the picture above);;
B). desired focal spot diameter or/and surface figure tolerance 
C). send us your chosen five-six parameters by email to quote@precise-mirrors.com.

You may send your request in any form, 
but to speed up the process of preparing a quote, it is better to fill out a special "request form".

You may send additional data for the mirror as additional files in attachment to Your request.

Do you need something else?

Then please check out our standard offer:

Just describe the optical product You need or Your optical task and
send us an inquiry to quote@precise-mirrors.com