Study on formation of hot image in focusing systems

Abstract

The evolution of hot-image formation in consideration of focusing lens effect is theoretically and numerically investigated. Through analysis of linear propagation theory with lens, it is shown that the location of hot image in focusing systems can be predicated through definite functional relation to hot image position in non-focusing systems, on condition that the distance between the hot image and the lens is relatively small. In addition through numerical calculation, specific variation characteristics of maximum intensity with the propagation distance representing hot-image formation process are presented, it is obtained that perturbing scatter size directly affects the location and corresponding peak intensity of the hot image. The lens influences the value of scatter size where minimum distance between hot-image plane and focus lens is generated. Finally, the effects of phase and amplitude modulation of scatter on hot image are also given. Results in this paper are of fair referenced value for controlling perturbing scatter and restraining the damage risk of optical components in focusing systems.