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Laser Focus World www.laserfocusworld.com February 2016 Photonics Technologies & Solutions for Technical Professionals Worldwide Multiple laser beam materials processing PAGE 27 Automating fiber Bragg grating fabrication PAGE 31 Handheld spectrometers shrink and grow PAGE 35 Modeling waveguide- based optics PAGE 43 ® MIR optical biopsy, photoacoustic imaging PAGE 47 1602lfw_C1 1 2/4/16 11:46 AM 1602lfw_C2 2 2/4/16 11:46 AM One Source Infinite Possibilities Optical fiber performance you can count on: Discover new resources Connect globally Explore land, sea and space Manufacture with precision Defend your homeland And most importantly, save lives Working with our customers to make a difference. Contact us at [email protected] or visit us at www.nufern.com 866.466.0214 / www.nufern.com OPTICAL FIBERS | FIBER LASERS & AMPLIFIERS | FIBER GYRO COILS | DEFENSE TECHNOLOGY 1602lfw_1 1 2/4/16 11:43 AM Photonics Technologies & Solutions for Technical FEBRUARY 2016 ■ VOL. 52, NO. 2 Professionals Worldwide newsbreaks world news 9 13 Liquid-crystal Displays Backlight plate for LCDs produces Newport’s PV Lab provides NREL-supported polarized light, boosting efficiency solar cell testing 14 Nanolithography Laser bubble-pen lithography patterns colloidal nanoparticles Two ultrafast beams with 29.8 fs pulses are coherently combined 10 17 Optical Sensing Absorption/fluorescence could enable UV cavity-enhanced absorption spectros- gold nanoparticle detection at drill sites copy detects 2 ps transients columns departments 7 THE EDITOR’S DESK 68 BUSINESS FORUM 59 NEW PRODUCTS 67 ADVERTISING/WEB Lasers and light sources Part 2: Taiwan embraces INDEX keep finding new markets photonics as regional 62 BUSINESS W. Conard Holton competition intensifies RESOURCE CENTER 67 SALES OFFICES Associate Publisher/Chief Editor Milton Chang 63 MANUFACTURERS’ 20 FUTURE OPTICS PRODUCT Optical design and SHOWCASE testing trends—better, faster, cheaper Daniel Malacara-Hernández LASERS ■ OPTICS ■ DETECTORS ■ IMAGING ■ FIBER OPTICS ■ INSTRUMENTATION 2 February 2016 www.laserfocusworld.com Laser Focus World 1602lfw_REV_2 2 2/5/16 9:52 AM LFW on the Web Visit www.laserfocusworld.com for breaking news and Web-exclusive articles features 22 Photonic Frontiers: 31 Optics Fabrication Light-emitting Diodes Fiber Bragg grating fabrication LEDs are workhorses system is automated 27 COVER STORY with applications far An interference lithography based Trifocal brazing involves beyond lighting production system enables pushbutton two lead beams that Deep-UV LEDs could power new clean and pre-heat steel fabrication of fiber Bragg gratings edge surfaces to promote water-quality monitoring networks, (FBGs) for remote fiber sensing. wetting. (Courtesy of IPG near-UV LEDs cure adhesives and Ralph Delmdahl and Kristian Buchwald Photonics) inks, micro-LEDs open doors for optogenetic research, and direct- 35 Photonics Products: bandgap GeSn LEDs can be fabricated Handheld Spectrometers on silicon. Jeff Hecht How spectrometers have shrunk and grown since 2010 27 Fiber Lasers In 2010, Laser Focus World profiled Multiple laser beam a number of handheld spectrometer materials processing designs and their myriad applications. Fiber lasers producing different spot More than five years later, they sizes, pulse durations, or wavelengths continue to shrink in size and/or weight, can be combined into a single yet grow in variety and performance process for applications such as to expand the sphere of applications brazing, welding, and surface texturing. served. Gail Overton Coming Toby Strite, Andreas Gusenko, Michael Grupp, in March and Tony Hoult 43 Simulation and Modeling Computational photonics models waveguide- Next month includes special based optics articles to highlight what’s This overview of available options hot in many important for the numerical modeling of light areas: propagation in integrated photonic • Contributing editor Jeff structures aims at matching the user Hecht continues his with the proper software for the job. Photonic Frontiers series Marek S. Wartak by discussing optical LASER FOCUS WORLD PRESENTS communication beyond 100 Gbits/s. • Articles on new silicon photonics designs, ® high-power fiber lasers, 47 Editor’s Column laser light shows, Thanks, OSA! 50 Moving toward MIR optical molded optics, and Barbara Gefvert biopsy ultrafast sampling for Editor in Chief, BioOptics World Angela B. Seddon, Bruce Napier, Ian Lindsay, time-domain Samir Lamrini, Peter M. Moselund, Nick Stone, spectroscopy. and Ole Bang 48 BioOptics News & Breakthroughs In BioOptics World, we will have articles on near- 54 The wide-ranging infrared deep-tissue benefit of photoacoustic imaging and Raman commercialization spectroscopy. Kathy Kincade Laser Focus World www.laserfocusworld.com