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                Aspherical Lenses

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                Aspherical Lenses

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                Aspheric lenses have its advantages in a range of applications where eliminated spherical aberration or (and) single element design is required. CASTECH offers CNC precision-polished aspherical and acylindrical lenses, with or without anti-reflection (AR) coatings. Our CNC polished aspheric lenses are iteratively ground and polished by a software supported computer-controlled processing center to provide better controlled surface quality, irregularity and focal length deviation.

                 

                •  Material from DUV to IR 

                •  Custom dimension and shapes

                • ?????? ?Diameter from 5 to 200 mm

                • ?????? ?Clear aperture: Central 90% of diameter

                • ??????? Irregularity : λ/10@632.8nm

                • ?????? ?Surface quality: 20-10 S/D

                • ?????? ?Centration: 3′

                • ?????? ?Standard and custom coating options available 

                • ?????? ?High laser damage threshold

                 

                Metrology 
                CASTECH employs rigorous verification procedure to guaranty the high performance of our each aspheric lens. A Form Talysurf PGI profilometer allows contact measurement in grinding process while Taylor Hobson LuphoScan 260 non-contact 3D optical surface profilometer performs ultra precision optical surfaces form measurement in polishing process.

                 

                Taylor Hobson Form Talysurf PGI

                Measure range: from 0.1 to 200 mm

                Resolution ratio: 0.8nm

                Taylor Hobson LuphoScan 260 for irregularity measurement

                Measure range: from 5 to 260 mm

                High surface accuracy: ±50nm

                   
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