Melles Griot has in-house capabilities to fabricate a wide range of spherical, aspheric and flat surfaces. We have many different types of generating and polishing equipment, including traditional, CNC and diamond turning machines, capable of producing λ/20 P-V optical surfaces in production volumes.
We also use Magneto Rheological Finishing (MRF®) which allows us to produce optical surfaces with industry leading low figure error. This advanced technology works as a post processing step for optics that have been conventionally or CNC polished to provide optical surfaces with irregularities better than λ/60 P-V. Our process minimizes the generation of mid-spatial frequency errors.
While MRF can be used to limit the aberration contribution of individual surfaces, it is also combined with in-house transmitted wavefront metrology to allow for targeted wavefront correction at the system level.
|Fabrication Tolerances||Commercial Grade||Precision Grade||High Precision|
|Centration (edge thickness |
|Clear Aperture (%)||85||90||95|
|Surface Quality (scratch/dig)||60-40||20-10||10-5|
|Polished Surface Roughness (A, RMS)||20||5||2|
|Polished Surface Irregularity |
(waves, P-V @ 633 nm)
|Spherical Radius (fringes)||10||5||3|
|Collaborative Design||High-precision Optical Assembly|
|Design Validation||System Level Testing|
|Advanced Optical Fabrication||Global Sourcing and Customer Support|
|Highest Performance Optical Coatings||Markets and Applications|