It is a simple onoff toggle no adjustments are needed. The strehl ratio, chromatic focal shift, and field analysis were carried out for a planoconvex cylindrical lens, an achromatic cylindrical lens, and a cylindricalmirrorfocused scanner. Essentially shows chromatic focal length change with lens ct and lens shape factor. The optical system is out of focus, reducing the sharpness of. Getting started using zemax institute of applied physics. The chromatic focal shift curves simulated by the zemax software are. By modeling the lens in a ray tracing software, such as zemax, code v, or one of. For a doublet consisting of two thin lenses in contact, the abbe number of the lens materials is used to calculate the correct focal length of the lenses to ensure correction of chromatic aberration. Usually 34 lens elements with 3 different glasses are used to achieve this. A type of chromatic aberration, chromatic focal shift describes how different.
Spherochromatism and chromatic focal shift at a double aperture f5. Imaging fundamentals of fourier optics, physical optical image formation, imaging in zemax 9 20. The opticaldigital system, which incorporates a cubic phasemodulation cpm plate in the optical system and postprocessing of the detected image, effectively reduces a systems sensitivity to misfocus in general or. Focal shift super apochromatic correction means that the lens provides correction of chromatic aberrations for 4 selected wavelengths. We present a novel, to our knowledge, opticaldigital method of controlling chromatic aberration. Featuring f1 designs, these lenses have been optimally designed to minimize chromatic and spherical aberration for excellent focused spots at short working distances. The shackhartmann test bed was used to measure the chromatic focal shift cfs. Built on zemax core physics engine design, analyze, and optimize faster, easier and with confidence. While the use of aberration formulas might be effective for some simple optical systems, it has limitations for complex and fast systems. Collimation packages with custom alignment wavelengths, operating temperature ranges. Optical design software from zemax design imaging optics, lighting and illumination systems, and laser systems as the industryleading optical design software, opticstudio is used across a wide variety of industries, from aerospace and astronomy, to automotive, biomedical research, consumer electronics, machine vision, and more. Optical design of beam delivery and beam forming systems. Design of an achromatic, high numerical aperture optical. Zemax brings a new level of productivity to optics simulation software with opticstudio14.
Stepbystep software solutions for removing chromatic aberration. These lenses do a better job of bringing all of the wavelengths of the visible spectrum together at. Focal shift and analysis miscellaneous lateral color. Design a single lens using zemax and show performance using spot diagrams focal ratio f5. Zemax optical design program users guide version 6. Chromatic focal shift of optical system expressed by related.
The chromatic focal shift of the lenslets, for example, can incorrectly contribute to the measured chromatic focal shift of the test lens or test system. Steps for correcting chromatic aberrations in lens design. In darktable this is done with the chromatic aberrations module available in the right pane, part of the correction group. If youd like to skip this article and just download the zemax design zar. For this reason chromatic aberration correction is usually accomplished with real ray tracing. The achromatic hybrid nim lens is modeled and analyzed by the optical design software package, zemax. The simulation has been done by zemax optical design software. Compounding this, chromatic focal shift measurements are inherently challenging to make accurately, since every optical element in the shackhartmann test is refractive.
Thorlabs achromatic doublets are optimized to provide a nearly constant focal length across a broad bandwidth. In order to see the full color correction, switch those wavelengths to 450 nm, 550 nm, and 650 nm all weights 1, and youll see this for the chromatic focal shift plot. The first line of defense against chromatic aberration is at the lens. Brian bauman of lawrence livermore national laboratory for his guidance in the development of this feature. It is used for the design and analysis of both imaging and illumination systems. Two sets of relay lenses expand the beam to fill the back aperture of the objective lens and contribute to the chromatic aberration. If the focal lengths of the two lenses for light at the yellow fraunhofer dline 589. The chromatic focal shift and the transverse ray fun plot are shown in figure 4. This article describes the use of gaussian quadrature sampling for determining the optimal set of wavelengths to use in optimizing an optical system for performance over a broad input spectrum. But, they are so powerful it is easy to be a monkey at a typewriter. Optimization ii systematic methods and optimization process, starting points, optimization in zemax 8 04. Optical glasses and glass researchgate, the professional network for scientists.
Zemax is a company that sells optical design software. General philosophy optical design programs are powerful tools. By studying the chromatic focal shift analytical equation of the optical. This value is verified relative to the first order. Optical performance evaluation and chromatic aberration correction. A type of chromatic aberration, chromatic focal shift describes how different wavelengths focus along different longitudinal positions. Simulation with a raytracing software demonstrates how the focal spot is increased due to the aberrations right column. Based on the zemax model, the chromatic focal shift. They are designed to produce the smallest focused spot size and superior images without decreasing the clear aperture and offer improved chromatic focal shift. Download scientific diagram spherochromatism and chromatic focal shift at. Cassegrain telescope has been design and analysis by using zemax software.
