Photonics/Optics

Frame Grabber

BitFlow (Woburn, MA) has announced the Neon- CLQ Quad, a Camera Link/PoCL frame grabber that provides interfaces for four cameras plus I/O. All four cameras can be synchronized or independently operated with different resolutions, frame rates, and triggering modes.

Posted in: Products, Products, ptb catchall, Photonics

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Laser Measurement Mobile App

Ophir Photonics (North Logan, UT) offers the Quasar App, a mobile application that displays laser meter data on Android devices or tablets. The Quasar App connects to Ophir’s Quasar device via Bluetooth. Once connected, the App displays power readings from the laser measurement sensor within a range of 10 meters.

Posted in: Products, Products, ptb catchall, Photonics

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Vacuum Spectrometer

The Model 248/310 grazing incidence spectrometer from McPherson (Chelmsford, MA) makes direct optical measurements from one to 300 nanometers. The device enables testing of soft x-ray (XUV) high energy light sources (plasma or laser) and samples. Life time, persistence, or decay can be measured with continuous spectral scanning.

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Light Source

The BluLoop Light Source from Ocean Optics (Dunedin, FL) is a compact, LED-based source with balanced spectral output across the visible (400-700 nm) range. When coupled to a miniature spectrometer, optical fibers, and sampling accessories, Blu- Loop can be used for color and reflectance measurements and general-purpose VIS-NIR spectroscopy. The four LEDs are individually tunable for balancing of the spectral output. BluLoop produces “flatter” spectral output in the visible range for more predictable response, especially for color analysis.

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Optical Communications Receiver

Specialized mixed-signal (radio frequency and digital) hardware and processing techniques are employed to enable processing of the multi-GHz signal bandwidth, along with the instruction of an inter-symbol guard time (ISGT) to facilitate synchronization to the received pulse-position modulation (PPM) signal.

Posted in: Briefs, ptb catchall, Tech Briefs, Photonics, Optics, Radio equipment, Telecommunications systems

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Low-Noise, Large-Area Quad Photoreceivers Based on Low-Capacitance Quad Photodiodes

The Laser Interferometry Space Antenna’s (LISAs) scientific mission to detect gravity waves demands stringent noise limits on the system components, especially the large-area quad photoreceiver front end, for ultra-high-precision (≈10 pm/Hz1/2) distance measurements. The optical LO (local oscillator) power on LISA is limited to 100 μW to keep power dissipation and thermal fluctuation low on the optical bench. Consequently, a large-area quad photoreceiver having an equivalent input current noise of the order of 1 pm/Hz1/2 is needed. Additionally, the quad photoreceiver must demonstrate low crosstalk between individual quadrants to allow accurate direction sensing of the incoming optical beam. This performance must be achieved over a bandwidth of 2 to 20 MHz to meet LISA’s requirements. Commercially available quad photodetectors do not have the combination of large area, low capacitance (and therefore low noise), and low crosstalk, which is critical for LISA’s scientific objectives.

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics, Physical Sciences, Antennas, Lasers, Noise

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Wavefront Sensing Analysis of Grazing Incidence Optical Systems

As a metrology tool, this method allows integration of high-angular-resolution optics without the use of normal incidence interferometry. Wavefront sensing is a process by which optical system errors are deduced from the aberrations in the image of an ideal source. The method has been used successfully in near-normal incidence, but not for grazing incidence systems. This innovation highlights the ability to examine outof- focus images from grazing incidence telescopes (typically operating in the x-ray wavelengths, but integrated using optical wavelengths) and determine the lower-order deformations. This is important because as a metrology tool, this method would allow the integration of high angular resolution optics without the use of normal incidence interferometry, which requires direct access to the front surface of each mirror.

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Information Sciences, Photonics, Failure analysis, Imaging and visualization, Optics

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