Photonics/Optics

Laser Diode Market Stays Hot in 2007

The high-power laser diode market has grown rapidly in the last twelve months, a trend that is set to continue throughout 2006 and beyond. The global market for laser systems is forecast to grow by 8% in 2006 to US $5.9 billion, with diode lasers alone growing by 8%.

Posted in: Articles, Features, ptb catchall, Photonics, Lasers, Market research
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Optical Software in ‘07: Isn’t that Easy?

Optical software programs provide optical designers with the means to predict and analyze performance characteristics of optical systems without experimental prototyping. Looking ahead into 2007, optical software will continue to enhance optical design capabilities in several ways. Optical software developers are concentrating their efforts on improving communication channels between engineers in disparate fields who are asked to collaborate. In a word, the direction is “inter-operability.”

Posted in: Articles, Features, ptb catchall, Photonics, CAD, CAM, and CAE, Optics, Collaboration and partnering
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Holographic Plossl Retroreflectors

Lightweight, inexpensive holographic optical elements would be used in place of lenses.

Holographic retroreflectors that function equivalently to Plossl eyepieces have been developed and used in free-space optical communication systems that utilize laser beams. Plossl eyepieces are well known among telescope designers. They have been adopted for use as retroreflectors and as focusing elements (for reception) and collimating elements (for transmission) in optical communication systems. A retroreflector that incorporates a Plossl eyepiece is termed a cat’s eye retroreflector (see figure).

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics, Lasers, Optics, Telecommunications
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High-Speed Laser Scanner Maps a Surface in Three Dimensions

Surface flaws can be scanned automatically and displayed in real time.

A scanning optoelectronic instrument generates the digital equivalent of a three-dimensional (X,Y,Z) map of a surface that spans an area with resolution on the order of 0.005 in. (≈0.125mm). Originally intended for characterizing surface flaws (e.g., pits) on space-shuttle thermal-insulation tiles, the instrument could just as well be used for similar purposes in other settings in which there are requirements to inspect the surfaces of many objects. While many commercial instruments can perform this surface-inspection function, the present instrument offers a unique combination of capabilities not available in commercial instruments.

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics, Measurements, Lasers, Optics, Inspections
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MALDI and Biotech Push Nitrogen Laser Development

The nitrogen laser is experiencing new growth due to low cost and the MALDI technique.

The Matrix Assisted Laser Desorption and Ionization (MALDI) technique in 1987 led to a renewed interest for the nitrogen laser. MALDI allows large and fragile biomolecules to be desorbed and ionized intact, or with much less fragmentation. The technique increased the upper mass limit for mass spectrometric analyses of biomolecules to over 300,000 Da, and has enabled the analysis of large biomolecules by mass spectrometry to become easier and more sensitive.

Posted in: Briefs, ptb catchall, Tech Briefs, Photonics, Lasers
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Electro-Optical Imaging Fourier-Transform Spectrometer

Size, weight, and vibration are reduced by eliminating moving parts.

An electro-optical (E-O) imaging Fourier-transform spectrometer (IFTS), now under development, is a prototype of improved imaging spectrometers to be used for hyperspectral imaging, especially in the infrared spectral region. Unlike both imaging and non-imaging traditional Fourier-transform spectrometers, the E-O IFTS does not contain any moving parts. Elimination of the moving parts and the associated actuator mechanisms and supporting structures would increase reliability while enabling reductions in size and mass, relative to traditional Fourier-transform spectrometers that offer equivalent capabilities. Elimination of moving parts would also eliminate the vibrations caused by the motions of those parts.

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics, Imaging and visualization, Test equipment and instrumentation
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Glass Molding Makes High-Quality Aspheres Cost Effective

High-resolution digital imaging, low-light-level biomedical devices, and automotive sensing are just a few of today’s hot technologies demanding both low-cost and high-performance optical systems. Critical in this effort is the mid- and high-volume requirement for aspheric optical components. Unfortunately, CNC polishing methods are expensive and take too long to produce each component, which has pushed precision glass molding to the front of asphere manufacturing technologies.

Posted in: Articles, Features, ptb catchall, Photonics, Imaging and visualization, Medical equipment and supplies, Glass
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New Metals, Optics, Tools, and Processes Focus on Satellite Imaging

Lightweight, aspheric, reflective optical designs commonly are designed and built for demanding space-based remote sensing, targeting systems, and aerial reconnaissance. Traditional designs utilizing low expansion optical glasses steadily are giving way to metals such as aluminum, beryllium, and AlBeMet, and ceramics such as silicon carbide. These materials can be produced in extremely lightweight, yet robust and athermalized, designs by virtue of their superior tensile strength, fracture toughness, and the ability to compose support structures and mirrors from identical materials.

Posted in: Articles, Features, ptb catchall, Photonics, Mirrors, Optics, Remote sensing, Surveillance, Metals, Satellites
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Thermal Light Valve Brings IR Imaging to the Masses

Technology uses MEMS structure with refractive properties sensitive to thermal radiation and reads out signal with inexpensive laser diode and CMOS sensor.

RedShift Systems, Waltham, Massachusetts

The desire to “see” in complete darkness or through obscurants such as smoke or fog has driven the development and adoption of thermal imaging technology. Thermal imaging is the translation of a scene’s heat signature — the 8-μm to 14-μm or long-wavelength infrared (LWIR) energy an object emits — into a visible image or data that can be interpreted by a computer.

Posted in: Briefs, ptb catchall, Tech Briefs, Photonics
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Optically Driven Deformable Mirrors

There is no wiring on the back sides of these mirrors.

Optically driven deformable mirrors may eventually supplant electrically driven deformable mirrors in some adaptive-optics and active-optics applications. Traditionally, the mirror facets in electrically driven deformable mirrors are actuated, variously, by means of piezoelectric, electrostrictive, microelectromechanical, liquid-crystal, or thermal devices. At least one such device must be dedicated to each facet, and there must be at least one wire carrying a control or drive signal to the device. If a deformable mirror comprises many (e.g., thousands) of facets, then wiring becomes a major problem for design, and the problem is compounded in cases of piezoelectric or other actuators for which high drive voltages are required. In contrast, in optically driven mirrors, the wiring problem is eliminated.

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics, Mirrors, Wiring
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