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Multi-Elemenet Optics-DLB (Achromatic Doublets （φ10 - φ100)
DLB (Achromatic Doublets （φ10 - φ100)
Achromatic doublets are cemented achromats made of two different lenses. (Low dispersion positive from crown glass and high dispersion negative from flint glass). The difference of dispersion and shape of both lenses are designed to minimize the chromatic aberrations in blue (486.1nm), green (546.1nm) and red (656.3nm). Therefore, these lenses are able to support the entire visible wavelength spectrum.
Specification
Attention
▶When a parallel beam is converged and to minimize the spherical aberration, please set the positive part to the side of the incident parallel beam and put the negative part to the side of the focal point.
▶To change the reflective index of a glass according to a wavelength is called “dispersion of the glass” Having a difference in focal length of a lens at each wave length is Chromatic aberration and this is due to dispersion. This can be corrected by combining glasses with low and high dispersions.
▶ Spherical aberration is when a ray enters a lens farther from its optical axis and has a shorter focus than a paraxial focus.
▶Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
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