Advances in 3D fabrication have afforded new freedoms in the design of custom optical elements. We explore a design space where the refractive index may vary freely with position in a material by considering applications in coherent beam shaping. First, we will describe experimental results where we have used femtosecond laser writing to fabricate custom GRIN waveguides in a planar geometry. We show a 2D device that converts a Gaussian beam to a flat top in one transverse direction, and is a single-mode waveguide in the other. Second, we describe a numerical method for designing 3D refractive index profiles. As an example, we will use the 3D method to design a device that transforms a circular beam with a Gaussian intensity profile into a square beam with a flat top.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.