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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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