Design Of Modern Infrared Optical System

With the requirements of modern military-optics and space-optics, several modern infrared optical systems are studied. The emphasis is on the athermalization of the infrared optical systems. Some important works are as follows:(1) Design of refractive infrared athermal optical system. The thermal properties in refractive infrared system are described. The temperature effects of the refractive infrared system are analyzed. The emphasis is focus on the design of the single-band refractive infrared system. Several practical athermal systems are designed, including the two touched lens athermal MWIR systems, the three touched lens athermal MWIR systems, and two touched lens athermal LWIR systems, the three touched lens athermal LWIR systems, and an athermal infrared Petzval optical system beyond normal temperature.(2) Design of hybrid refractive-diffractive infrared athermal optical system. The image properties of DOE are studied. The phase and the optical power of DOE are analyzed. The dispersive characteristics of DOE are described. The thermal properties of the DOE are discussed. An athermal and apochromatic hybrid diffractive-refractive system beyond normal temperature is designed. The results show the imaging quality is stable in the whole temperature range and is near the diffraction-limitation. The longitudinal aberrations are well corrected.(3) Design of infrared Dual-band athermal optical system. The methods of refractive infrared Dual-band athermal optical system are discussed. An example is given. The spectral properties, including the image properties, athermal properties, achromatism and diffraction efficiency, are studied. Based on these characteristics, a design of dual-band infrared harmonic diffractive-refractive optical system is given. The results show the imaging quality is near the diffraction-limitation and is stable. The designed system possesses good athermal and achromatic ability.(4) Design of off-axis three-mirror reflective optical system. Two methods to obtain the parameters of initial structure are introduced. On the analysis of the traditional method to obtain the parameters of the initial structure, the emphasis is put on the discussion of their parameter range of three different initial structures. Two off-axis forms are studied. With the form without intermediate image plane, three design examples are designed. Results show the imaging quality is near the diffraction-limitation in visible spectrum and arrived in infrared spectrum. So the off-axis three-mirror reflective is able to work in the multi-band from the visible spectral region to infrared range.