Beam Shaping for Wireless Optical Charging with Improved Efficiency

Lei Tian,Haining Yang,Jiewen Nie

doi:10.3390/cryst11080970

Abstract

Optical wireless charging is a nonradiative long-distance power transfer method. It may potentially play an important role in certain scenarios where access is challenging, and the radio frequency power transfer is less efficient. The divergence of the optical beam over distances is a key limiting factor for the efficiency of any wireless optical charging system. In this work, we propose and experimentally demonstrate a holographic optical beam shaping system that can restrict the divergence of the optical beam. Our experimental results showed up to 354.88% improvement in the charging efficiency over a 10 m distance.

Highlights

Wireless charging [1,2,3,4] has attracted considerable attention in recent years due to its operational flexibility; this is especially true for underwater environments as the design of the charging cable and sockets can be complicated and often impractical
Our results showed that this technique has great potential for the application of underwater wireless charging
We demonstrated two holographic optical beam shaping techniques

Summary

Introduction

Wireless charging [1,2,3,4] has attracted considerable attention in recent years due to its operational flexibility; this is especially true for underwater environments as the design of the charging cable and sockets can be complicated and often impractical. Magnetic coupling charging [5,6] can transmit energy at the kilowatt level with high efficiency It only supports wireless charging within 1 m as the power declines rapidly with the increasing charging distance [7,8]. The propagation loss of microwaves is extremely high in the water It is not suitable for underwater applications [3,10]. Wireless optical charging has gained considerable interest in recent years due to its flexibility, strong directivity, and support for long transmission ranges [11]. Our results showed that this technique has great potential for2the of 8 application of underwater wireless charging

System Setup

Results

Figurewas

The of focusing and intensity with b value

Conclusions