PAC076 Achromatic Triplet Lens - Newport

The PAC076 Visible Achromatic Triplet Lens is a 400 to 700 nm antireflection coated, 1.5 inch (38.1 mm) diameter, N-BaSF2, N-SF4, and N-BaSF2 precision achromatic triplet lens with an effective focal length of 125 mm. 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. This achromat is computer designed to effectively minimize spherical aberration and coma when operating at infinite conjugate ratio, yielding smaller focused spot sizes. Unlike singlet lenses, this results in a constant focal length independent of aperture and far better off-axis performance. Achromats are superior to singlet lenses for monochromatic applications at any visible wavelength.

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Achromatic Lens Design

An Achromat, or Achromatic lens, is usually made up of multiple optical elements, which can be air-spaced or cemented together. These typically alternate a positive lens of low index material, such as crown glass, and a negative lens of high index material, such as flint glass. The elements are selected and optimized so that dispersion in the positive element is corrected by the negative element, resulting in minimized chromatic aberration at two well-separated wavelengths. Achromats offer a nearly constant focal length across the visible spectrum, providing superior off-axis performance. Doublet lenses offer users many more design options than singlet lenses, which allows for superior performance in visual imaging and laser beam manipulation applications. Our lenses are computer designed, minimizing aberrations and providing a smaller focused spot size. They are offered with multi-layer or single-layer AR coatings. Standard diameters and focal lengths may be interchanged with our singlet lenses. Further, achromats are available in a wide variety of configurations, including positive, negative, triplet, and aspherized. These lenses are produced as doublets or triplets (three elements). The collimated beam should enter or depart from the surface (R1 in drawing) with higher curvature (smaller radius) for optimized performance.

MgF2 Visible Antireflection Coating

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Our single layer Magnesium Fluoride visible AR coating is the most common choice that offers extremely broad wavelength range at a reasonable price. It is standard on achromats and optional on our N-BK7 plano-convex spherical lenses and cylindrical lenses. Comparing to the uncoated surface, the MgF2 provides a significant improvement by reducing the reflectance to less than 1.5%. It works extremely well over a wide range of wavelengths (400 nm to 700 nm) at angles of incidence less than 15 degrees.

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.

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JCB,

What makes it high end is that it is optimized to the point where it can no longer be improved without making the system more complex by adding more elements or by adding aspheric surfaces. This lens if built to spec would outperform any four element system that you could put together without going through the same computer optimization. In years past it took engineers months doing hundreds of calculations to approach a design like this but a computer can do millions of calculations in only a second or two.

We can also do a computer optimization for a four element lens design also. In fact by modifing this design by making the final lens into a cemented doublet we can make a tessar lens with somewhat better performance.

What I am saying is that using trial and error by mixing four lenses together is realistically going to be very difficult because you don't have enough lens values or time to look at every combination. Granted you could build the lens with stock lenses but it would perform lower than an optimized one of simpler design.

So we have the option of building a non optimized lens out of stock components or of starting with an optimized design and perhaps trying to find stock lenses for a couple of the lenses and leave one lens variable open for a custom made lens. Trying to optimize the design that way.

If you have a way to communicate with me your lens configuration I will model it and we will see how good it is. Perhaps it can be optimized with only one custom lens or something.

Hezz