Cemented Lens GL31-005-010-VIS

In the 21st century, cemented lenses face new opportunities and challenges. Advancing optics demands higher performance: premium photographic lenses require greater resolution, lower dispersion, and better antireflection. Micro/nanotechnology also demands miniaturization/integration, prompting research into smaller, higher-performance cemented lenses for micro/nano-optical systems. Cemented lenses, also called achromatic lenses, are widely used optics combining two or more elements of different optical properties through special bonding. Their materials' complementary advantages achieve performance difficult with singlets. Common forms include biconvex, biconcave, plano-convex, and plano-concave types for different designs. Materials include optical glasses of differing index/dispersion: crown glass has relatively low index/dispersion, while flint has higher values. Cementing these corrects chromatic aberration. Special crystals such as quartz and IR materials including CaF₂, ZnSe, silicon, and germanium meet specialty needs. Manufacturing requires cutting, grinding, and polishing blanks to the required curvature/figure, followed by critical bonding with specialized optical adhesive. Temperature, pressure, and duration must be strictly controlled for quality/stability, followed by optical inspection. The most common methods described are adhesive cementing and optical contacting. Adhesive cementing joins two or more lenses, prisms, or mirrors into one optic. Adhesive thickness/uniformity must be controlled, and transparency, low scattering/absorption, bond strength, and weather resistance matter. Optical contacting relies on molecular attraction between polished surfaces. It requires high figure accuracy and is harder to process, but introduces no intermediate medium, leaving optical properties unchanged with little deformation and good cold/heat resistance. It suits large apertures and systems with many parts. Applications/development: researchers explore lower-dispersion, higher-index materials and stronger, more durable bonding to improve performance/stability. Broader future applications are expected to contribute to optical technology. Principles/advantages: refraction and dispersion underpin design. Light refracts differently in materials of different indices, while wavelength-dependent index causes dispersion. Combining elements of different indices/dispersion corrects aberrations and chromatic errors. Spherical aberration focuses rays at different heights differently because of spherical surfaces. Selecting curvatures/indices can bring them to the same focus. Oblique-ray coma is also reduced by optimizing combinations. Chromatic correction is especially significant: different wavelengths focus differently, as red/blue in singlets can create colored image edges. Cemented elements with different dispersions bring wavelengths as close as possible to one focus. Advantages include improved image quality in photography, microscopes, and telescopes, with less aberration and clearer, sharper, more accurate colors. Combining multiple functions into one element reduces lens count, design complexity, and cost compared with multiple singlets. Tight bonding stabilizes relative positions against external influences for reliable long-term performance. Premium cameras use them for excellent images; research microscopes/telescopes gain resolution and observation accuracy for studying microscopic structures and the universe. Continued optical development is expected to broaden their applications and support many fields. Note: the source says the preceding table shows only some aspheric sizes; inquire for others. Custom sizes/coatings are available.

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