The advantages of aspherical lens in laser application

Aspherical lens has better surface, so it has been widely used in optical instrument, image, optical electronics industry. Examples include digital cameras, CD players, high-end microscopic instruments, lasers, exposure and semiconductor machinery.

(1) In general, because of the symmetry of the spherical surface of the traditional spherical lens, when different wavelengths of light are used, the lens will have a different refractive index, causing chromatic aberration. Aspherical lenses can achieve chromatic aberration correction by designing an asymmetric radius of curvature, so that light of different wavelengths has the same refractive index within the lens, thereby reducing chromatic aberration. 

(2) Correction of image field distortion or distortion. The lens will deform or distort the objects at the edge of the image, affecting the sharpness of the image. Aspherical lens can be designed by the asymmetric curvature radius, so that the light at different positions in the lens has the same refractive index, can better correct the image field deformation or distortion. 

(3) Achieve a larger field of view and higher resolution. Aspherical lenses can be designed to have a larger field of view, so that the coverage of the lens is broader, but also through the image field correction, improve the resolution of the imaging, so as to better meet the needs of applications. 

(4) To achieve a smaller optical system. Due to the symmetry of spherical lens, it is necessary to increase the lens to achieve the quality of imaging, which makes the optical design complicated and the cost increased. Aspherical lenses can be specially designed to achieve the same imaging quality, reduce optical components, and reduce design costs, so that smaller optical systems can be achieved. 

(5) Aspherical lens because of its unique radius of curvature, coupled with the process of manufacturing is more special, can reduce the counterfeit on the market to ensure the quality of the product.