Research On Hybrid Diffractive-Refractive Optical System With Long Focal Length And High Resolution

There have been rapid developments in the research of diffractive optics for the past decade. The combination of diffractive optical elements (DOES) and conventional refractive optical elements can give us a new generation of optical systems which are know as hybrid diffractive-refractive systems and have the advantages of light weight, high image quality, low cost, and so on over conventional optical systems.In chapter one of this master's thesis the development history of diffractive imaging optics and the limitation of conventional optical systems are reviewed. And from this the general research direction and the basic research scheme are determined. As a basis for the analysis of the following chapters the general method for handing light wave diffraction are introduced in chapter two. In chapter three the diffraction efficiency and the imaging properties of DOE'S are discussed. In chapter four conventional apochromatic principle and hybrid diffractive-refractive apochromatic principle are reviewed, and a conventional refractive apochromatic optical system and a hybrid diffractive-refractive apochromatic optical system are designed, and the advantages of the two design methods are analyzed and the third order spectrum of the two optical systems are discussed. In chapter five two hybrid diffractive-refractive apochromatic optical systems are designed, and causes between the two optical systems with different spherochromatic aberration are researched. Finally, a method of spherochromatic aberration correction of hybrid diffractive-refractive apochromats is presented.