Photonics/​Optics

Photonics

Find the latest news and technical briefs on next-generation photonics technologies. Learn more about applications like biophotonics, silicon photonics, and green photonics.

Briefs: Photonics/Optics

Fiber-optic couplers for spherical, toroidal, and other, similarly shaped microscopic optical resonators that operate in whispering-gallery (WG) modes would be fabricated with integral...

Briefs: Photonics/Optics

A proposed radiometric instrument denoted the spotlight radiometer (SLR) would operate in a frequency band centered at ≈557 GHz and would scan in a conical or circular pattern. The SLR was conceived for use in...

Briefs: Photonics/Optics

A design for an unobscured, large-aperture but otherwise compact laser-beam expander relies solely on spherical reflecting and refracting surfaces, yet provides a...

Briefs: Photonics/Optics

An improved and expanded method of stereo imaging velocimetry (SIV) for diagnosing three-dimensional flows of gases, liquids, and other fluids involves the use of standard charge-coupled-device...

Briefs: Physical Sciences
Infrared Fiber-Optic Endoscope

A proposed infrared transmitting fiber-optic endoscope, which would partly resemble a visible-light fiber-optic endoscope, instrument could be used to perform thermal imaging in harsh environments and/or confined spaces in a variety of situations in aerospace, industrial, automotive, and medical settings.

Briefs: Photonics/Optics

An unconventional and highly effective technique has been devised to reduce cyclic errors that arise in the operation of a displacement-measuring heterodyne optical interferometer....

Briefs: Photonics/Optics
Fiber-Optic Probe Uses Evanescent Waves To Sense Biofilm

A compact instrument includes a fiber-optic probe that utilizes the evanescent-wave interaction to measure the accumulation of a biofilm. This instrument is a prototype of instruments that could be used to effect continuous monitoring and provide early warning of biofilms associated with...

Briefs: Photonics/Optics

A mid-infrared wave-number range has been identified as being useful for laser measurements of CO and CO2 gases that contain various combinations of isotopes of C and O. The...

Briefs: Photonics/Optics

The figure schematically depicts two proposed alternative versions of an instrument that amounts, in effect, to a compact, lightweight optoelectronic microscope that contains no...

Briefs: Photonics/Optics

The figure depicts the laboratory setup of an optical-fiber-coupled microsphere laser with an output in the 1.55-µm wavelength band used in some communication systems. This laser...

Briefs: Photonics/Optics

A conceptually simple, effective scheme for reliable, high-power pumping of neodymium:yttrium aluminum garnet (Nd:YAG) lasers (and perhaps also other solid-state lasers) has been devised. Heretofore, it has been common...

Briefs: Photonics/Optics
Fiber-Optic Liquid-Level Sensors

Liquid-level-measuring systems based on fiber-optics are under development as compact, lightweight alternatives to systems based on float gauges and other conventional sensors. For liquids that pose explosion hazards, fiber-optic sensors are inherently safer because they do not include electrical connections...

Briefs: Photonics/Optics
Multiple-Beam System for Fast Raman Spectrometry

A developmental instrumentation system rapidly acquires full Raman spectra of gas molecules. The system is based on the principle of multiplex coherent antistokes Raman spectroscopy (CARS) and incorporates improvements over prior multiplex CARS systems. Among the potential applications for systems...

Briefs: Medical

According to a proposal, laser-induced acoustic shock waves would be used to lyse cells as needed for biomolecular investigations, including, for example, diagnosis of diseases,...

Briefs: Photonics/Optics
Profile Refractometry for Measuring the Soret Effect

Profile refractometry is a laser-based technique for measuring the index of refraction of a fluid as a function of time and position in a fluid. The technique was developed for use in quantifying the Soret effect in a binary fluid subject to an applied thermal gradient. (The Soret effect is...

Briefs: Photonics/Optics
Synthesis of Optical Pulses Using Brillouin Amplification

A technique for Fourier synthesis of optical pulses involves radio-frequency (RF) phase modulation of laser beams, Brillouin selective amplification of modulation sidebands, and, finally, generation of pulses through coherent superposition of (and thus interference among) the sidebands....

Briefs: Photonics/Optics
Generalized-Time-Line Program for Planning and Scheduling

Generalized Timelines API is a computer program that provides (1) a means of representing arbitrary realworld state and resource information for use in planning, scheduling, and plan- and schedule-executing software and (2) an application-programming interface (API) that accelerates the...

Briefs: Photonics/Optics
Fabricating Sapphire Optical Fibers for High-Temperature Use

A process for the fabrication of coated sapphire multimode optical fibers has been developed. Sapphire multimode optical fibers are suitable for use as embedded sensors for measuring mechanical and thermal stresses and strains in material specimens at temperatures up to about 1,500...

Briefs: Photonics/Optics

An optoelectronic device based on interferometry in a resonant microcavity has been proposed for use in measuring the direction of arrival of a circularly polarized beam of light...

Briefs: Photonics/Optics

A process that would include a combination of dry and wet chemical etching has been proposed for making facets for low-loss mirrors on silicon-on-insulator (SOI) optical waveguides....

Briefs: Photonics/Optics

The figure depicts the basic optical layouts for (1) conventional laser Doppler velocimetry (LDV) and (2) a newer method of LDV based partly on the use of two optical fibers. Whereas...

Briefs: Photonics/Optics
Stabilization and Registration of Sequential Video Images

A computational process converts a sequence of digitized video images of the same scene into stabilized, coregistered images of an area of interest within the scene. The process corrects for motion of the area of interest or of the camera (as manifested by rotation, translation, and/or...

Briefs: Electronics & Computers

Focal-plane arrays of quantum-well infrared photodetectors (QWIPs) featuring adjacent pixels sensitive to different colors have been proposed. An array of this type would make it...

Briefs: Photonics/Optics

A technique for projecting holographic images to make both still and moving three-dimensional displays is undergoing development. Unlike older techniques based on stereoscopy to give...

Briefs: Photonics/Optics

"Laser-based adaptive wavelength division multiplexing and code division multiplexing" (LAWDM-CDM) is the name of a method that has been proposed to increase security,...

Briefs: Photonics/Optics

A magnetically suspended, motor-driven light-chopping wheel has been developed as an alternative to a traditional light-chopping wheel suspended on ball bearings. This chopper (see figure) is...

Briefs: Photonics/Optics

A video camera has been integrated with a tracking pedestal (see figure) for tracking of aircraft and spacecraft. The camera is of a high-definition (1,280 × 720 pixels),...

Briefs: Photonics/Optics

A proposed lightweight, micromachined, multiaxis-steerable mirror would have mesoscopic dimensions. Its steering function would involve mesoscopic positional excursions of its support points and would be...

Briefs: Photonics/Optics

An optical system that utilizes visible light at nearly perpendicular incidence has been invented for use in testing the surface figures of nominally axisymmetric (paraboloidal,...

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