Optical frequency optimization of a high intensity laser power beaming system utilizing VMJ photovoltaic cells
Optical frequency optimization of a high intensity laser power beaming system utilizing VMJ photovoltaic cells
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利用 VMJ 光伏电池的高强度激光功率束系统的光频率优化
DOI：
10.1109/icsos.2011.5783675
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T. Nayfeh
中科院分区：
文献类型：
--
作者：
D. Raible;D. Dincă;T. Nayfeh
一种有效的无线电力传输（WPT）形式已经被开发出来，可以延长任务持续时间，增加覆盖范围，并为太空和地面应用增加功能，这些应用可能受益于光学传输的电能。高强度激光功率束 (HILPB) 系统可实现微型无人机 (MUAV)、飞艇、机器人探索任务和航天器平台等电动平台的远程光学“加油”。为了进一步推进 HILPB 技术，本次研究的重点是确定 HILPB 接收器使用的最佳激光波长，该接收器利用垂直多结 (VMJ) 光伏电池。为了最大限度地提高连续高强度下的转换效率，从而提高 HLPB 系统的输出功率密度，必须对激光系统进行频率优化。在 NASA 格伦研究中心 (GRC) 进行的设备初始光谱表征表明了峰值光电转换效率的大致范围，但这些数据集代表了较低照明水平下的瞬态条件。本文的主要重点是将这些结果扩展到高水平的稳态照明，同时关注可用的商用现成半导体激光源和大气传输约束的兼容性。介绍并讨论了在光伏 VMJ 电池指定带隙附近的四种不同工作频率下利用高功率连续波 (CW) 半导体激光器的实验硬件结果。此外，使用单个光伏 VMJ 电池实现了迄今为止最高的接收器功率密度，该电池提供了 13.6 W/cm2 的极高电输出，光电转换效率为 24%。这些结果非常有前景且可扩展，因为类似结构的潜在 1.0 m2 HLPB 接收器将能够在类似条件下产生 136 kW 的电力。
An effective form of wireless power transmission (WPT) has been developed to enable extended mission durations, increased coverage and added capabilities for both space and terrestrial applications that may benefit from optically delivered electrical energy. The high intensity laser power beaming (HILPB) system enables long range optical ‘refueling’ of electric platforms such as micro unmanned aerial vehicles (MUAV), airships, robotic exploration missions and spacecraft platforms. To further advance the HILPB technology, the focus of this investigation is to determine the optimal laser wavelength to be used with the HILPB receiver, which utilizes vertical multi-junction (VMJ) photovoltaic cells. Frequency optimization of the laser system is necessary in order to maximize the conversion efficiency at continuous high intensities, and thus increase the delivered power density of the HILPB system. Initial spectral characterizations of the device performed at the NASA Glenn Research Center (GRC) indicate the approximate range of peak optical-to-electrical conversion efficiencies, but these data sets represent transient conditions under lower levels of illumination. Extending these results to high levels of steady state illumination, with attention given to the compatibility of available commercial off-the-shelf semiconductor laser sources and atmospheric transmission constraints is the primary focus of this paper. Experimental hardware results utilizing high power continuous wave (CW) semiconductor lasers at four different operational frequencies near the indicated band gap of the photovoltaic VMJ cells are presented and discussed. In addition, the highest receiver power density achieved to date is demonstrated using a single photovoltaic VMJ cell, which provided an exceptionally high electrical output of 13.6 W/cm2 at an optical-to-electrical conversion efficiency of 24 %. These results are very promising and scalable, as a potential 1.0 m2 HILPB receiver of similar construction would be able to generate 136 kW of electrical power under similar conditions.