Juncheng
Changchun Juncheng Optical Instrument Co.,ltd.
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Jessie:Jessie@ccjcoptics.com
Bob:bob@ccjcoptics.com
Inspection

What is an optic surface figure?

The surface figure, or surface quality orsurface cosmetics all refer to the deviation between an actual optic andits ideal surface. There are basically two set of information that are commonlygiven by manufacturers: the surface flatness and what is referred to as"scratch-dig".


Why is it important?

Well, an optic with a bad rating on surfaceflatness will introduce some wavefront distortions, which are responsible for aberrations and badquality focus. Aberrated wavefront leads to poor ratio (ratio of theobserved intensity at the image plane compared to the theoretical maximumintensity of a perfect optical system), so poor optics makes one loosevaluable optical power at focus. Plus scratches or digs on an opticcreate diffraction and stray light, which no one wants either.



Scratch-dig

SCRATCH-DIG

QUALITY

APPLICATIONS

60-40

Very low

Commercial grade, non-critical  applications. Also used in low power laser and imaging applications where  scattered light is not as critical as costs.

40-20

Low

Standard scientific research applications,  for laser or imaging applications with focused beam that tolerate little  scattered light.

20-10

Moderate

Laser mirrors and extra-cavity optics. For  laser and imaging application with focused beams where minimising scattered  light is important. This is the best quality offered by some manufacturer.

10-5

High

Intra-cavity laser optics, high power  applications.


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