In this section this effect is made clear by considering the transmission efficiency for both components of polarization of a simple doubleprism beam expander, as illustrated in fig. With newports optical components, this video shows the process of building a galilean and a. It is designed for use with co2 lasers having up to 12mm beam diameter and w cw power. The use of this type of beam expander can be found in such applications as. These galilean beam expanders have threaded input and output apertures, which allow additional lenses and filters to be installed easily along the optical axis of the beam expander. Before we get into the ins and outs of correct beam expander usage, youve got to know when you need them in the first place. This creates a spot of concentrated energy within the beam expander which heats the air within the system and deflects light from its optical path. High cw damage threshold makes this ideal for cw laser processing applications. These systems are suited for typical medium power levels of up to. Laser beam expanders are designed to either decrease the laser s beam spot size at large distances or produce a larger diameter collimated laser beam. Using an adjustment screw, the distance between the lenses can be changed to compensate for the divergence of the incident beam. We shall assess how well that can be achieved with two spherical mirrors. An intelligent assembly concept saves timeconsuming adjustments and ensures precision and flexibility. Both the object and the image are located at infinity, which means that the input and output beams are collimated afocal system.
This galilean 30x beam expanders incorporate the highly regarded tropel optical designs with improved adjustability and mounting. In size restricted applications, it is desirable to use a compact beam expander but in most cases a compact beam expander is only suitable for small diameter beams. July 16, 2014 by ophirblog before i get into the ins and outs of correct beam expander usage, youve got to know when you need them in the first place. The input of each beam expander has internal sm05 0. Beam expanders consist of transmissive configurations, with galilean or keplerian designs, and reflective configurations, which use a series of mirrors, similar to microscope designs. Obviously, a beam can be collimated over a certain length only if its beam waist is large enough. Similarly, they can be used in reverse to provide beam compression. Beam expansion and beam shaping at the next level asphericon. Spatial filter beam expander provides uniform energy distribution at the work surface by removing unwanted energy form outer regions of the beam profile. Jul 16, 2014 using a laser beam expander how and when.
Standa diffraction limited galilean type laser beam expanders offer variable magnification of 2x12x other ranges also available with adjustable focus to correct laser beam divergence. Beam expander is an optical component used in laser industry for expansion of beam. Thorlabs galilean type beam expanders, which are available in both fixed and variablemagnification options, are offered for use in the uv, visible, near infrared, and midinfrared spectral ranges. Beam expander focusing aleksandar marincic, adel rajhi elektrotehnicki fakultet, beograd 1. Laser beam expanders beam expanders optical assemblies. Beam expanders consist of two lenses that are built according to the galileo principle and therefore do not generate an intermediate focus. Note on achromatic multipleprism beam expanders pdf. The t8x laser beam expander provides a low cost means of focusing and shaping laser beams with a high degree of accuracy. Depending on customer needs and application we can customize beam expander lenses to compensate aberrations in region of 2 m focus point or for i.
Sorls coar series laser beam expanders employ an offaxis, afocal dallkirkham design to provide accurate, unobstructed and achromatic expansion of any collimated input source. Beam expanders design subject to change upon request. A galilean configuration, entrance fused silica optics and airspaced optics with ar coatings can. In some lidar applications customers may wish to have a focusing system. Build your beam expander from aos standard mount products or ask us to produce a custom product to your requirements. Altechna offers variable beam expanders with high pointing stability and high lidt ar coatings that minimize ghost reflections. Variable beam expanders altechna custom laser optics. Optical performance is optimized first with inhouse design and also with system test metrology.
All the fixed expanders are the same size so if your source beam diameter changes it is a simple matter to swap an expander with a different power. Design of achromatic multipleprism beam expanders eq. Design and advancement status of the beam expander. It is not possible to obtain a decreased beam diameter by using the beam expander on the opposite side. Rp photonics encyclopedia beam expanders, telescopes.
This can be a useful addition to other attenuation methods. Edmund optics has introduced its new zoom beam expander. The collimation ratio of the beam expander for a gaussian beam is as follows 4 where t1. Download free adobe pdf reader and solidworks viewer on the left. Astronomy, iterferometry, intracavity beam expansion and extracavity beam expansion, and microscopy. Fiber laser components fiber laser system components. Motorized beam expander product information optical. Reflective beam expanders are modified cassegrain and gregorian mirror systems.
In a laser beam expander design, the placement of the objective and image lenses is reversed. Beam expanders have two main purposes in the laser industry. Beam expanders for laser material processing jenoptik. Optical surfaces laser beam expanders incorporate offaxis mirrors which provide an unobstructed output and highly efficient transmission. Together with 4d technology, harris has developed a beam expander line that fully integrates with multiple 4d interferometer configurations, including 4ds instantaneous phase. The instrument is used in a fashion similar to using a telescope and produces straight line telescopic rays or prismatic rays, such as the rays one can see as light is reflected off the facets of a crystal. Edmund optics uses cookies to optimize and enhance the features and content on our website. A beam expander can enlarge an input beam by the factor m, but it. Simple beam expanders, sometimes referred to as telescopes, in their most basic forms generally consist of two lenses. Special optics high power beam expanders are specifically designed with a convex first surface, which diverges the return reflection from the first lens surface and prevents any damage backstream of the beam expander.
