Special Coverage

Self-Healing Wire Insulation
Thermomechanical Methodology for Stabilizing Shape Memory Alloy (SMA) Response
Space Optical Communications Using Laser Beams
High Field Superconducting Magnets
Active Response Gravity Offload and Method
Strat-X
Sonar Inspection Robot System
Home

Narrow-Band WGM Optical Filters With Tunable FSRs

Microwave signals generated by optoelectronic oscillators can be tuned. NASA’s Jet Propulsion Laboratory, Pasadena, California Optical resonators of the whispering-gallery-mode (WGM) type featuring DC-tunable free spectral ranges (FSRs) have been demonstrated. Previously, the FSRs of WGM optical resonators were determined solely by the resonator geometries and materials: hence, the FSR of such a resonator could be tailored by design, but once the resonator was constructed, its FSR was fixed. By making the FSR tunable, one makes it possible to adjust, during operation, the frequency of a microwave signal generated by an optoelectronic oscillator in which an WGM optical resonator is utilized as a narrow-band filter.

Posted in: Briefs, ptb catchall, Tech Briefs, Photonics

Read More >>

Digital Beam Deflectors Based Partly on Liquid Crystals

Laser beams are switched to different directions, without using solid moving parts. John H. Glenn Research Center, Cleveland, Ohio A digital beam deflector based partly on liquid crystals has been demonstrated as a prototype of a class of optical beam-steering devices that contain no mechanical actuators or solid moving parts. Such beam-steering devices could be useful in a variety of applications, including free-space optical communications, switching in fiber-optic communications, general optical switching, and optical scanning. Liquid crystals are of special interest as active materials in nonmechanical beam steerers and deflectors because of their structural flexibility, low operating voltages, and the relatively low costs of fabrication of devices that contain them. Recent advances in synthesis of liquid-crystal materials and design of the nematic-liquid-crystal cells have resulted in significant improvements in properties (e.g., short response times and birefringence) that are important for effective beam steering.

Posted in: Briefs, ptb catchall, Tech Briefs, Photonics

Read More >>

Product of the Month: Spectrograph Software

HORIBA Jobin Yvon (Edison, NJ) released the LS5 software, designed with a kernel-based modular structure. It operates all Raman products including the automated LabRAM ARAMIS, high-resolution LabRAM HR, and T64000 triple spectrograph. It incorporates custom accessories such as FT-IR, mapping, temperature-controlled stages, and additional detectors (all of which can be retrofitted). The software records Raman images in any shape or format. A range of data-processing tools is available to monitor the intensity of the marker band, perform multivariate chemometrics analysis, or provide a gateway to stand-alone, dedicated chemical-imaging data-processing software.

Posted in: Products, Products

Read More >>

Photoelectric Sensor

The OptoproxTM from Balluff, Inc. (Florence, KY) is a photoelectric sensor that offers the mounting, aligning, and handling of an inductive proximity sensor without the range limitations of a prox. The device has a focused red light beam with a fixed sensing range up to 23 mm. Applications include presence sensing, exact background suppression, positioning, controlling, and monitoring of discrete and process automation sequences. The device may target very small objects and sense black plastic, metal, and rubber parts.

Posted in: Products, Products

Read More >>

Photodetector Amplifier

Opto Diode Corp. (Newbury Park, CA) offers the ODA-5W-100M Photodetector Amplifier Combination with 100 Mohm gain. The visible wavelength responsivity at 660 nm is 40 V/μW, and the combination detector-preamps frequency response is 1 KHz with low dark offset at ±1 mV with dark offset noise at 5 mV RMS. Operating specifications are at ±15 V, 25°C. The active area is 0.100" diameter, and different gains are available. The detector is packaged in a standard TO-5 can, allowing for ease-of-integration and suitability for fluorescence, spectroscopy, and low-light-level tasks.

Posted in: Products, Products

Read More >>

Scanner Platform

The LightningTM Digital Scanner Platform Technology from General Scanning (Billerica, MA) consists of three elements: MPower motors, a Lightning digital servo driver, and the TuneMasterTM software toolset. The MPower Scanner motor design integrates the mirror, mount, and motor for inertial balance. The motor configuration augments operating efficiency and power transfer to the load, while heat build-up is minimized. The servo driver is based on 16-bit digital technology and features thermal stability, monitoring, and diagnostics. The TuneMasterTM ensures tunes for both axes remain matched during an application.

Posted in: Products, Products

Read More >>

Laser-Induced Breakdown Spectroscopy

Ocean Optics (Dunedin, FL) introduced the portable LIBS2500 laser-induced breakdown spectroscopy system featuring a sensitivity of 10-50 ppm; a series of 2,048-element, linear CCD detectors; and a seven-fiber optical sampling probe with a 74-UV collimating lens and a sampling lens. The system incorporates up to seven high-resolution spectrometers for spectral coverage from 200-980 nm, and operates with any 32-bit, USB-compatible Windows PC over a USB 1.1 or 2.0 interface. Integral software fires the laser and identifies the element being analyzed, performing element identification, reference correlation, time-dependent analysis, and line tracking over multiple samples.

Posted in: Products, Products

Read More >>

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.