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In some cases, the mentioned nonlinear distortions of scanning lenses can also be compensated with software, so that an f–theta lens is not required.

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Some scanning lenses need to be operated with very high optical powers. It is then important to have low parasitic losses and suitable optical materials in order to avoid thermal effects, which might affect the beam shape and the focal length.

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The luminous intensity grows proportionally to the amperage, which is used in industrial machine vision in order to generate high quantities of light by means of high-power LEDs. A consumption of 5 - 25 watts is typical for an LED illumination. The energy yield can be increased even further if you increase the amperage over 100% of the permissible value. The LED would be damaged in continuous operation immediately. By means of a flash controller, however, short intense current pulses (1 per inspection) can be used to overflash to the triple to sixfold quantity in order to generate a multiple of the luminous power.

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Telecentric lens systems have the obvious limitation that the scanned area on the target plane is limited by the size of the lens. That usually makes them unsuitable for display purposes, for example. An advantage, however, is that one obtains a quite precisely constant spot size over the full area.

The spot on the target plane can become somewhat elliptical, particularly if the beam angle after the scanning lens is substantial. Therefore, one usually needs to limit that angle.

For applications in laser material processing, the damage threshold of the lens system may be of interest. It is normally specified as an optical fluence in units of J/cm2.

Light-emitting diodes, LEDs for short, have been used for approximately 10 years in industrial image processing. By constantly improving the semi-conductor materials, the intensity could be increased extremely. Today, LED lights cover a major part of industrial applications. Halogen and fluorescent lamps are only frequently used in applications which require large-area illumination, like robot applications or line scan camera inspections where much light and/or the illumination of large areas is required as well.

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Pin spacing: 7.5 mm / 0.295 inches. Width: 94.8 mm / 3.732 inches. Height: 15 mm / 0.591 inches. Depth: 25.6 mm / 1.008 inches. Material Data. Note (material ...

Because an exactly linear scanning is not possible, suppliers may specify the field distortion (f–theta distortion) is a function of deflection angle as a percentage. For good designs, the distortions can be far below 1%.

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The most important parameters of a non-telecentric scanning lens are the focal length and the output scan angle, which together determine the scan field diameter. The focal length together with the input beam radius (assuming that there is a collimated beam) determine the beam radius in the target plane: the larger the input beam, the smaller is the spot size.

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For some applications like laser drilling of holes, a remaining problem is that the laser beam hits the target plane with non-normal incidence, except in the central point. Therefore, there are also so-called telecentric scan lenses, which are designed such that one obtains normal incidence for all points of the target plane (see Figure 2).

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For an ordinary flat-field scanning lens, one obtains a nonlinear dependence of the spot position on the angular position of the rotating mirror. That nonlinearity can have various consequences. For example, a displayed or acquired image may be distorted, or the processing speed varies with the position. Therefore, so-called f–theta lenses (actually lens systems) have been developed where the spot position depends linearly (with only weak aberrations) on the beam angle <$\theta$>: it is approximately the product of the focal length <$f$> and the beam angle <$\theta$>. f–theta lenses are quite common for applications like laser marking and laser displays.

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When using a simple spherical lens for that purpose, the focus positions can actually not all be in the wanted plane, but rather lie on an approximately spherical surface. Therefore, the spot size on the target plane will be increased in the outer regions. To solve that problem, flat-field scanning lenses have been developed, which provide an approximately constant spot size throughout the target plane. Precisely speaking, these are usually not simple lenses, but rather multi-element lens systems, having a substantial total length.

Our F–theta scanning lenses are designed for laser marking applications with Nd:YAG laser’s fundamental (1064 nm), second (532 nm) or third (355 nm) harmonic.

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The 03 Series of f–theta scanning lenses for CO2 lasers is designed to provide diffraction-limited optical performance over relatively large fields. Their multiple-lens-element design provides smaller focus spot sizes with virtually no deviation over the entire field and are, therefore, superior to single-element scan lenses. Air-spacing and anti-reflection coatings allow for optical power handling capability in excess of several hundred watts.

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White LEDs, too, primary only generate monochromatic light. Only by means of a trick, white light is produced: The light of a 100% blue-emitting LED stimulates yellow fluorescent dyes, which are arranged around the light-emitting crystal. White light is mixed from the direct emission of blue light and the fluorescence of yellow-green and red light.

Electroluminescent diodes work like semiconductor diodes which generate light in forward direction. Light is emitted in this way. The abbreviation LED stands for "light-emitting diode". The energy and colour of generated light is determined by the semi-conductor material used and its doping. Mixed crystals such as gallium arsenide (GaAs), gallium arsenide phosphide (GaAsP), indium gallium nitride (InGaN), etc. are used.

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The distance from the focus to the output side of the lens system is called the working distance. It is often good to have a substantial working distance, e.g. to avoid contaminations of the lens. It may also be useful to place a protective optical window close to the lens output.

With our pre-engineered lenses, customers can select from a range of preliminary designs that best suit their application. Simply provide us with your application requirements such as dimensions, wavelength range, and field of view, and our skilled engineers will optimize our preliminary designs to meet your exact specifications.

Like other lenses, scanning lenses are often designed for a certain range of operation wavelengths, which may be limited by the properties of used anti-reflection coatings and/or by chromatic aberrations. However, there are also multispectral lenses which work well e.g. at two different wavelengths (e.g. 1064 nm and 355 nm, corresponding to the third harmonic), exhibiting approximately the same focal length for both wavelengths. (This is relevant for multi-photon fluorescence microscopy, for example.) Other devices are color-corrected, also called achromatic, e.g. for use with broadband ultrashort pulses.

For a variety of laser applications such as laser marking, drilling, laser displays, optical coherence tomography (OCT) and scanning laser microscopy, it is necessary to scan the direction of a laser beam and focus it to some plane (or for 1D scanning along a line). Such a laser scanner is often achieved by using some kind of rotating mirror or galvanometer mirror in conjunction with a scanning lens. As shown in Figure 1, such a lens will at the same time focus the beam and modify its propagation direction.

Our pre-engineered lenses give our customers the option to choose from a variety of preliminary designs based on what suits their application best. Just tell us your application requirements (dimensions, wavelength range, field of view, etc.) and our team of expert engineers will optimize our preliminary designs to meet your exact needs. This will save you the hassle of fully designing a product from scratch and help reduce or eliminate design fees!

The LED consists of a semiconductor material that is n-doped, on top there is a very thin p-doped layer which has a lack of charge carriers. When applying a voltage, an excess of charges is generated in the junction, which recombine with holes in the p-doped material and release their energy there. Since the upper layer is very thin, the light flash can emerge from the material. The light generated in this way is monochromatic due to the exactly defined energy amounts of the semiconductor material. As opposed to an incandescent lamp, the light always has one particular colour.

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