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Laser cutting

Fresnel lenses consist of a series of concentric grooves etched into plastic. Their thin, lightweight construction, availability in small as well as large sizes, and excellent light gathering ability make them useful in a variety of applications. Fresnel lenses are most often used in light gathering applications, such as condenser systems or emitter/detector setups. They can also be used as magnifiers or projection lenses in illumination systems, and image formulation.

Laguerre Gaussbeam

The driving principle behind the conception of a Fresnel lens is that the direction of propagation of light does not change within a medium (unless scattered). Instead, light rays are only deviated at the surfaces of a medium. As a result, the bulk of the material in the center of a lens serves only to increase the amount of weight and absorption within the system.

A Fresnel lens can easily collimate a point source by placing it one focal length away from the source. In a finite-conjugate system, the grooved side of the Fresnel lens should face the longer conjugate (Figures 3 - 4) because this produces the best performance.

Laser M2

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In laser material processing, this is employed in laser beam cutting or welding, for example. Since the laser beam can do this work virtually without contact, it does not deteriorate during the process as does a drill or milling head. The laser beam is directed by the beam generator (laser device) via beam steering to the processing optics using a mirror or optical fibre technology. The processing optic concentrates the laser beam and focuses it, with focal lengths adjusted to the particular process. The typical properties of the focused laser beam are described by the minimum achievable beam diameter (focus) and the beam caustic. The caustic represents the path of the beam diameter coming from the processing optic to the focus and after it.

Beamdivergence

It can be seen from the above that analysis of the laser beam tool by beam diagnostics must primarily be directed at the 4 named beam properties in order to describe or analyse the interaction of the laser beam with the tool during the process, and where applicable identify sources of error.

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To take advantage of this physical property, 18th-century physicists began experimenting with the creation of what is known today as a Fresnel lens. At that time, grooves were cut into a piece of glass in order to create annular rings of a curved profile. This curved profile, when extruded, formed a conventional, curved lens – either spherical or aspherical (Figure 2). Due to this similar optical property compared to a conventional optical lens, a Fresnel lens can offer slightly better focusing performance, depending upon the application. In addition, high groove density allows higher quality images, while low groove density yields better efficiency (as needed in light gathering applications). However, it is important to note that when high precision imaging is required, conventional singlet, doublet, or aspheric optical lenses are still best.

Fresnel lenses can be manufactured from a variety of substrates. They are manufactured from acrylic to polycarbonate to vinyl, depending on the desired wavelength of operation. Acrylic is the most common substrate due to its high transmittance in the visible and ultraviolet (UV) regions, but polycarbonate is the substrate of choice in harsh environments due to its resistance to impact and high temperature.

While French physicist Augustin-Jean Fresnel (1788 - 1827) was not the first to conceptualize a Fresnel lens, he was able to popularize it by integrating it into lighthouses. Since then, Fresnel lenses have been utilized in a variety of applications, from light collimation and light collection to magnification.

Beamquality

Another common application for a Fresnel lens is magnification. It can be used as a magnifier or projection lens; however, due to the high level of distortion, this is not recommended. Also, the image quality does not compare to that of a higher-precision system given the amount of distortion.

A Fresnel (pronounced fray-NEL) lens replaces the curved surface of a conventional optical lens with a series of concentric grooves. These contours act as individual refracting surfaces, bending parallel light rays to a common focal length (Figure 1). As a result, a Fresnel lens, while physically narrow in profile, is capable of focusing light similar to a conventional optical lens but has several advantages over its thicker counterpart.

Gaussianbeam

A significant parameter for laser material processing is so-called depth of focus, defined as Rayleigh length. It states the distance from the focus at which the area of the beam cross-section has doubled. If, for example, Rayleigh length and sheet metal thickness are adjusted to each other when laser beam cutting, straight cutting edges can be produced. If the sheet metal thickness is too great, the edges become increasingly more rounded.

The first Fresnel lenses were made by tediously grinding and polishing glass by hand. Eventually, molten glass was poured into molds, but it was only with the development of optical-quality plastics and injection-molding technology in the 20th-century that the use of Fresnel lenses in many industrial and commercial applications became practical.

One of the most common applications for a Fresnel lens is the collection of solar light, which is considered very nearly parallel (an infinite-conjugate system). Using a Fresnel lens for light collection is ideal for concentrating light onto a photovoltaic cell or to heat a surface. For example, a Fresnel lens can be used for popular home maintenance such as heating a home or pool! In these cases, the overall surface area of the lens determines the amount of collected light.

As a tool, the laser beam is characterised by certain properties. Fundamental properties of laser light are its monochromatic nature (one wavelength) and directionality (narrow divergence). In contrast to the beam from a normal light source, laser beams can be very sharply focused. In combination with a laser beam's high power density, a beam of such intensity and limited local focus can be generated that material can be melted or vaporised.

While commonly found in solar applications, Fresnel lenses are ideal for any application requiring inexpensive, thin, lightweight positive lens elements. Fresnel lenses are not new technology, but their pervasiveness has increased with improvements in manufacturing techniques and materials. Fresnel lenses are truly unique optical lenses which make them a great tool for a range of interesting and fun optical designs.