Bsl beam expanders introduction the bsl17 series are a set of compact and economical beamexpanders for use with small or medium size co2 lasers, such as synrad, and coherent diamond lasers. Ccd laser beam profiler with 4x beam expander attached. It provides variable magnification of 1x to 3x and 2x to 8x with adjustable focus to correct for laserbeam divergence. Spatial filter beam expander laser beam enhancement. Simply transform collimated gaussian laser beams into collimated and focused tophat beams and take advantage of the easy handling. In its simplest form, the galilean type consists of a. Assume that the incident light is collimated and you want the resulting light from your beam expander to also be collimated. Laser beam expanders designed to use with high powered lasers that are made of lenses attached together without using glue airgap. As an example, figure 3 shows the evolution of beam radius in the same beam expander is considered in figure 1, but with a five times smaller initial beam radius. Variable beam expanders are ideal for systems where different magnifications and precise control of laser beam divergence are required. Gui for special optics motorized zoom beam expander 56c301x4x. In such type beam expander aberrations can be totally compensated only in one point.
Please contact us at 7323216915 or contact a representative to learn more about product availability, lead time, pricing and capabilities. Most fiber laser system manufacturers insert the fiber laser output device into the optical scanhead which makes for a smaller and cheaper unit but this is not the optimum configuration. There are many ready made beam expanders available on the market, but often they are not available in the required expansion ratio or spectral range. Beam expanders are required in most laser systems to change the diameter of the incoming source to match the requirement of the optical system. The geomatec zoom expander is especially noteworthy as a zoom optic with very low beam distortion. These beam expanders can be conveniently attached to most hene lasers with the 2 accessory thread and except for the t8x, are equipped with precision beam centering adjustments to compensate for slight decentrations of the entering laser beam. Our fixedmagnification, rotatinglens optical beam expander.
Beatrix will consist of an xray source in the focus a grazing incidence paraboloidal mirror to obtain a parallel beam, followed by a. We offer model variations with expansion ratios from 2 to 100 power and output beam diameters to 250mm. A laser beam expander is designed to increase the diameter of a collimated input beam to a larger collimated output beam. In the keplerian beam expander design, the collimated input beam focuses to a spot between the objective and image lenses, producing a point within the system where the lasers energy is concentrated figure 1. A light or laser beam expander is a scientific instrument that allows parallel light or laser rays to have an input beam expanded to become a larger output beam. Translation mounts are designed for the critical alignment of transmissive optics, such as placing a beam collimator within a preexisting beam path. Dec 01, 2017 beam expanders consist of transmissive configurations, with galilean or keplerian designs, and reflective configurations, which use a series of mirrors, similar to microscope designs. The two basic configurations used for these afocal systems are the galilean and the keplerian telescope types, shown in figs. Variable zoom laser beam expanders optomechanics catalog. There are two reasons that you might want or need to expand your laser. By expanding a beam prior to focusing, smaller focal spot sizes can be achieved.
They are ideal for applications in which a small spot must be formed at some distance from the laser, or where the collimation range must be extended for illumination, or for alignment of distant objects. Design wavelengths of 355, 532, 632 and 780 to 1064 nm. Our laser beam expanders provide a fixed expansion factor. In the design of a laser beam expander, the objective and image lenses are reversed. We use either an air spaced two lens system or an achromat in order to minimize chromatic and spherical aberrations and reach diffraction limited performance. Only the txt file for the selected wavelength will be updated. If the beam expander is inclining, the output light will also be inclined.
They utilise a three element design corrected for spherical abberation with a design performa. Infinitely adjustable beam expanders deliver the high level of precision. Beam expanders 10be01 have two lenses and are focusable to minimal distance 2 m. You decide you want to build a beam expander to accomplish this. Motorized oem beam expanders mex topag lasertechnik gmbh. For doppler shift lidar,expansion is also needed to define a cross sectional slice of the field being observed. Unless you want to burn something a few feet away, they are normally focused to infinity, just like a regular laser collimator lens is focused to. Zoom beam expanders correct for laserbeam divergence.
A beam expander can enlarge an input beam by the factor m. Bez10 zoom beam expander introduction the bez10 zoom beamexpander has both zoom and focus controls. Introduction beam expander is used to modify laser beam so that the original beam waist is increased in proportion to the ratio of focal lengths of the first and second lens. The motorized beam expander has been designed for an alignment of zoom and focus without the necessity to open the instrument for. They utilise a three element design corrected for spherical abberation. Beam expanders aperture optical sciences optical components. If a high power laser beam is launched,an expander is used to bring the beam within health and safety requirements.
