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The bottom line is that chromatic dispersion becomes a major consideration and must be accounted for when developing or deploying fiber optic equipment for use in telecommunications, cable TV, or other high-speed optical networks.

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Fortunately, techniques have been developed that help compensate for the negative effects of chromatic dispersion.  One method involves pre-compensating the signal for the anticipated dispersion before it's sent down the optical fiber.  Another method calls for using dispersion compensating fiber at the end of a length to correct or reverse the dispersion that was realized as the signal traversed the optical fiber.  As a result, these techniques are widely used to help solve the problem of chromatic dispersion.

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Topics: optical fiber, dispersion compensating fiber

You need to tilt the far edge of the secondary (the part in the lower left of the image) further away from the focuser tube. That means ...

Chromatic dispersion is a phenomenon that is an important factor in fiber optic communications.  It is the result of the different colors, or wavelengths, in a light beam arriving at their destination at slightly different times.  The result is a spreading, or dispersion, of the on-off light pulses that convey digital information.  Special care must be taken to compensate for this dispersion so that the optical fiber delivers its maximum capacity.

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Longitudinal chromatic aberration is when the lens positions the image of an object in different focal planes according to the wavelength of the light ...

Laser engraving is a method of marking where a focused laser beam carves a design into a material’s surface. The indented marks are created by evaporating the surface. Four types of lasers are used for engraving: UV, fibre, CO2, and hybrid. Each of the different types of laser engravers is ideal for different materials, products, and industries.

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CO2 laser engravers work by generating plasma and CO2 gas inside of a tube, amplifying that light between a reflective mirror and output coupler, and then output as a laser beam. The output laser beam has a wavelength of 10600 nm.

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Lens Distortion Correction (LDC) is a digital image processing technique used for rectifying the distortions introduced by the inherent optical properties ...

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Dark marking, often referred to as oxidising, is the act of burning the top layer of material to create a dark contrasting mark. This is extremely common on metal surfaces and often creates a mark that raises the materials surface.

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Chromatic dispersion is a serious consideration in long-haul optical fibers.  Its effect is essentially to stretch or flatten the initially sharply-defined binary pulses of information.  This degradation makes the signals (1s and 0s) more difficult to distinguish from each other at the far end of the fiber.  The result is that at any given length, the effective information capacity, or bandwidth, of the fiber optic cable can be significantly reduced.  Dispersion is added as the modulated beam of light, consisting of a number of closely spaced wavelengths, travels down this nearly transparent waveguide.

While this blog talks about common types of laser marking methods, many more types of laser abilities and machines are available. For example:

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Fibre engraving gets its name from the fibre resonator intensifying the 1090 nm laser beam. The fibre resonator makes fibre laser machines have notably high output power and engraving speed.

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Chromatic dispersion is commonplace, as it is actually what causes rainbows - sunlight is dispersed by droplets of water in the air.  Sir Isaac Newton observed this phenomenon when he passed sunlight through a prism and saw it diverge into a spectrum of different colors.  This dispersion occurs because different colors, or light frequencies, act slightly differently as they pass through a medium such as glass.  In fiber-based systems, an optical fiber, comprised of a core and cladding with differing refractive index materials, inevitably causes some wavelengths of light to travel slower or faster than others.

UV laser engraving uses ultraviolet light and high absorption to mark materials. The UV laser engraving process is known as “cold marking” because it does not add heat stress or burn the material. The laser marking machine creates a UV beam using two nonlinear crystals as the passageway. It shoots a 1064 nm laser beam through the crystals to convert the beam to a 355 nm laser.

Laser marking is an umbrella term for creating a design on a surface with a laser beam. Within this general term, manufacturers can access a range of possibilities with types of laser marking machines and processes. For instance: engraving, oxidising, annealing, and etching are marking methods used by many common types of laser markers. Unfortunately, there is no one-size-fits-all when it comes to laser marking. However, some types of laser marking processes are more popular than others because of their versatility. Common types of laser marking applications being used by manufacturers include engraving, colour marking, and traceability marking.

A white marking, also known as an etch, is achieved via light surface roughening of a component. The roughened surface alters the materials' reflectivity producing a white contrast. This white marking can be achieved by each type of laser, depending on the target material.

Nevertheless, engraving and colour marking are widely used across materials, products, and industries. There are many uses in these types of laser marking categories, from using a CO2 laser for engraving to a fibre laser for annealing. If you’re looking for more information about lasers, whether that be types of laser marking, types of laser engravers, or different types of laser machines, ask KEYENCE! At KEYENCE, we specialise in laser technology. Our laser technology is used in measurement devices, marking devices, microscopes, and more. Regardless of your industry, prior laser knowledge, or manufacturing goals, we are here to help you learn more about lasers! Contact us today to learn more information about different types of laser machines.

Annealing, also known as carbon migration, is a style of laser marking that is extremely popular in the aerospace and medical industries as it leaves behind a mark that is highly contrasting and easy to see, but does not raise the surface of the material or create any depth, thus allowing parts to still meet tight surface finish specifications and tolerances. This is achieved by de-focusing the laser to spread the heat over a wider beam spot. This act pulls the carbon content of the material to surface level, creating a visible mark. This marking style is achieved only on ferrous materials.