| Popis: |
In this chapter, we revisit the basic principles, behind the pioneering efforts for implementing varifocal lenses, as a good example of wavefront engineering. Next, we define the concept of phase conjugated pairs (PCP), which is applied for linking varifocal lenses with the phase masks employed for reducing the impact of focus error on the MTF, as is discussed in Chap. 6. This definition will help us to achieve our current goal of discussing the main features of wavefront engineering. We will note, without further discussion, the remarkable developments in active optics; as well as the emerging, and competing, technologies for offering reliable varifocal lenses. We kindly remain our readers that we are preparing ourselves for designing nonconventional optical systems, by exploiting any sort of wavefront shaping devices. |
