laser applications (original) (raw)

Definition: applications involving laser devices

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Contents

Introduction

Lasers are sources of light with exceptional properties, as discussed in the article on laser light. For that reason, there is a great variety of laser applications, leading to a total around 20–25 billion USD of global laser sales (as of 2025). The following sections give a brief overview of fields of applications. Many more specific topics are explained in more depth in further encyclopedia articles.

Laser-aided Manufacturing

Lasers are widely used for laser material processing — mostly in manufacturing, e.g. for cutting, drilling, welding, cladding, soldering (brazing), hardening, surface modification, marking, engraving, micromachining, pulsed laser deposition, lithography, etc. In many cases, relatively high optical intensities are applied to a small spot, leading to intense heating, possibly evaporation and plasma generation. Essential aspects are the high spatial coherence of laser light, allowing for strong focusing, and often also the potential for generating intense pulses.

Laser processing methods have many advantages, compared with mechanical approaches. They allow the fabrication of very fine structures with high quality, avoiding mechanical stress such as caused by mechanical drills and blades. A laser beam with high beam quality can be used to drill very fine and deep holes, e.g. for injection nozzles. A high processing speed is often achieved, e.g. in the fabrication of filter sieves with many holes. Further, the lifetime limitation of mechanical tools is removed. It can also be advantageous for other reasons to process materials without touching them.

The requirements on optical power and beam quality apart from the wavelength depend very much on the application and the involved materials. For example, laser marking on plastics can be done with fairly low power levels, whereas cutting, welding or drilling on metals requires much more — often multiple kilowatts. Soldering applications may require a high power but only a moderate beam quality, whereas particularly remote welding (i.e., welding with a substantial distance between laser head and welded parts) depends on a high beam quality.

Laser-aided manufacturing often allows one to produce essentially the same parts with higher quality and/or lower cost. Also, it is often possible to realize entirely new part designs or the use of new materials. For example, automobile parts are increasingly made of light materials such as aluminum, which often require more laser joining operations. Weight reductions are possible not only by the use of lighter materials, but also e.g. by producing them with shorter flanges due to higher precision than is feasible with conventional production methods.

Lasers are also widely used for alignment purposes. Alignment lasers may simply emit a Gaussian laser beam, forming a circular spot on a workpiece, a line, a cross, or some other pattern. They are important for many manufacturing processes.

Medical Applications

There is a wide range of medical laser applications. Often these relate to the outer parts of the human body, which can easily be reached with light; examples are eye surgery and vision correction (LASIK), dentistry, dermatology (e.g. photodynamic therapy of cancer), and various kinds of cosmetic treatment such as tattoo removal and hair removal.

Lasers are also used for surgery (e.g. of the prostate), exploiting the possibility to cut tissues while causing minimal bleeding. Some operations can be done with endoscopic means; an endoscope may contain an optical fiber for delivering light to the operation scene and another fiber for imaging, apart from additional channels for mechanical instruments.

Very different types of lasers are required for medical applications, depending on the optical wavelength, output power, pulse format, etc. In many cases, the laser wavelength is chosen such that certain substances (e.g. pigments in tattoos or caries in teeth) absorb light more strongly than surrounding tissue so that they can be more precisely targeted.

Medical lasers are not always used for therapy. Some of them rather assist the diagnosis, e.g. via methods of ocular imaging (e.g. optical coherence tomography), laser microscopy or laser spectroscopy (see below).

For more details, see the article on medical lasers.

Laser Metrology

Lasers are widely used in optical metrology, e.g. for extremely precise position measurements and optical surface profiling with interferometers, for long-distance range finding and navigation.

Laser scanners scan the direction of laser beams, which can read e.g. bar codes or other graphics over some distance. It is also possible to scan three-dimensional objects, e.g. in the context of crime scene investigation (CSI).

Optical sampling is a technique applied for the characterization of fast electronic microcircuits, microwave photonics, terahertz science, etc.

Lasers also allow for extremely precise time measurements and are therefore an essential component of optical clocks which are outperforming cesium atomic clocks.

Fiber-optic sensors, often probed with laser light, allow for the distributed measurement of temperature, stress, and other quantities e.g. in oil pipelines and wings of airplanes.

See the article on optical metrology for more details.

Data Storage

Optical data storage, e.g. in compact disks (CDs), DVDs, Blu-ray Discs and magneto-optical disks, nearly always relies on a laser source, which has a high spatial coherence and can thus be used to address very tiny spots in the recording medium, allowing very high-density data storage.

Another area is holography, where the temporal coherence can also be important. Holographic data storage can utilize three dimensions rather than only two on a surface, and therefore store substantially more data.

