Apochromat

About: Apochromat is a research topic. Over the lifetime, 642 publications have been published within this topic receiving 7934 citations.

Commercial applications of liquid optical elements

Abstract: In this paper, we report on our work at Lockheed in designing, fabricating, and testing lenses using liquid optical elements to achieve apochromatic color correction without using abnormally dispersive optical glasses and/or calcium fluoride. We have found that designs using liquid optical elements have equivalent or superior optical performance and a cost savings for the lens assembly between 3:1 and 10:1, depending on the diameter. We have also developed designs with apochromatic color correction using plastic and liquid optical elements, a procedure which greatly reduces the weight of the lens as well as its cost. The principle is simple: we eliminate expensive abnormally dispersive glasses and crystals and replace them with inexpensive abnormally dispersive liquids. Designs we have developed include photographic objectives, telescope objectives, and lenses for use in the ultraviolet and infrared spectral regions. An apochromatic telescope objective has been put into production under license from Lockheed and is now available commercially. This paper includes specific design examples.

Imaging of Extended Objects Using an Off-axis Holographic Lens: Effect of Third-order Spherical aberration and Coma

Abstract: The aim of this paper is to evaluate the performance of an off-axis holographic lens afflicted with third-order spherical aberration and coma using a numerical ray-tracing procedure. The light intensity distribution in the aberration spot observed at the Gaussian image plane has been evaluated for different amounts of coma and for a fixed value of spherical aberration. The images of both an extended coherent and an incoherent edge as well as bar objects have been computed and the results compared with the aberration-free case. All the results are illustrated in graphical form.

Spherical aberration compensation by wavelength

Abstract: A method for minimizing spherical aberration in an optical read/write drive caused by variances in lens thickness and laser wavelength. The method provides an economic solution that pairs objective lenses with laser diodes such that the spherical aberration caused by the objective lens is offset by the spherical aberration caused by the laser wavelength, thereby minimizing or completely canceling the overall spherical aberration.

Achromatic aberration corrections with only one glass

Abstract: It is well known and described in any geometrical optics textbook that the axial as well as the magnification chromatic aberration may be corrected in a system formed by a pair of thin lenses separated by a certain distance, using only one type of glass. However, it is not so well known that these aberrations may be also corrected in a single thick lens.

Apochromatic optical system and application for 1-2.5 [mu]m short infrared waveband

Abstract: The invention discloses an apochromatic optical system and application for the 1-2.5 [mu]m short infrared waveband. The optical system is formed by a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a detector window 6 and a mirror surface 7 from the object side to the image side sequentially. The front surface of the first lens 1 is an aperture diaphragm of the optical system. A beam from the object side passes through the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the detector window 6 to generate an image on the mirror surface 7. The optical system has a simple and compact structure, is easy to achieve processing, mounting and adjusting, and only adopts two materials, BAF2 and SF6, which both are of spherical surface types and achieve the effect of an apochromatic design.