TAILIEUCHUNG - Polymer Thin Films Part 11

Tham khảo tài liệu 'polymer thin films part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 14 Micro nano scale phase front inscription on polymer thin layer for flexible beam shaping Jun Ki Kim1 and Kyunghwan Oh2 1Harvard medical school Massachusetts General Hospital 2Yonsei University Department of Physics Republic of Korea 1. Introduction As the demands for non-spherical lenses or diffractive optical devices have been increased much investigation efforts over Beam transforming and the wavefront control in optical technologies have been attempted. Thus novel and various technologies have been proposed in order to transform the shape and power distribution of a given light beam. Through waveguide-branching or phase front matching methods which were previously reported the controlling of either phase front curvature or power distributions had been achieved. However beam reshaping technique using these methods relied mainly on the use of bulk optical system which required complicated design and fabrication processes at the risk of system size as well as cost. Along with fast development in fiber optic communications and sensory systems various attempts in order to cope with these weaknesses have been made to incorporate the bulkoptic technique into optical fibers. Direct mechanical deformation of fiber ends into spherical or wedge-shaped surfaces have been attempted as one of first attempt in fiber optics for applications in laser-diode to optical fiber coupling. By utilizing conventional micro-lithography and etching techniques reflowing technique of photoresist on the fiber ends have been also attempted. However laser direct writing process over optical fiber endfaces suffers from not only sophisticated optical alignments and expensive femto-second laser systems but also surface damages after fabrication process. Recently the polymeric phase-front modification technique using optical fiber composition was investigated by the authors in order to overcome the disadvantages of described methods. As the proposed methods are suitable for beam forming .

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