In contrast, Optical coherence tomography uses light with a short coherence time.

In contrast, the LM had an Alignment Optical Telescope, and could only determine the craft's orientation.

By contrast, at the 2004 Optical Society of America " Conference on Lasers and Electro-Optics ," held in San Francisco, California, one company ( Coherent, Inc .) announced 45 watt continuous wave single-mode emission from an optically pumped VECSEL.

Steps 2, 3 and 4: The license plate is normalized for brightness and contrast, and then the characters are segmented to be ready for Optical character recognition | OCR.

In optics, an equivalent device for the diode but with laser light would be the Optical isolator, also known as an Optical Diode, that allows light to only pass in one direction.

Optical lithography has been extended to feature sizes below 50 nm using the 193 nm ArF excimer laser and liquid immersion techniques.

Closed-loop mirror galvanometers are also used in stereolithography, in laser sintering, in laser engraving, in laser beam welding, in laser TV, in laser displays, and in imaging applications such as Optical Coherence Tomography ( OCT ) retinal scanning.

Optical corner reflectors, called corner cubes, made of three-sided glass prisms, are used in surveying and laser rangefinding.

Optical amplifiers are important in optical communication and laser physics.

A FASOR ( laser physics ) | FASOR used at the Starfire Optical Range for LIDAR and laser guide star experiments is tuned to the Fraunhofer lines | sodium D2a line and used to excite sodium atoms sodium layer | in the upper atmosphere.

Optical hobbyists have been known to cannibalize the laser tube machines.

Optical tweezers ( originally called " single-beam gradient force trap ") are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force ( typically on the order of piconewtons ), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects.

Optical tweezers are capable of manipulating nanometer and micrometer-sized dielectric particles by exerting extremely small forces via a highly focused laser beam.

Optical tweezing operations with more than two traps can be realized either by time-sharing a single laser beam among several optical tweezers, or by diffractively splitting the beam into multiple traps.

The standard fiber optical trap relies on the same principle as the optical trapping, but with the Gaussian laser beam delivered through an Optical fiber.

The Optical Cell Rotator is a fiber based laser trap that can hold and precisely orient living cells for tomographic microscopy.

Optical engineering metrology uses optical methods to measure micro-vibrations with instruments like the laser speckle interferometer or to measure the properties of the various masses with instruments measuring refraction.

At a May 1973 meeting of the Denver Optical Society of America, in Denver, Colorado, Bhaumik announced his success with laser and later patented his invention.

* Optical isotope shifts of Nd II by collinear fast-ion-beam laser spectroscopy ; Ma Hongliang, Shi Wei, Yan Bin, Li Yong, Fang Dufei, Lu Fuquan, Tang Jiayong and Yang Fujia ; J. Phys.

* Optical gain spectroscopy of semiconductor laser materials.

Optical cavities are a major component of lasers, surrounding the gain medium and providing feedback of the laser light.

Five years after the first excimer laser was invented in 1970 by Nikolai Basov, and two years after Northrop Corporation Research and Technology Center's team leader, Dr. Bhaumik announced the successful demonstration of the world's first efficient excimer laser at the Denver, Colorado meeting of the Optical Society of America in May 1973, Hart along with Naval Research Laboratory colleague, Stuart Searles, ( also confer Charles Brau, James J. Ewing ) invented ( and patented ) an excimer laser improvement ; subsequently, excimer lasers found extensive use as the type of laser that made possible the immensely popular Lasik corrective eye surgery, and are utilized today in semiconductor manufacturing.

Optical mineralogy is a specific focus of mineralogy that applies sources of light as a means to identify and classify minerals.

Optical path difference is the phase shift which happens between two previously coherent sources when passed through different mediums.

The stereo information is carried on stereo sources such as VHS TV, DVD's, 35mm Theatrical Print Optical Soundtrack, Television Broadcasts from which the surround information can be decoded by a processor to recreate the original Dolby Surround ( left, center, right, sub and surround ) mix.

Simjian gained commercial success during World War II with another invention, his Optical Range Estimation Trainer, a kind of simple flight simulator, made from mirrors, light sources and miniature airplanes, used to train US military pilots in estimating the speed and distance of airplanes.

Optical communications systems ( even wireless ones ) tend to have weak multipath distortions, and PPM is a viable modulation scheme in many such applications.

* Optical or infrared: The individual galaxies of clusters can be studied through optical or infrared imaging and spectroscopy.

* Optical parametric amplification ( OPA ), amplification of a signal input in the presence of a higher-frequency pump wave, at the same time generating an idler wave ( can be considered as DFG )

Optical coatings, protective and decorative coatings, and electro-optic components can be applied to glass, metal and other types of substrates with these methods.

Optical fibers can be included in the stranded conductors of a transmission line, in the overhead shield wires.

Optical activity or rotation should not be confused with circularly polarized light.

In fiber optics and telecommunications, an index-matching material may be used in conjunction with pairs of mated connectors, with mechanical splices, or at the ends of fibers ( see: Optical fiber connector ).

Optical character recognition ( OCR ) can be used to enable machines to read information available to humans.

In collaboration with the American Optical company Todd developed a system which was to be called " Todd-AO ".

* Optical surveillance: Optical surveillance, while not a keylogger in the classical sense, is nonetheless an approach that can be used to capture passwords or PINs.

Optical see-through employs half-silver mirrors to pass images through the lens and overlay information to be reflected into the user's eyes.

LOCS III's NC0, C0 and P0 can be converted as OBBCGS ' no cataract ( NC ), LOCS III's NC1-3, C1-3, P1-4 can be converted to OBBCGS ' Optical Biometry Examined Cataract ( OBEC ) and LOCS III's NC4-5, C4-5, P4-5 can be converted to OBBCGS's Optical Biometry Unexamined Cataract ( OBUC ); that need examination by Applanation Ultrasound Biometry.

Optical relay systems that allow the source and detector each to be about a meter from the sample are typically employed.

The United Kingdom / Carl Zeiss / Bausch & Lomb Optical Works was established at Mill Hill East in 1912 and demolished in about 1990, to be replaced by a large building owned by the Jehovah Witnesses, to complement their nearby Watchtower House built on the site of the former Bittacy House.

Optical power can also be used to adjust a basic prescription for reading.

In addition, Side looking radars, High-powered Optical Satellites, and sky-scanning, high-Aperature, high sensitivity Radars such as Radio telescopes, would all be able to narrow down the location of a Stealth aircraft under certain parameters.

The term first appeared in print in Time magazine in October 1964 in response to Julian Stanczak's show Optical Paintings at the Martha Jackson gallery, though works which might now be described as " op art " had been produced for several years previously.