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

A spectrometer has been developed for acquiring transient emission and absorption spectra in the wavelength range from 1.2 to 5.0 µm. It could be used to characterize flames, turbulence, and other transient...

Briefs: Photonics/Optics

An improved photodiode-based complementary metal oxide/semiconductor (CMOS) active-pixel sensor (APS) incorporates features to (1) allow imaging with very high electronic shutter...

Briefs: Photonics/Optics

A fiber-optic illumination device that aids the inspection of window surfaces has been improved to make it suitable for automated detection of pits, scratches, and subsurface damage...

Briefs: Photonics/Optics

Two improved schemes for the design and operation of photodiode-based CMOS (complementary metal oxide/ semiconductor) active-pixel sensors (APSs) afford zero image...

Briefs: Photonics/Optics
Whispering-Gallery-Mode Microspheres as Light Modulators

Light modulators of a proposed type would exploit the propagation of lightin "whispering-gallery" electromagnetic modes in microspheres made of electro-optical materials. These modulators would offer advantages of ultrahigh modulation efficiency and increased bandwidth, relative to their...

Briefs: Photonics/Optics
Electrodeposition of Strong Glassy Metals

Thin-walled structures made of strong glassy nickel and glassy nickel-cobalt alloys, with tailorable low residual stresses, and with high resistance to permanent plastic deformation, can be formed by use of an electrodeposition process. This process was developed to enable the fabrication of lightweight,...

Briefs: Photonics/Optics

A technique of parallel-beam interferometry with spatially incoherent light has been proposed to solve two problems that arise in conjunction with using interferometry to measure the shape...

Briefs: Photonics/Optics

A method of correcting for the distorting effects of the atmosphere upon a laser beam used in free-space optical communication has been proposed. The original version of the method...

Briefs: Photonics/Optics
Improved Optical Fallout Monitor

Modifications have been made to upgrade the system described in "Optoelectronic Particle-Fallout Sensor" (KSC-11687), NASA Tech Briefs, Vol. 19, No. 4 (April 1995), page 17a. A description of the unmodified version of the system is necessary to place a description of the modifications in context:

Briefs: Photonics/Optics

In a proposed method for rapidly detecting hydrazine in air at concentrations at or above 10 parts per billion by volume (ppbv), tunable diode lasers (TDLs) and photodetectors would be...

Briefs: Photonics/Optics

A proposed electro-optical apparatus would shift the frequency of a laser beam by a controllable amount within the range of about ±10 GHz. It would be a wide-band alternative to an acousto-optical...

Briefs: Photonics/Optics

Plasma spraying has been shown to be an effective means of depositing thin films of various oxides for use as wavelength-selective emitters for thermophotovoltaic devices (see Figure...

Briefs: Photonics/Optics

Calcium bromide can be added to the sulfur filling in a sulfur lamp to increase the emission of red light for enhanced growth of plants. Red light is more efficacious for plant...

Briefs: Photonics/Optics
Maskless Gray-Scale X-Ray Lithography

In a proposed technique of maskless gray-scale x-ray lithography, a photoresist to be patterned would be exposed to a parallel beam of hard x-rays. As explained below, the photoresist would be translated across the beam at a varying rate to effect one-dimensional spatial variations in the radiation dose...

Briefs: Photonics/Optics
Nonsaturating Electronic Image Sensors

Focal-plane electronic image sensors that would not saturate when exposed to intense illumination have been proposed. These sensors could be used to acquire accurate, scientific-quality data on images (including spectral images), even when the images contain both very bright and very dark areas. The...

Briefs: Photonics/Optics

A methodology for designing highly accurate readout circuits for infrared (IR) image detectors that have large pixel detector capacitances (of the order of tens of picofarads) and...

Briefs: Photonics/Optics

Efforts are under way to develop a technique of noncontact acousto-ultrasonic testing in which (1) a pulsed laser beam excites ultrasonic waves in a plate specimen and (2) the...

Briefs: Photonics/Optics

Irradiation by the beam from a CO2laser has been found to be an effective means of marking a black anodized aluminum surface. In general, this process works on any dark...

Briefs: Photonics/Optics

A proposed focal-plane array (FPA) of quantum-well infrared photodetectors (QWIPs) would sense images in three different infrared wavelength bands simultaneously. These and other QWIP infrared...

Briefs: Photonics/Optics
Update on Fuzzy-Logic-Enhanced Digital-PIV Software

Two reports present additional information on the subject matter of "Software for Processing Data in Particle-Image Velocimetry" (LEW-16857),NASA Tech Briefs, Vol. 24, No. 1 (January 2000), page 26a. Like the cited prior article, both reports discuss the principles and the practical aspects of...

Briefs: Photonics/Optics

Random reflectors of a proposed type would be fabricated on the back surfaces of quantum-well infrared photodetectors (QWIPs) to increase the coupling efficiency of infrared light into the QWIPs in two...

Briefs: Photonics/Optics

Tridirectional diffraction gratings have been proposed to provide optical coupling to quantum-well infrared photodetectors (QWIPs) in focal-plane arrays. The tridirectional gratings...

Briefs: Photonics/Optics
Optical Filters Based on Dense Arrays of Microscopic Pillars

A proposal for development of a class of high-transmission and antireflection optical filters is derived from the observation that the eyes of moths reflect almost no light, regardless of the wavelength or the angle of incidence of illumination. The low-reflection property of moth...

Briefs: Photonics/Optics

Organic light-emitting diodes (OLEDs) are grounded in a self-luminous display technology based on thin organic films as the light emitter. Like conventional inorganic...

Briefs: Photonics/Optics

A simplified microwave radiometric apparatus has been proposed for use in quantifying the potential danger of accretion of ice onto an aircraft flying through a cloud. The quantity...

Briefs: Photonics/Optics

A developmental electro-optical system would enable remote real-time viewing of a scene through a multimode optical fiber, as though the fiber were a conventional image-transmitting optic...

Briefs: Photonics/Optics

Precise small apertures for a variety of optical applications can be formed in silicon-on-insulator (SOI) wafers by use of a photolithographic process developed specifically for the...

Briefs: Physical Sciences

A method of processing phase measurements in an unequal-arm laser Michelson interferometer makes it possible to detect phase effects much smaller than the laser phase noise. In...

Briefs: Photonics/Optics

The figure depicts several aspects of a unique type of vertical-cavity surface-emitting lasers (VCSELs) that incorporate fiber Fabry-Perot (FFP) optical cavities. These lasers have been...

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