High focal depth with a pure-phase apodizer.
نویسندگان
چکیده
High-density optical data storage requires high-numerical-aperture (NA) lenses and short wavelengths. But, with increasing NA and decreasing wavelength, the depth of focus (DOF) decreases rapidly. We propose to use pure-phase superresolution apodizers to optimize the axial intensity distribution and extend the DOF of an optical pickup. With this kind of apodizer, the expected DOF can be 2-4.88 times greater than that of the original system, and the spot size will be smaller than that of the original system.
منابع مشابه
Phase-shifting apodizers for increasing focal depth.
We propose the use of a phase-shifting apodizers to increase focal depth, and we study the axial and radial behavior of this kind of apodizer under the condition that the axial intensity distribution is optimized for high focal depth.
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ورودعنوان ژورنال:
- Applied optics
دوره 40 31 شماره
صفحات -
تاریخ انتشار 2001