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ⓘ Optical devices ..




                                               

Acousto-optic modulator

An acousto-optic modulator, also called a Bragg cell, uses the acousto-optic effect to diffract and shift the frequency of light using sound waves. They are used in lasers for Q-switching, telecommunications for signal modulation, and in spectroscopy for frequency control. A piezoelectric transducer is attached to a material such as glass. An oscillating electric signal drives the transducer to vibrate, which creates sound waves in the material. These can be thought of as moving periodic planes of expansion and compression that change the index of refraction. Incoming light scatters off th ...

                                               

Acousto-optic programmable dispersive filter

An acousto-optic programmable dispersive filter is a special type of collinear-beam acousto-optic modulator capable of shaping spectral phase and amplitude of ultrashort laser pulses. AOPDF was invented by Pierre Tournois. Typically, quartz crystals are used for the fabrication of the AOPDFs operating in the UV spectral domain, paratellurite crystals are used in the visible and the NIR and calomel in the MIR. Recently introduced Lithium niobate crystals allow for high-repetition rate operation owing to their high acoustic velocity. The AOPDF is also used for the active control of the carri ...

                                               

Aquascope

An aquascope is an underwater viewing device. It is used to view the underwater world often from dry land or a boat. It eliminates the water surface glare and allows viewing as far as water clarity and light permit. The underwater viewer can be used for observing reefs, checking boat moorings, secchi disks and other survey work. It is also used as educational tool to watch plants, creatures and habitats underneath the surface of rivers, lakes and seas. A more advanced version, an underwater telescope was patented by Sarah Mather in 1845 - U.S. Patent No. 3.995; it permitted sea-going vesse ...

                                               

Arrayed waveguide grating

Arrayed waveguide gratings are commonly used as optical multiplexers in wavelength division multiplexed systems. These devices are capable of multiplexing many wavelengths into a single optical fiber, thereby increasing the transmission capacity of optical networks considerably. The devices are based on a fundamental principle of optics that light waves of different wavelengths do not interfere linearly with each other. This means that, if each channel in an optical communication network makes use of light of a slightly different wavelength, then the light from many of these channels can b ...

                                               

ARROW waveguide

In optics, an anti-resonant reflecting optical waveguide is a waveguide that uses the principle of thin-film interference to guide light with low loss. It is formed from an anti-resonant Fabry–Perot reflector. The optical mode is leaky, but relatively low-loss propagation can be achieved by making the Fabry–Perot reflector of sufficiently high quality or small size.

                                               

Auston switch

An Auston switch is an optically gated antenna that is commonly used in the generation and detection of pulsed terahertz radiation. It is named after the physicist David H. Auston who first developed the technology at Bell Labs in the 1960s.

                                     

ⓘ Optical devices

  • An optical modulator is a device which is used to modulate a beam of light. The beam may be carried over free space, or propagated through an optical waveguide
  • An optical cavity, resonating cavity or optical resonator is an arrangement of mirrors that forms a standing wave cavity resonator for light waves. Optical
  • mirror. Optical cross section is not limited to reflective surfaces. Optical devices such as telescopes and cameras will return some of the optical flux
  • produces optical lenses. Headquartered in Yuyao, Ningbo, Zhejiang Province, Sunny Optical Technology designs, manufactures, and sells optical devices including
  • An optical circulator is a three - or four - port optical device designed such that light entering any port exits from the next. This means that if light
  • physical data transfer, optical discs such as CDs and DVDs are gradually being replaced with faster, smaller solid - state devices especially the USB flash
  • production of all optical devices including all optical computers. Researchers realised later the inherent limitation of the optical systems due to the
  • An optical switch is a device that selectively switches optical signals from one channel to another. The switching can be temporal or spatial.The former
  • An optical power meter OPM is a device used measure the power in an optical signal. The term usually refers to a device for testing average power in
  • Application - specific devices such as synthetic aperture radar SAR and optical correlators, have been designed to use the principles of optical computing. Correlators
  • using electronic devices The earliest basic forms of optical communication date back several millennia, while the earliest electrical device created to do
  • instrument. An optical sensor is generally part of a larger system that integrates a source of light, a measuring device and the optical sensor. This is
                                               

Lyot stop

A Lyot stop is an optic stop, invented by French astronomer Bernard Lyot, that reduces the amount of flare caused by diffraction of other stops and baffles in optical systems. Lyot stop is located at the target image formed by a lens box with a hole slightly smaller than the objective image. Example statements can be found in Ref.

                                               

Panoramagram

The panoramagram is an instrument invented in 1824 and a method of stereoscopic viewing in which the left-eye and right-eye photographs are divided into narrow juxtaposed strips and viewed through a superimposed ruled or lenticular screen in such a way that each of the observers eyes is able to see only the correct picture. Also used to obtain the illusion of depth of one or more objects placed on the horizon and reflected on a flat surface.

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