Hollow Laser Beam Control Experiments

Laser technology is one of the inventions which is a significant impact on human society. Laser technology promotes science and technology to enter a new stage of development with its unique technical advantages, it has shown the development of solid-state, market-oriented, diversified and so on in recent years. In this background, people pay more attention to the generation and application of the hollow laser technology. Hollow laser beam has shown the enormous potential in communications, information processing, laser processing, biotechnology, medicine, atomic, molecular science and other areas with its unique nature, and has a wide range of applications in biology and related fields. However, nobody is interested in the field of the scan imaging, remote sensing control and etc.This thesis studies the low of control of the hollow beam in-deep which based on the study of the fundamental nature of the hollow beam. Due to the particularity of the hollow laser beam, such as there are the inner cone angle and outer cone angle within the hollow cone-beam angle, when the hollow beam is controlled by the lens we should consider the control of the inner cone angle and outer cone angle at the same time. While as the hollow beam in the process of the dissemination, it will be a convergence to the center through some distance dissemination, it occurs hollow phenomenon disappears in a remote place. All those problems make the process of control becomes complicated and difficult to achieve.In this paper, we use the system of a pyramid is composed of positive and negative axis optical and the telescope zoom optical system as a combination to achieve researching the of controlling hollow cone angle of laser beam. And have been achieved the conditions which controlled the sensitivity of hollow beam cone angle. We has the relationship curve which is given the change in component interval and cone angle, and the data obtained are located in the vicinity of theoretical curves through laboratory tests, which show good agreement with the practical and theoretical, indicating that the theoretical we derived is correct. So we have laid a solid theoretical basis in the fast-scan imaging, the control of remote sensing and other areas through controlling the hollow cone angle of sensitivity for the hollow-laser beam.