Fundamental studies on power transmission by laser beam have been made. Computer calculations and fundamental experiments about the direct energy converter from laser beam to electricity are reported. According to the calculated results, the conversion efficiency of plasma direct converter (PDC) η
3 decreases with increasing of the kinetic energy of laser produced plasma and the total conversion efficiency η
1, takes the maximum value of about 2.2%. However the efficiency η
3 has been measured to be about 0.07% experimentally. This low value comes from the poor electrostatic separation of ions and electrons in the PDC. Some proposals for the improvement of conversion efficiency are presented here.
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