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Fiber Lasers: Continuing to Power Growth
Bryce Samson, IPG Photonics Corporation
Early fiber lasers were inefficient and limited to low powers, until more effective methods emerged to deliver the pump light into the cladding. Valentin Gapontsev, founder and CEO of IPG Photonics,...
Nanopositioning: A Step Ahead
Scott Jordan, Brian Lula, and Stefan Vorndran, PI (Physik Instrumente) LP
By its original definition, a nanopositioning device is a mechanism capable of repeatedly delivering motion in increments as small as one nanometer. Lately demands from industry and research have...
Selecting a Photodetector: Using WITS$ as a Rough Guide
Earl Hergert and Slawomir Piatek, Hamamatsu Corporation
Light is a versatile tool for investigating physical and chemical processes in nature. Any specific system being analyzed may, through the light it emits or reflects, communicate information about...
Spectroscopy: The Tools of the Trade
Dr. John R. Gilchrist, Clyde HSI
All optical spectrometry techniques rely on the measurement of radiant power. The configuration of the instrument varies based on the measurement technique: absorption, emission, luminescence, or...
Detector Arrays: Taming the Irregular Shape Problem
Gerald C. Holst, JCD Publishing
If we were to estimate the output of a CCD or thermal camera, we would typically draw an image over the detectors, aligning the image with the detector axes. We show it this way because it’s...
Digital Still Cameras: The Changing Face of Imaging
Morio Onoe, Professor Emeritus, University of Tokyo
The digital camera represents an integration of optics, mechanics and electronics consisting of three layers (Figures 1a, b and c). The top and the middle layers are printed circuit boards (PCBs),...
OTDRs: Finding the Weak Spots in Fiber Links
Michel Leclerc and Vincent Racine, EXFO
An optical time-domain reflectometer sends short pulses of light into a fiber and measures its reflections as a function of time. The delay of these reflections to the detector as well as their...
Image Intensification: The Technology of Night Vision
Harry P. Montoro, ITT Night Vision
Image intensification, the basis of night vision, is a complex conversion of energy particles that occurs within a vacuum tube. An image-intensifier system works by collecting photons through an...
Detectors: CCDs for Life-Science Applications
Butch Moomaw, Hamamatsu Corporation, Systems Div.
Since their invention in the late 1960s, charge-coupled devices, also called CCDs, have found widespread use in imaging applications. Electronic cameras based on CCD technology are used in...
Characterizing High-Speed Transmitters: The Emphasis Is on Waveforms
Greg D. Le Cheminant, Agilent Technologies
An indicator of how well the entire system performs is a measurement called bit-error-ratio (BER). Acceptable BERs range from one error per billion to one per trillion bits transmitted. It is rare...
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