Dual layer digital versatile disk pickup integrating opto-electronic and diffractive elements

Summary form only. A pickup using an optoelectronic, nematic LC lens and two diffractive optical elements (DOEs) was designed and a demonstrator model built. It was successfully demonstrated that the LC lens could focus onto both layers of a dual layer DVD. Focus switching of below 10ms were achieved. The working principle and the fabrication methods of the DOEs and the design and working of the LC lens are described. Measurements of the integrated pickup using the astigmatism method are presented.