February 2016 3 1602lfw_3 3 2/4/16 11:44 AM SMART Laser Solutions Ball Lens Polyimide Coated Fiber Fiber Combiners PCF Controlled Collapse 320 μm with 125 μm Spliced Stripped with PCS-100 to 80 μm Fiber AFL has a global reputation for bringing best-in-class technology and design concepts to the market. With vertically integrated operations and manufacturing capabilities, AFL can meet evolving customer requirements in highly technical markets by providing custom engineering services for special splicing or fiber preparation applications. • Fabricated Splice Component Design • Process Improvement Consultation • Component Contract Manufacturing • Advanced Glass Processing Training • Custom Hardware/Software Design www.AFLglobal.com 864.486.7125 [email protected] 1602lfw_4 4 2/4/16 11:44 AM 1602lfw_6 6 2/4/16 11:44 AM editor’s desk Lasers and light sources keep finding new markets Since the dawn of the 21st century, fiber lasers have been the fastest growing segment of the laser mar- kets, adopted into applications ranging from biomedicine to defense and research. The market where the technology has had the greatest impact by far is industrial materials processing, where Strategies Unlimited estimates that fiber laser sales revenue grew 22% in 2015. Automotive manufacturers in par- ticular have become comfortable with fiber lasers and willing to embrace advanced processes that im- prove productivity, as engineers from IPG Photonics explain in our cover story about using multiple laser beams in a single process for applications such as brazing, welding, and surface texturing (see page 27). One product area where fiber lasers have not had an impact is handheld spectrometers, where the light source is more likely a laser diode or quantum cascade laser. As Senior Editor Gail Overton writes in this month’s Photonics Products article, handheld spectrometer designs have continued to shrink in size and/or weight, while increasing in variety and performance (see page 35). The competition and choices have significantly grown in recent years, but the advantages this new generation of spectrometers pro- vides are significant for research, process control, and security. The light-emitting diode (LED), often thought of as little more than a light source for displays or il- lumination, is also penetrating important new markets. Ultraviolet LEDs can monitor water and cure ad- hesives and inks, micro-LEDs can be used in optogenetics, and GeSn LEDs, fabricated on silicon, could make their way into silicon photonic devices—all new applications that contributing editor Jeff Hecht Conard Holton describes in his Photonic Frontiers feature (see page 22). Associate Publisher/ Two other new applications described in this issue rely on innovations in lasers for biophotonics— Editor in Chief mid-infrared optical biopsy and photoacoustic imaging. The great thing about covering photonics is that [email protected] I can use the word “new” frequently, and still be very accurate. Alan Bergstein Group Publisher, (603) 891-9447; [email protected] EDITORIAL ADVISORY BOARD Conard Holton Editor in Chief, (603) 891-9161; [email protected] Stephen G. Anderson, SPIE; Gail Overton Senior Editor, (603) 305-4756; [email protected] www.pennwell.com Dan Botez, University of Wisconsin- John Wallace Senior Editor, (603) 891-9228; [email protected] Madison; Walter Burgess, Power EDITORIAL OFFICES Lee Dubay Associate Editor, (603) 891-9116; [email protected] Technology; Connie Chang-Hasnain, Laser Focus World UC Berkeley Center for Opto-electronic CONTRIBUTING EDITORS PennWell Corporation Nanostructured Semiconductor 61 Spit Brook Road, Suite 401, Nashua, NH 03060 Technologies; Pat Edsell, Avanex; David A. Belforte Editor in Chief, Industrial Laser Solutions, (603) 891-0123; fax (603) 891-0574 Jason Eichenholz, Open Photonics; (508) 347-9324; [email protected] www.laserfocusworld.com Thomas Giallorenzi, Naval Research Barbara Gefvert Editor in Chief, BioOptics World, Laboratory; Ron Gibbs, Ron Gibbs (603) 891-9194; [email protected] CORPORATE OFFICERS Associates; Anthony M. Johnson, Jeff Hecht Photonic Frontiers, (617) 965-3834; [email protected] Center for Advanced Studies in Robert F. Biolchini Chairman Photonics Research, University of Meg Fuschetti Editorial Creative Director Frank T. Lauinger Vice Chairman Maryland Baltimore County; Sheila Ward Production Manager Mark C. Wilmoth President and Chief Kenneth Kaufmann, Hamamatsu Chris Hipp Senior Illustrator Executive Officer Corp.; Larry Marshall, Southern Cross Venture Partners; Jan Melles, Gillian Hinkle Marketing Manager Jayne A. Gilsinger Executive Vice President, Photonics Investments; Debbie Bouley Audience Development Manager Corporate Development and Strategy Masahiro Joe Nagasawa, TEM Co. Ltd.;
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