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Authors: Y. Fink and J.D. Joannopoulos

IRG-III Highlight : Multimaterial fiber controls the emission of laser light. b. a. Michael F. Rubner , Massachusetts Institute of Technology, DMR 0819762. Radial mode. 1 μm. Authors: Y. Fink and J.D. Joannopoulos. Laser cavity.

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Authors: Y. Fink and J.D. Joannopoulos

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  1. IRG-III Highlight: Multimaterial fiber controls the emission of laser light b a Michael F. Rubner, Massachusetts Institute of Technology, DMR 0819762 Radial mode 1 μm Authors: Y. Fink and J.D. Joannopoulos Laser cavity The problem of directing laser light is recognized as an important one for a variety of applications. Current solutions could be classified into ones that utilize moving mechanical parts and ones that rely on non-mechanical mechanisms. While having advantages such as high angular precision, the non-mechanical solutions are nevertheless constrained to a narrow angular range. Finkand Joannopouloshave developed a multimaterial fiber light source with the built-in function of controlling its emission around a full 360 degrees. This new capability, implemented monolithically within a single fiber, presents exciting opportunities ranging from flexible multidirectional displays to minimally invasive directed light delivery systems for medical applications. PBGstructure Polarization PBG structure c z z V2 = V1 = 0V 0V min max Linear polarizer 42V 42V LC1 LC2 s 99V 99V s V1 V2 30 µm z Pump beam LC2 LC1 A directionally controlled radial fiber laser. a. Schematic drawing of the radially emitting fiber laser structure and energy density plot for a high-Q TE0nfiber cavity laser mode. The outgoing, radially-directed red arrows denote the direction of laser emission. b. (left) SEM micrograph of the multimaterialfiber device. Four light modulators surround the fiber core. Each modulator consists of a hollow microchannel (filled post-draw with liquid crystals (LCs)) flanked by conductive polyethylene electrodes. (right) Zoom view of the multilayer structure forming the PBG cavity. The white and grey layers correspond to As25S75 and polycarbonate, respectively. c. (center) Schematic of the fiber device depicting the simultaneous laser intensity control transmitting through two oppositely facing LC-filled microchannels, labeled as LC1 and LC2. A.M. Stolyarov, L. Wei, O. Shapira, F. Sorin, S.L. Chua, J.D. Joannopoulos, Y. Fink, Nature Photon. Forthcoming (2012).

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