Abstract

A new two-step approach for fabricating phase optical elements in photo-thermo-refractive glass by exposure to IR ultrashort laser pulses followed by thermal development is shown. A binary phase Fresnel lens was designed to focus light at 632.8nm to a focal length of 400cm. Conditions of ultrashort pulse irradiation and thermal development were chosen to achieve π phase shift between zone boundaries. The focusing efficiency of the element was measured to be close to 50%.

© 2008 Optical Society of America

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