• Home >
  • Back Issues >
  • Laser Focus World >
  • Volume 47, Issue 11

    • Volume 47, Issue 11

    More content from Volume 47, Issue 11

    (Courtesy of R. Ostendorf, Fraunhofer Institute)
    FIGURE 1. Laser diodes having broad-area gain regions and tapered gain regions both emit similar power. However, the tapered structure produces more uniform gain within the laser and more uniform output across the emitting facet, as shown on the left.
    High-power laser diodes excel in generating light efficiently, but they have fallen short in producing the high-quality beams needed for many applications. New laser designs, ...
    Nov. 1, 2011
    A group at East China Normal University has shown self-channeling filaments created by femtosecond-laser pulses can interact in air to form a 2D plasma grating that diffracts ...
    Nov. 1, 2011
    Distributed-Bragg-reflector gratings fabricated in II-VI semiconductor materials by researchers at the University of Bremen and the Romanian Academy could be the basis for future...
    Nov. 1, 2011
    FIGURE 1. Evaporative deposition produces porous coatings that can absorb moisture, while IAD reduces this problem and IBS completely eliminates it.
    Optical coatings for military applications often need to simultaneously satisfy many extreme requirements; coating manufacturers have responded with an array of design and fabrication...
    Nov. 1, 2011
    (Courtesy of University of Electronic Science & Technology of China for all images)
    FIGURE 1. A schematic shows a micromachining system that uses a 157 nm excimer laser.
    Directly engraved on silicon or sapphire fibers using a 157 nm laser micromachining system, highly accurate micro fiber-optic Fabry-Perot interferometric (MFFPI) sensors are well...
    Nov. 1, 2011
    FIGURE 1. Comparison of the data logs collected simultaneously by the Swept Sensor (blue trace) and the MIRAN SapphIRe (green trace). The gray shaded areas represent three background measurements during which the Swept Sensor was not monitoring the air in the surgery room.
    Known as a mid-IR tool for research or military applications, tunable quantum cascade laser-based systems are now available for spectroscopy applications that include detecting...
    Nov. 1, 2011
    FIGURE 1. a) A scanning-electron micrograph shows a probe tip. b) An optical pump/probe setup is used for terahertz time-domain measurements. c) A scale model of the probes shows the configuration and orientation used for the measurements.
    Terahertz imaging microprobes boost the accuracy of reflectometry-based fault location in silicon chips into the sub-micron range.
    Nov. 1, 2011
    FIGURE 1. Before (top) and after (bottom) images illustrate how the Alex TriVantage—which emits 532, 755, and 1064 nm laser light—removes tattoos (left; courtesy of Dr. G. Goldberg) and treats pigment lesions (right; courtesy of S. Kilmer).
    Aesthetic photonics for wrinkle and hair removal, eye and cosmetic surgery, and laser liposuction, just to name a few, are part of a growing aesthetic medical device business ...
    Nov. 1, 2011
    (Courtesy of JILA)
    In a tabletop soft x-ray coherent diffractive imaging system, a femtosecond laser pulse is focused into a gas-filled waveguide to produce coherent 13 nm high-harmonic beams. The resultant diffraction pattern produced by light diffracted from the sample is captured on a CCD camera and reconstructed into an image (inset) using an iterative phase-retrieval algorithm.
    Scientists and engineers are constantly working to improve nanometer-regime imaging technologies.
    Nov. 1, 2011
    A bulk heterojunction (BHJ) organic tricolor detector includes, from bottom to top, a blue Bragg reflector, an ITO-coated glass substrate, the BHJ, a layer of water and electrolyte, and a platinum-coated, ITO- or FPO-coated glass cover.
    A single layer of polymer in an optical sensor developed by researchers at the Jawaharlal Nehru Centre for Advanced Scientific Research can sense multiple colors without using...
    Nov. 1, 2011
    (Courtesy of Politecnico di Milano all images [3])
    FIGURE 1. The vertical cross-section (a) of a typical thin double epitaxial single-photon avalanche diode (SPAD) is contrasted with the cross-section of the active region of a thin SPAD (b) with a qualitative electric field profile for the multiplying space-charge region.
    A new planar structure for silicon single-photon-counting detectors leads to the doubling of detector efficiency while maintaining picosecond timing resolution, low dark counts...
    Nov. 1, 2011
    (Courtesy of the University of Connecticut and ODIS)
    A GaAs/AlGaAs quantum-well resonator forms the basis of a III-V semiconductor optical modulator with a rectangular waveguide structure (top). The POET modulator device is shown in cross section (bottom; shown at dashed line through top figure).
    Scientists and engineers from OPEL Technologies affiliate ODIS Inc. and its research and development center located at the University of Connecticut have developed a high-speed...
    Nov. 1, 2011
    (Courtesy of LightMachinery)
    The reflectivity of a 100-µm-thick solid fused-silica etalon varies widely with angle, making it suitable as the partially transmitting component of the UBS (top). A UBS mounted in a standard mirror mount splits a beam (path of beam is sketched in for clarity).
    In response to frequent requests for custom beamsplitters, the research and development staff at LightMachinery has developed an adjustable beamsplitter that the company calls...
    Nov. 1, 2011
    Conard Holton2
    The deep-ultraviolet wavelengths have been challenging detector makers for many years.
    Nov. 1, 2011
    As you probably know by now, the 2011 Nobel Prize for Physics has been awarded to three leading researchers in astrophysics-namely Dr. Saul Perlmutter, Dr. Brian Schmidt, and ...
    Nov. 1, 2011
    (Photo courtesy of Vilnius University Laser Research Center)
    FIGURE 1. Laser micromachining software should be capable of implementing various tasks, from glass marking (a) to 3D direct-laser writing (b).
    Software and hardware integration is critical for successful execution of diverse 2D and 3D laser micromachining tasks, including elimination of complex programming and implementation...
    Nov. 1, 2011
    1304qa Chang New
    You must switch your mindset from that of a researcher writing a grant proposal to that of a practical businessperson when you write a business plan.
    Nov. 1, 2011
    (Courtesy of Pusan National University)
    FIGURE 1. A schematic shows the steps used to create an integrated fiber Bragg grating (FBG)-based biosensor.
    A low-cost fiber-Bragg-grating (FBG)-based label-free optical biosensor with integrated microfluidic channels on a polydimethylsiloxane (PDMS) substrate can measure refractive...
    Oct. 20, 2011