Title :
Light beam redistribution using computer-generated phase plates
Author :
Kawakami, Shojiro ; Ogawa, Osamu
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
9/1/1989 12:00:00 AM
Abstract :
The use of two phase plates for light-beam power redistribution is proposed. The first plate is designed so that the desired power distribution is obtained by near-field diffraction; the purpose of the second plate is the correction of the phase front. The deviation is based on ray optics, which is a good approximation in practical situations. As an example, design and fabrication of the phase plate for 1:2 branching of single-mode fibers are described. The phase plates have a computer-generated pattern and are fabricated by electron-beam lithography. Experimental verification of beam branching is presented
Keywords :
computer-generated holography; electron beam lithography; holographic optical elements; laser beams; lenses; light diffraction; optical elements; optical fibres; 1:2 branching; beam branching; computer-generated phase plates; electron-beam lithography; light-beam power; micro Fresnel lens; near-field diffraction; phase front detection; power distribution; ray optics; redistribution; single-mode fibers; Electron beams; Laser beams; Lenses; Lithography; Optical fiber networks; Optical fibers; Optical sensors; Optical waveguides; Power distribution; Shape;
Journal_Title :
Lightwave Technology, Journal of
