Insert the plastic collimating tool into the focuser like an eyepiece with the bottom end out. For collimating lightto make a conventional lens thinnerworks by refraction and total internal reflectionteeth are on the inside of lensvery efficient for large offaxis angles, no so efficient for small anglestir reflection has no losses if the surface of the facet it perfect. It is not the last word in collimation, and readers are encouraged to pursue the subject in greater depth to learn of more complete methods. Thorlabs offers a large selection of aspheric lenses to choose from. The c171tmdb mounted or 354171b unmounted aspheric lenses have a focal length of 6. Pdf a novel freeform lens design for collimating uv. Solving for the desired focal length of the collimating lens yields. Optical lenses, laser collimating lens, camera lens module. Input slit collimating mirror focusing mirror diffraction. An optical collimator consists of a tube containing a convex lens at one end and an adjustable aperture at the other, the aperture being in the focal plane of the lens. Osa freeform lens design for led collimating illumination.
Freeform surfaces are widely used in imaging systems. If the application requires a high amount of the laser light to be coupled though the system, a lens with a high enough na must be chosen. Design of a fresnel lens an evident disadvantage to using a lens with grooves is the possibility of lost light due to incidence on the draft facet. By selecting the right properties of the lens and focal distance, light can be collimated with high accuracy. Since the source needs to be small, such an optical system cannot produce much optical power.
Freeform lens design for led collimating illumination jinjia chen,1, teyuan wang,1 kuanglung huang,2 teshu liu,1 mingda tsai,1 and chintang lin1 1 department of electrical engineering, national changhua university of education, 2 shida road, changhua 50074, taiwan 2 department of electrooptical and energy engineering, mingdao university, 369 wen hwa road, peetow. Click on document introduction to lens design with practical zemax examples pdf. Mwirlwir collimating lenses have a high numerical aperture for maximum light collection for collimating light from mwir and lwir lasers, including quantum cascade lasers qcl. Furthermore, if a certain beam adjustment must be made, for example, to expand the beam radius of a collimated beam, a twolens system is often used. The collimator design parameters for this tutorial will be the following. To convert divergent beams of light into a parallel beam, a collimating lens is needed. The coluvvis and col90uvvis have a 6 mm diameter lens with a confocal length of 8. This paper presents the design of a collimator lens for use with the lightbrick that uses total internal reflection as well as convex and concave surfaces. The freeform collimating lens suggested in this work is constructed from only four surfaces.
Solution of exercises lecture optical design with zemax for phd. It provides adjustable focusing in a system that otherwise acts as an immersions lens 2. To verify the practical performance of the lens, a prototype of the collimator lens is also made, and an optical efficiency of 90. Pdf on mar 1, 2019, himanshu kumar and others published a novel freeform lens design for collimating uv light emitted from a led with large divergent angle. As regards connectorization, collimating or focusing lens systems developed by idil fibres optiques offer two types of inputs, namely pigtails or connectorsadapters. Isaac newton the telescope most likely to need collimation is the newtonian reflector which includes dobsonians because it is most. Collimating and focusing a laser diode is perhaps the most critical prerequisite in any laser diode application. The aspheric design enables a single lens to replace complex multiple component optical system. This occur because the light source is not placed in the back focal length bfl of the lens. Input slit collimating lens focusing lens diffraction grating detector array on the following pages are shown two common spectrometer geometries. The aspheric lens with a focal length that is closest to 16 mm has a focal length of 15.
Collimating lens, collimation optics, laser collimating lens. Collimating lenses are designed for various applications covering from the uv to visible to long wave infrared range. Design of collimating system for led source 20 shen. The lightbrick is a light collector for the natural light illumination system. A freeform collimator lens design for the natural light. Optical lens design and lens module assembly for odmoem. The fiber launch platforms are ideal for coupling a free space laser into a single mode, multimode, or polarizationmaintaining fiber. Pdf freeform lens design for led collimating illumination. Collimating the light source in the simulation window you will see that light is not fully collimated.