Special optics line of large output beam expanders provide diffraction limited performance over the entire 100mm aperture, and deliver low wavelength distortion and. In a laser beam expander, the placement of the objective and image lenses is reversed. In a keplerian beam expander the input beam is focussed to a point between the two lenses. Thus by removing the outer halo of the less intense energy from a noisy laser beam it not only reduces the. Geomatec beam expanders high precision, short lead time. By continuing to use this website, you consent to our use of cookies. Motorized beam expander optical components motorized beam expander product information this motorized beam expander has all optical properties of the manual version while offering fully motorized adjustment. It is used for various applications such as laser scanning, interferometry, and remote sensing.
It serves primarily for the expansion of the crosssection of parallel beam bundles, for example of lasers. All beam expanders feature aos worldclass quality aspheric optics and precision alignment mechanics. Beam expander, laser beam expander hyperion optics. This beam expander comprises two identical prisms made of fused silica, with n 1.
The reliability of these methods illustrates that often these procedures can be greatly simplified by observing the laser beam downstream from the element being aligned. Low power beam expanders may have a return reflection that is not suitable with high power lasers. Jul 21, 2016 beam expanders are required in most laser systems to change the diameter of the incoming source to match the requirement of the optical system. Standas diffraction limited galilean type beam expanders offer variable magnification of 2x12x or other ranges see table below with adjustable focus to correct laser beam divergence. How to build a beam expander beam expansion or reduction is a common application requirement in most labs using lasers or light sources and optics. We are able to provide expansion from 1 x to 50 x fixed magnification. Compact beam expanders that do not sacrifice laser beam diameter. The laser beam emitted from the laser has a certain divergence angle. Beam expanders are optical systems for increasing or decreasing the diameter of a laser beam. The reflective design of these beam expanders is achromatic and with aluminium coatings can operate from uv to far ir without adjustment. Eksma optics offers compact galilean type beam expanders for 1064 nm, 532 nm and 355 nm wavelengths. For easy mounting, the beam expanders are also available with external metric threads. Compact beam expanders that do not sacrifice laser beam. Variable beam expander manually adjustable or motorized for different wavelengths.
For the laser processing, only by adjusting the beam expander, the laser beam can be changed into collimated parallel beam, and the fine resolution highdensity facula can be obtained by using the focusing mirror. All adjustments can be made quickly and easily by hand using our unique zoom and focus scale engraved directly onto the beam expander. In size restricted applications, it is desirable to use a compact beam expander but in most cases a compact beam expander is only. Otherwise, one may obtain clipping effects andor not get a collimated beam out.
If and when you need a laser beam expander, youll then need to determine the one that fits your needs best. The compact zoom beam expander is designed primarily for nd. May 01, 2015 laser beam expansion is a common optics tool that is required in many laboratory experiments. Whether your design is an afocal optical beam expander or a multipleprism beam expander, uka using cutting edge technology to create the precise lens. The large aperture beam expander operates at multiple wavelengths to provide highresolution measurements that are insensitive to vibrations and turbulence. These beam expanders are light weight and short bodied and because they are galileo type design, they have little aberration and correction. Technical data continuous adjustable magnification 0. The 4x beam expander can also be fitted with a uv converter plate at its object plane so that you can look at small beams in the spectral range 193360nm and expand them 4x. Say youre building a microscope and you want to expand the coverage of light that is illuminating your sample. Yag 1064, 532, and 355 nm and 800 nm laser sources. A beam expander is an afocal optical system comprising at least two optical elements. A beam expander is a two or more element optical system that changes the beams size and divergence characteristics. The problem is to convert a hene laser with a waist radius of 0.
Zoom beam expander will move to the values determined by the user during calibration tweaking the last time the system was operated. These galilean beam expanders incorporate the highly regarded tropel optical designs with improved adjustability and mounting. A beam expander, if adjustable, can be focused to a point to bring the power back into a smaller area, but the range of focus doesnt allow you to do that for long distances that ive ever seen. Osa beam expander, pinhole, and crosshair alignment to. We also offer variablemagnification beam expanders and reflective beam expanders. The asphericon system covers a wide wavelength spectrum.
All other txt files will retain their factory values. Laser beam expanders used in optics and photonics applications are available at edmund optics. Keplerian beam expanders are designed so that the collimated input beam focuses to a spot between the objective and image lenses, producing a point within the system where the lasers energy is concentrated figure 3. Beam expanders are used in applications such as laser scanning, interferometry, and remote sensing. Dioptika beam expander, beam expanders, laser expander. Discover the advantages of aspherical beam expansion for your application. Translation mount for laser beam expander collimator. Simple methods are presented for aligning beam expanders, pinholes, and crosshairs to laser beams. Cw laser beam expanders galilean design works well for any visible or nearir laser system as a great general purpose beam expander. W4147 make sure that the beam expander is well aligned with the laser light axis.
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