Select achromatic lens:
Achromatic lenses are a good choice for any demanding optical application because they provide substantially better performance than spherical single lenses. Achromatic bicolonized lenses are sufficient for most applications of infinite conjugation, and bicolonized lens pairs are ideal for finite conjugation.
However, the adhesives used in these optical elements reduce their damage threshold and limit their availability in high-power systems. Air-spaced binocular lenses are ideal for high-power applications because they have a larger damage threshold than achromatic gluing lenses. In addition, air-spaced bifocals have two more design variables than bifocals because the inner surfaces of the lenses do not need to have the same curvature. These additional variables are that the air-space binocular lens far outperforms the bifocal lens in transmission wavefront error, spot size and aberration. However, spatially spaced bifocals are also more expensive than bifocals.
Achromatic triplet lenses can be designed for finite and infinite conjugate ratios. In the middle of these triads is a low refractive index optical element glued between two identical high refractive index external optical elements. They can correct axial chromatic aberration and transverse chromatic aberration, and their symmetrical design has better performance than glued bifocals.
Double adhesive lens:
Achromatic binocular lenses have more advantages than simple single lenses. They include reduced chromatic aberration, improved off-axis performance, and smaller focal spots. These binaries have a positive focal length and are optimized for wireless conjugate ratio.
Air space binocular lens:
Air-space binaries perform better than bifigalens because their lenses are separated. These optical elements are ideal for high-power applications because they have a larger damage threshold than bifocal lenses. These binaries have a positive focal length and are optimized for infinite conjugate ratios.
2. A binary lens pair:
Achromatic lens pairs have the advantages of achromatic lenses and are optimized for finite conjugate ratios. These lens pairs are ideal for image relay and amplification systems.
Achromatic triplet lens:
Achromatic triad lens has better performance than achromatic diad lens. An achromatic triad is a simple lens that corrects all major chromatic aberrations. Steinheil triad lenses are optimized for finite conjugate ratios, while Hasting triad lenses are optimized for infinite conjugate ratios.