High-power optics and its new manifestations

Abstract

The advent of the laser has placed stringent requirements on the fabrication, performance and quality of optical elements employed within systems for most practical applications. Their high power performance is generally governed by three distinct steps, firstly the absorption of incident optical radiation (governed primarily by various absorption mechanisms); secondly, followed by a temperature increase and response governed primarily by thermal properties and finally the elements thermo-optical and thermomechanical response, e.g., distortion, stress birefringenous fracture, etc. All of which needs to be understood in the design as efficient, compact, reliable and useful for many applications high power systems, under a variety of operating conditions, pulsed and continuous wave, rep-rated or burst mode of varying duty cycles.

High Power Lasers as a Weapon

“…Besides, there arises also a 'childish' question: If the laser beam can be focused and directed by a mirror, why cannot the same mirror protect us from the laser beam? In lasers use is usually made of multilayer dielectric mirrors that can reflect very much-but in a very narrow range and only under strictly defined angles [5]. In addition, they are cooled, which is impossible to do with the entire surface of the target.…”

Research on a quality detection system of dust suppression spraying for railway coal transportation using laser backscattering technology

“…There are many solutions to prevent the coal from spilling in railway transportation, including container method, machinery capping method, tarpaulin covering method, spraying bonding dust suppression method, etc. Container and machinery capping methods have failed to be applied on a large scale due to their high costs [3]. A tarpaulin covering method requires 4-5 people to realize the coverage of a carriage, which is of low efficiency [4].…”

Heat Transfer and Thermal Deformation Characteristics of Liquid-Cooled Laser Mirror

“…Water-cooled mirror, employing heat sinks with mini/ microchannels or micropores for cooling, is an effective way to limit the thermal distortion of mirror surface [1,2]. However, the thermal deformation characteristic of watercooled mirror is closely related to the geometric dimension, channel shape, configuration, inlet/outlet arrangement, and material [3].…”