Dual Focus Diffractive Optical Element with Extended Depth of Focus

作者：Uno Katsuhiro^*; Shimizu Isao

来源：Optical Review, 2014, 21(5): 668-675.

DOI：10.1007/s10043-014-0107-9

• dual focus lens
• extended depth of focus
• axilens
• daisy lens
• lotus lens

A dual focus property and an extended depth of focus were verified by a new type of diffractive lens displaying on liquid crystal on silicon (LCoS) devices. This type of lens is useful to read information on multilayer optical discs and tilted discs. The radial undulation of the phase groove on the diffractive lens gave the dual focus nature. The focal extension was performed by combining the dual focus lens with the axilens that was invented for expanding the depth of focus. The number of undulations did not affect the intensity along the optical axis but the central spot of the diffraction pattern.

• 出版日期2014-9