Surface Metrology

Single-shot surface qualification

When integrated in a reflection setup, thePhasics SID4 wavefront sensors can perform surface characterization. Kaleo software outputs the 3D surface map and the radius of curvature of convex or concave surfaces, such as lenses, mirrors, or molds. All surface quality parameters defined by the ISO 10110 standard such as surface irregularities, roughness, and waviness are calculated from this measurement. Surface profiles can also be extracted in any direction and results can be compared to the theoretical surface.

  • ▽ Flat and slow surface measurement setup

    Flat and slow surface measurement setups with Phasics SID4

    In order to perform surface measurement, the beam is expanded to be adjusted to the size of the area of interest. The surface under test is imaged onto the SID4 wavefront sensor. First, a reference measurement is performed with a reference flat and the test sample  is aligned and measured. The measured wavefront is twice the topography of the test surface.

  • ▽ Concave surface measurement setup

    Concave surface measurement setups with Phasics SID4

    For concave surface measurement, a condenser is added to the optical setup in order to illuminate the surface under test with the right numerical aperture.                                                                                     

  • ▽ Convex surface measurement setup

    Convex surface measurement setups with Phasics SID4

    The same approach with a condenser is used to qualify convex surfaces.                                                                    

 

Measurement examples

Aspherical surface shape and error to design measured with QWSLI (SID4 wavefront sensor)

Aspherical surface & shape error

Surface topography measured with QWSLI (SID4-HR wavefront sensor)

Flat glass surface topography

Deformable mirror influences functions measurement performed with QWSLI (SID4 wavefront sensor)

Deformable mirror influence functions

Advantages

Complete and accurate

  • Instantaneous complete 3D shape
  • High dynamic range
  • High-resolution map

Ease of use and versatility

  • No CHG or null lens
  • No stitching / scanning
  • Non-contact measurement

Common-path interferometry

  • No reference arm
  • Insensitive to vibrations
  • Easy alignment

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