A novel freeform lens design for collimating uv light emitted from a led with large divergent angle article pdf available in optik international journal for light and electron optics 181. This is a basic tutorial on how to use lenses in order to focus. While the characteristics of a laser diode might be ideal for your application, the laser diode must be matched with the appropriate optics to create a useable beam. Generally, the projection distance is assumed to be more than 100 m, and the light beam to have negligible divergence. The collimating lens has a high light energy utilization and a good collimating performance. The collimator lens is constructed using freeform surfaces which can be calculated through geometricoptics. Collimation coupling fiberports can be used to provide a stable platform for coupling light into and out of fcpc, fcapc, or sma terminated fiber with five or six directional adjustments. In addition, simple techniques to aid in the design of collimating reflectors, collimating lenses, and pillow lenses are discussed. In order to improve collimation you can copy the bfl from the lens property windows and change the zaxis position of the lens to match this number. One lens with a negative focal length and the other with a positive one creates a setup to collimate and expand or shrink the beam. We will use the lumileds rebel as the source and acrylic as the lens material. Freeform lens design for led collimating illumination.
The collimating lenses of the reflector and transmission types are used in the beam transmission system to maintain the quasistraightness of the beam between the laser resonator and the focusing optical element. When the size of the led chip is 1 mm1 mm, the energy utilization rate of the collimating lens is more than 95%, and most lighting area radii are no more than 8 m when the. Design of led collimating optical system springerlink. This paper presents a design method of collimating optical system. The algorithm is designed considering a consistent combination of different surfaces, so the light rays reaching the fresnel surface. The collimation system is simulated and optimized in the lighttools software. A novel freeform lens design for collimating uv light emitted. Avantes collimating lenses are optimized for the uvvisnir range 2002500 nm and have anodized aluminum housings. Dec 31, 20 the collimating lens has a high light energy utilization and a good collimating performance. The performance of the optical system can be improved. But the not all the lens designs are simple lenses, we will look at newer and important lens design forms as well. The ideal case is a more complex shape that is typically defined using a radius of curvature, a parabolic term conic, and several high order coefficients. The present invention is a collimating lens, comprising a lens having at least one aspherical surface, wherein the collimating lens is used in a wavelength range of 1.
The method design and optical evaluation are supported by the standard code simion. When selecting a lens to collimate the laser, first consider the na of the lens. The method turns into a tool to design an es einzel lens for wide applications. A tutorial for designing fundamental imaging systems koichi taniguchi opti 521 distance learning college of optical science university of arizona november 2009,, abstract this tutorial shows what to do when we design optomechanical system for imaging system. First, collimate the secondary mirror with a collimation. A freeform collimating lens is designed to project light rays emitted from an led light source to a far target plane. A novel lens profile is synthesized with an objective of having an improved collimation using three freeform surfaces and one total internal reflection surface. The collimating lens is a common convex lens, where the diverging light enters, and the parallel light emits, and this convex lens acts as a straight line. To narrow can mean either to cause the directions of motion to become more aligned in a specific direction i.
At shanghai optics, we design and manufacture many different types of standard and custom collimating lenses for customers around the world. The method is derived from a basic geometricoptics analysis and construction approach. The lens is designed with a pointsource assumption to form compact collimators. The algorithm is designed considering a consistent combination of different surfaces, so the light rays reaching the fresnel surface through refraction and. Fiberports can be used to provide a stable platform for coupling light into and out of fcpc, fcapc, or sma terminated fiber with five or six directional adjustments. The method is derived from a basic geometricoptics.
In general, designs that use collimating secondary optics are more efficient, and produce a more uniform lit appearance. The basic lens design forms are in here, and we can take a deep look into the development of lens design. They show good performance, quality, reliability and low deformation for performance quality, reliability and high temperature priority. The lens mirror with the appropriate focal length will be selected according to the required girdle radius of the small. The collimated beam is now focussed into a fiber with numerical aperture of na. By using this method, a highly collimating lens with led chip size of 1. Collimating or focusing lens system idil fibres optiques. We have a multi talented engineering team comprising optical, mechanical, electronics, materials and process engineers. Lens design methodology contains of two procedures, viz. You can see how a new design can evolve around a simple starting point idea or structure. Also, the figures defines the key design parameters of a spectrometer. These two types of rotationally symmetric led collimating lenses can be straightforwardly designed without the use of iterative algorithms. Collimating lenses are used to convert divergent light beams into parallel beams.
