Gain Of The Optical System In A Wide Field Of View

Laser weapons and their countermeasures are more important on modern battlefield, and IFF (Identification between Friend or Foe) system using laser technology is useful to gain victories. Traditional laser IFF has poor security because of low frequency of laser beam coded pulse. This can be greatly improved when the pulses are modulated by continuous wave laser, but the power of this laser beam output is so low that it's difficult to be detected and received by laser warning subsystem.In this thesis, wide-FOV (field-of-view) optical systems with optical gain based on FOV and optical gain of laser detection and warning optical system are studied. It can solve the problem of wide FOV matching with small photosensitive surface, enhance the power received, increase detecting sensitivity, reduce the power of laser and decrease the cost of laser accordingly.Firstly, the work principle of staring laser detection optical system is introduced, and the relation between optical antenna's amount and FOV in laser warning system of optical antenna array is deduced.Secondly, basic design project of wide-FOV optical system with optical gain is proposed after the optical gain of typical wide-FOV optical unit with optical gain has been analyzed and the infrared optical material has been selected. Then the structure of optical system is optimized and analyzed with optical design software.Two kinds of improved design project are proposed: retrofocus project and image telecentric project. Original structures are solved through gauss optics and primary aberration principle, and the aberration is optimized and analyzed too. To form staring Opto-Electronic countermeasure device, distributing of optical unit array is simply analyzed in the end.In the retrofocus project, a retrofocus structure with two elements is used in the object lens to enlarge FOV and back working distance, in the head of which the negative meniscus have the effect of balancing aberration and deviating rays like a prism. And a standard hyperhemisphere immersion lens with high refractive index is put behind the object lens to satisfy the receiving of a detector with smaller photosensitive...