A Brief Overview of Wireless Power Transfer Techniques <s> Laser Assisted Wireless Power Transfer <s> A new method for providing power to space consists of using high-power cw lasers on the ground to beam power to photovoltaic receivers in space. Such large lasers could be located at cloud-free sites at one or more ground locations, and use large mirrors with adaptive optical correction to reduce the beam spread due to diffraction or atmospheric turbulence. This can result in lower requirements for battery storage, due to continuous illumination of arrays even during periods of shadow by the Earth, and higher power output, due to the higher efficiency of photovoltaic arrays under laser illumination compared to solar and the ability to achieve higher intensities of illumination. Applications include providing power for satellites during eclipse, providing power to resurrect satellites which are failing due to solar array degradation, powering orbital transfer vehicles or lunar transfer shuttles, and providing night power to a solar array on the moon.© (1994) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. <s> BIB001 </s> A Brief Overview of Wireless Power Transfer Techniques <s> Laser Assisted Wireless Power Transfer <s> The aim of this paper is to give an overview of Wireless power transmission Technologies, such technologies were increasing as the applications of mobile devices, because these devices requires frequent recharging and wired connection limits its immovability, so the significance of mobile is totally lost. In easy manner the transmission of electric power is done with the help of wires. In this paper I am presenting the concept of cable less transmission of power, i.e. transmitting power without using any wires. <s> BIB002
This method is similar in concept to the generation of electricity via solar cells, whereby solar energy from the sun gets converted into electricity. However, in this method the source of light will be a laser that beams photons across a distance to a receiving unit. Photons emerging from the laser diverge as the distance between transmitter and receiver increases, and so to focus the beam onto a narrow spot, the photons are made to pass through converging lenses as they travel towards their destination BIB001 . The receiving system is composed of a group of photovoltaic cells designed to convert light of a particular wavelength into electricity to energize a load connected at the output stage of the photovoltaic cells BIB001 . As shown in figure 2, laser power beaming (LPB) uses electricity from a common source, such as the electrical grid or a portable generator, and converts it into light via a laser BIB002 . This laser beam is then shaped with a set of optics, and directed via a gimbaled mirror (also known as the beam director) to a remote photovoltaic (PV) receiver. The PV receiver converts the light back into electricity to be used to charge a battery, run a motor, or to do other work BIB002 . In many ways, the system can be viewed as a kind of extension cord, with electrical power going in at one end, and electrical power coming out at the other end. The best form of current laser technology is a fiber laser, which can produce peak powers in the hundreds of kilowatts BIB002 . 