Radiation entering the aperture leaves the collimator as a parallel beam, so that the image can be viewed without parallax the collimator may be a telescope with an aperture at the principal focal length of the. As a comparison, we briefly present the traditional method for collimating a ritchey. Sep 01, 2010 a freeform collimating lens is designed to project light rays emitted from an led light source to a far target plane. A cross section of an led signal lamp with a fresnel lens and a pillow lens is shown in figure 5. This work brings out a design of freeform collimating lens for modulating ultraviolet light emitted from an ultraviolet light emitting diode uvled. The ubenches are based on the stable fiberbench platform with a fiberport. For this application the ideal lens is a b arcoated molded glass aspheric lens with focal length near 5. Iarex group has high level manufacturing capacities for glass optics, plastic optics, hybrid optics, fiber optics, coatings and integration at our facilities. A collimator is a device which narrows a beam of particles or waves. A primer on collimation of newtonian telescopes this brief article is intended to help the new owner of a newtonian telescope to learn adjust his instrument to produce quality images. Jan 21, 2018 this paper presents a design method of collimating optical system. Pdf on mar 1, 2019, himanshu kumar and others published a novel freeform lens design for collimating uv light emitted from a led with large divergent angle find, read and cite all the research. Pdf this paper presents the design of an efficient collimating optical system for an extended light source, namely a highbrightness high.
Note that this tutorial uses millimeters as the units. Lens cap once you are ready to collimate, look into rear opening of the tube. We present a novel freeform lens design method for application to lightemitting diode collimating illumination. A novel freeform lens design for collimating uv light. Pdf design and optimization of a collimating optical system for. For a refractive collimator this means that the optical design should be achromatic or apochromatic over the desired wavelength range. Optical design using fresnel lenses basic principles and some practical examples the fresnel lens can be used in a wide variety of applications. Secondary optics design considerations for superflux. The distance between the lens and the tip of the connector can be adjusted by moving the inner connector ferrule in the lens housing. Prototyping illumination systems with stock optical. Simple analytical method to design electrostatic einzel lens. In fact, in many cases just a single aspheric lens can take the place of several conventional spherical lenses, leading to a lighter, more compact, less expensive, and better performing optical system. A collimating lens system is typically made up of a tube with one or more lenses.
Pdf a novel freeform lens design for collimating uv light. This lens also has a clear aperture that is larger than the. Freeform lens design for led collimating illumination optimesa. The collimator should be well corrected over the wavelength range of the optical system under test. The na of a lens is a measure of the maximum amount of divergence that the lens can capture from the laser. In this work, we propose a design method of composite freeform collimating lenses that integrates freeform reflection, refraction, and fresnel surfaces to realize highly collimated and uniformed light output in a single lens element. Advanced tutorial designing a collimator for an led source. Thorlabs offers a large selection of mounted and unmounted aspheric lenses to choose from. Basic principles about designing paraxial systems are introduced. This kind of setup is known as a threeaperture immersion lens or zoom lens. Freeform lens design for led collimating illumination jinjia chen,1, teyuan wang,1 kuanglung huang,2 teshu liu,1 mingda tsai,1 and chintang lin1 1 department of electrical engineering, national changhua university of education, 2 shida road, changhua 50074, taiwan 2 department of electrooptical and energy engineering, mingdao university, 369 wen hwa.
The reflection type collimating lens is used in a copper full mirror, while the collimating lens of. Pdf on mar 1, 2019, himanshu kumar and others published a novel freeform lens design for collimating uv light emitted from a led with. Pensack with illustrationspictures courtesy of jim fly and jason khadder if i have seen further it is by standing on the shoulders of giants. A tutorial for designing fundamental imaging systems. Freeform surface design for a lightemitting diodebased.
Design prototypes high volume lightpaths inhouse optical design staff can design lens or codesign with customer design package goes through customer approval process vertically integrated for raw materials and tooling fabrication delivery of prototypes in as little as 4 weeks from beginning of design. And this is all human based lens design where the fun part, and most important part, comes before we do any computer optimization. Quite frequently the most popular way to focus a laser diode beam is to use a two lens system where one lens collimates the highly divergent beam and the second lens focusses it. The larger the focal length of this lens, the larger the beam diameter will be after collimation. Conversely, a point source at the focus of a parabolic mirror will produce a beam of collimated light creating a collimator. Design of led collimator for uniform illumination using two freeform. Osa design of uniformly collimating lightemitting diode. Determine the strehl ratio and compare the estimated and the exact value. Led has the characteristics of small size and long life. Secondary optics design considerations for superflux leds. The uvvisnir range collimating lenses have a twopart housing of stainless steel. In most imaging system designs, development efforts focus on the imaging optics. A perfect parabolic mirror will bring parallel rays to a focus at a single point. A 100 mm clear aperture collimator would be suitable for testing this lens.
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