Zemax can be used to maintain the achromatic condition, focal length and add lens thickness. Zemax is used to compute axial color in a singlet axial color defocus versus wavelength. Opticstudio is its flagship product and a commonly used optical design program for microsoft windows. Also the objective function of the optical design is to reduce the aberrations to provide clear image. Ray tracing methods for correcting chromatic aberrations. Illumination introduction in illumination, simple photometry of optical systems, nonsequential. Osa control of chromatic focal shift through wavefront.
The optical design program zemax is used to model and analyze this planoconcave nim lens. A way to correct the chromatic aberration is to use different lenses in one optical sytem. The design of complex and highperformance optical assemblies is greatly simplified by the availability of a wide range of sophisticated software packages, reports the scott partnership. This series of three articles is intended as an introduction to new users on interfacing with opticstudio sequential mode. Opticstudio, then called zemax, was originally written by ken moore and was the first optical design program. The full field of view of the objective lens angle to 0. The goal of most imaging lens designs is to get all the desired wavelengths to focus on the same plane. Opticstudio is the industry standard optical system design software, combining sequential lens design, analysis.
The key supplied with the zemax software is worth the full purchase price of the software. Figure 3 is the plot of an individual eye model where abscissa is the wavelength and the ordinate is the chromatic focal shift. Zemax japan about zemax japans support opticstudio navigating the opticstudio interface. Generation of longitudinal chromatic aberration has been achieved by using two biconvex lenses with focal length of 30 mm and 40 mm and a 40x microscope objective. Zemax customer lightpath is a global leader in optical technologyoffering optics and photonics solutions for the industrial, defense, telecommunications, testing and measurement, and medical industriesand has significant experience on the topic. The zemax optical design program is a comprehensive software tool. The correction of chromatic aberrations is typically performed using aberration formulas or by using real ray tracing. Is different from typical chromatic focal shift since this includes color.
Spacers and focal length extenders modify the field of views or working distances in fixed focal length lenses, whereas shims can be used to precisely control the working distance of. Product engineering teams can share complete design data and analyze performance in a. How aberrations affect machine vision lenses edmund optics. A single optical element has different chromatic focus position for. Chromatic confocal microscopy for multidepth imaging of. Chromatic aberration is radial distortion that depends on wavelength. Optical system design introduction june 15, monday. Using zemax software to model the chromatic dispersion, the optical design was optimized for maximum chromatic shift using commercially available lenses. In many applications of lens design, avoiding chromatic aberrations is a key. Darktable is free and opensource software and i highly recommend it. Zemax is used to confirm the algebraic equation for computing secondary color in a visible achromatic refractive doublet. To introduce the design principles of lens and mirror optical systems and the evaluation of designs using modern computer techniques.
This is a 4 f10 apochromat, athermalized over the 5 to 40 deg. Different types of glasses refract light in different intensities, so if you combine differing glaastypes, you can reduce aberrations. The plot shows the variation in paraxial focus with wavelength. Lens spacers, shims and focal length extenders edmund optics. Design and fabrication of white light confocal microscope. Zemax tutorial 11 secondary color, glass substitution and. The lectures will cover lens design, aberrations, optimization, tolerancing and image quality metrics. This value is verified relative to the first order calculation as shown in optics tutorial 9. Optics optical design of beam delivery and beam forming. Although zemax is easy to use, optical system design is a very broad area of.
Zemax tutorial 9 entering custom glass and axial color youtube. Leading optical product design software for engineering. Zemax tutorial 9 entering custom glass and axial color. Performing the optimization to have zemax perform the. Introduction to zemax optical ray tracing software. Control of chromatic aberration through purely optical means is well known. Achromatic negative index lens with diffractive optics. This is accomplished by utilizing a multielement design to minimize the chromatic aberration of the. The secondary spectrum was corrected well with the help of zemax software. Procaliber lenses are more highly corrected for chromatic aberration.
Fields stand for light sources that can be on or off axis, with different inclinations or angles. Its also a multiconfiguration lens, so toggle between the temperatures using ctrla or shiftctrla. In zemax, the chromatic focal shift plot shows the distance between the focal point of the ray at certain wavelength and that at the primary wavelength with unit of. Steps for correcting chromatic aberrations in lens. This is opened by selecting analysis, then miscellaneous, then chromatic focal shift.
Illumination introduction in illumination, simple photometry of optical systems, nonsequential raytrace, illumination in zemax. Design of spectrometer for highspeed line field optical. The chromatic aberration, the variation in focal length with wavelength, can be seen on the chromatic focal shift plot. Lens spacers, shims and focal length extenders are simple tools a user can easily utilize to achieve these requirements. Zemax, code v, oslo that trace rays through optical systems to determine their performance they use sequential ray tracing to determine optical parameters one can evaluate various performance parameters such as image quality object image stop r 1 r 2 separation thickness. Optimization ii systematic methods and optimization process, starting points, optimization in zemax 8 07. The effect of variation of distance between lenses on longitudinal chromatic aberration was studied. How aberrations affect machine vision lenses vision. Chromatic focal shift a type of chromatic aberration, chromatic focal shift describes how different wavelengths focus along different longitudinal positions. Achromatization, diffractive optics, hybrid optics, zemax.
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