Ouir Visible Achromatic Doublet Lenses feature minimized spherical aberration and coma at infinite conjugates, yielding minimal focus spot size. Unlike singlet lenses, achromatics have constant focal length independent of aperature and operating wavelength, and have superior off-axis performance.
- Significantly better optical performance than singlet lenses
- Nearly constant focal length across the visible spectrum
- Far superior off-axis performance
- Multi-layer or single-layer AR coatings
- Diameters and focal lengths interchange with our singlet lenses
- Ideal for general purpose benchtop prototyping
Newport's visible achromatic doublet lenses are design around the following visible wavelengths 486.1, 546.1, and 656.3 nm.
Steinheil Triplet Lenses
Our Steinheil achromatic triplets are optimized for finite conjugate 1:1 imaging. Formed using two identical negative meniscus lenses cemented to a biconvex lens. These lenses are diffraction limited at 488, 514.5, and 632.8 nm.
Superior Performance in Monochromatic Applications
Achromats are superior to singlet lenses for monochromatic applications at any visible wavelength. Negative achromatic lenses are used primarily to extend focal lengths, which is often combined with positive achromatic mirror systems and imaging lenses. Generally a diffraction limited spot may be achieved when using a monochromatic source such as laser.
Visible achromats are still usable in the IR, although they are not optimized. An achromat will not be diffraction limited at 1064 nm but performance will still be superior to a singlet lens. At 1064 nm, the focal length of a typical achromat increases by approximately 0.75%. Choosing these optics for image relay or optical processing applications will be more desirable than single element lenses.
Magnesium Fluoride Antireflection Coating
Our single layer Magnesium Fluoride AR coating reduces surface reflections across the visible spectrum. Average reflectance compared to bare glass is reduced from over 4% to less than 1.5%.
Broadband Visible Antireflection Coating
Our AR.14 broadband multilayer antireflection coating markedly improves the transmission efficiency of these lenses by reducing surface reflections over a 430-700 nm wavelength range. The AR coating performs effectively for multiple visible wavelengths and tunable lasers eliminating the need for several sets of optics.