Optical Achromatic Lenses(Doublets)

Optical Achromatic Lenses(Doublets)
*Lenses have many applications in range from the simple collection of the scanning of laser beams to precise imaging and image transferring. Lenses are classified as single, cylindrical and achromatic lenses according to the different applications. Our company provides these lenses with the material of optical glasses, crown glass and Flint glass, fused silica, sapphire, silicon and germanium. Special focusing systems are able to be designed by engineers upon request.

*Achromatic (Doublets)Lenses Achromat consists of a positive low-index Crown Glass lens element cemented to a negative high-index Flint Glass lens element. The elements are chosen so as to cancel chromatic aberration at two well-separated wavelengths, usually in the blue and red region of the spectrum. Focal length is constant at those two wavelengths and focal length shifts are virtually eliminated across the visible wavelengths. One frequent use is to achieve diffraction limited focusing of a laser beam. Negative Achromat is typically used when there is a need to eliminate chromatic aberration. In addition to reducing chromatic aberration at the design wavelengths, spherical aberration and coma are greatly reduced.

*Specifications:
Material: Grade A optical glass or Fused Silica
Dimension Tolerance: +0.0, -0.1mm
Center Thickness Tolerance: ±0.1mm
Paraxial Focal Length: ±2%
Surface quality: 60/40
Clear Aperture: >85%
Surface Figure: λ/4 @633nm
Centration: 3 arc minutes
Bevel: <0.25mm×45°
Coating: Upon requirement