Final answer:
The efficiency of wireless power transmission using lasers varies, but improvements can be made through better conversion efficiency, beam collimation, and optimized receivers. Higher frequency electromagnetic waves carry more data, important for laser communication, while ELF with lower frequencies is used for submarine communication due to penetration capabilities.
Step-by-step explanation:
The efficiency of wireless power transmission using lasers is not trivial to pinpoint as it can vary widely based on technology and setup. However, enhancing transmission efficiency might include improving the conversion efficiency of electrical energy to laser light, refining the collimation of the laser beam to reduce divergence, and developing better photovoltaic receivers optimized for the wavelength of the laser. The importance of frequency in data transmission is apparent when considering that higher frequency electromagnetic waves, such as those used in optical fibers for laser telephone transmission, can carry more information than lower frequency waves, which is essential for applications like laser communication. For ELF radio communication with submarines, the implication is that lower frequencies penetrate water better but carry less data.