Communications

Optical fiber communication, extensively used particularly for long-distance optical data transmission, mostly relies on laser light in optical glass fibers.Free-space optical communications, e.g. for inter-satellite communications, is based on higher-power lasers, generating collimated laser beams which propagate over large distances with small beam divergence.

One may also transmit analog RF and microwave signals using radio and microwave over fiber technology.

Displays

Laser projection displays containing RGB sources can be used for cinemas, home videos, flight simulators, etc., and are often superior to other displays concerning possible screen dimensions, resolution and color saturation. However, further reductions in manufacturing costs will be essential for deep market penetration.

Laser Spectroscopy

Laser spectroscopy is used in many different forms and in a wide range of applications. For example, atmospheric physics and pollution monitoring benefit from trace gas sensing with differential absorption LIDAR technology. Solid materials can be analyzed with laser-induced breakdown spectroscopy. Laser spectroscopy also plays a role in medicine (e.g. cancer detection), biology, and various types of fundamental research, partly related to metrology (see above). See also the article on lasers for Raman spectroscopy.

Quantum Photonics

There are various laser applications in the area of quantum photonics. For example, lasers can be used for initializing, manipulating and detecting quantum states of atoms or ions, or aid in trapping of atoms and ions. Methods of laser spectroscopy or quantum communications may also be involved.

For details, see the article on lasers for quantum photonics.

Microscopy

Laser microscopes and setups for optical coherence tomography (OCT) provide images of, e.g., biological samples with very high resolution, often in three dimensions. It is also possible to realize functional imaging.

Various Scientific Applications

Laser cooling makes it possible to bring clouds of atoms or ions to extremely low temperatures. This has applications in fundamental research and also for industrial purposes.

Particularly in biological and medical research, optical tweezers can be used for trapping and manipulating small particles, such as bacteria or parts of living cells.

Laser guide stars are used in astronomical observatories in combination with adaptive optics for atmospheric correction. They allow substantially increased image resolution even in cases where a sufficiently close-by natural guide star is not available.

There are experiments where lasers are used for laser lightning rods. Here, a highly intense laser beam is used to create a conducting channel in air to attract lightning to some (not very high) metallic lightning rod. That way, it might become possible to protect a large area (e.g. an airport) without having a very high metallic lightning rod.

Energy Technology

In the future, high-power laser systems might play a role in electricity generation. Laser-induced nuclear fusion is investigated as an alternative to other types of fusion reactors. High-power lasers can also be used for isotope separation.

Military Applications

There are a variety of military laser applications. In relatively few cases, lasers are used as weapons; the “laser sword” has become popular in movies, but not in practice. Some high-power lasers are currently developed for potential use as directed energy weapons on the battlefield, or for destroying missiles, projectiles and mines.

In other cases, lasers function as target designators or laser sights (essentially laser pointers emitting visible or invisible laser beams), or as irritating or blinding (normally not directly destroying) countermeasures e.g. against heat-seeking anti-aircraft missiles. It is also possible to blind soldiers temporarily or permanently with laser beams, although the latter is forbidden by the rules of war.

There are also many laser applications which are not specific for military use, e.g. in areas such as range finding, LIDAR, and optical communications.

Applications in Space

In space, lasers may be used for very different purposes. Some examples:

See also the article on space-qualified lasers.

Frequently Asked Questions

What are the main fields of laser applications?

Lasers are used in a vast range of fields, including manufacturing (cutting, welding), medicine (surgery, vision correction), optical metrology, data storage, communications, displays, spectroscopy, and military applications.

How are lasers used in manufacturing?

What are some common medical applications of lasers?

Common medical uses include eye surgery (LASIK), dermatology, tattoo removal, and laser surgery. Lasers also assist in diagnosis through methods like optical coherence tomography and laser microscopy.

Why are lasers essential for optical data storage?

The high spatial coherence of laser light allows it to be focused onto very tiny spots. This enables the high data storage density found in media like CDs, DVDs, and Blu-ray Discs.

How do lasers contribute to communications?

What is laser spectroscopy used for?

Laser spectroscopy is used for highly sensitive chemical analysis. Applications include monitoring atmospheric pollution with LIDAR, analyzing materials with laser-induced breakdown spectroscopy, and cancer detection in medicine.

What are the advantages of laser material processing over mechanical methods?

Laser processing allows for the fabrication of very fine structures with high quality, avoids mechanical stress, and offers high processing speeds. It is not limited by the wear of mechanical tools.

Can lasers be used as weapons?

Yes, high-power lasers are being developed as directed energy weapons. Lasers are also used as target designators and sights, or to blind sensors, though permanently blinding soldiers is forbidden by the rules of war.

What are laser guide stars?

A laser guide star is an artificial star created by projecting a laser into the upper atmosphere. Astronomical observatories use it with adaptive optics to correct for atmospheric distortions and improve image resolution.

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