This paragraph can be skipped by a hurried reader, while it is explaining only some parts of my background, along time, which made possible such a simple but very important discovery.
Since I was a child I became interested about gravity, first time, when my father told me about Space, Stars and Black Holes.
I was fascinated how light is captured by the huge gravitational field of the black hole, and cannot escape from it. I have been always interested also about flying and how to improve it to be closer to the way Superman flies into the movie. I remember once, being in high school, when I promised to a close friend of mine that I will discover something, which will revolutionize the way people fly (also the transportation in general).
Later, like most of us, I found out about Einstein and his proven theories, so that my idea came from the fact that according to the general theory of relativity, a ray of light will experience a curvature of its path when it will pass through a gravitational field. Based on this proven interaction between light and gravity I have made my discovery, presented below.

First, let us remember here, through a simple image, the deflection of light by a gravitational field, fact resulted from the general theory of relativity, also proven experimentally:

The light from the star is deflected by the gravitational field of the Sun, so that from the observer from Earth the position of the star appears at a different location than its true position.

Therefore, having the proven interaction between light and gravitation, here comes my idea, by thinking to invert the values of this process, so that a high enough density light field "will create some troubles" to a weak enough gravity field.
It is like the inverse phenomenon from a Black Hole, regarding light and gravitation, but at a much smaller level.
This inverted phenomenon is valid/functional, being a consequence of the Action-Reaction principle, in other words to the light bending gravity action it is opposed a corresponding action from light to the gravitational field.

Other explanation, more intuitive, is that the very high density of photons, at their high speed, will make the distances between them so small that most of the gravitons from the gravitational field, which can be imagined, for the elementary particles, like what the air/wind is for the objects into our atmosphere, will be stopped/deviated by this barrier of photons, as the sail is a barrier for the wind.

Next step, I have created my Gravitational Isolator, which is using a laser for the "high enough density light field" mentioned above, captive inside of a disc, with total reflection surfaces on its interior, to counteract (isolate) the Earth’s gravity, like in the image below:

The Gravitational Isolator is efficient because the strong laser, captive inside it, can resist many years function of how correctly the interior surface is made as close as possible to the total reflection (to have only very small energy/laser waste over time).

Therefore the energy consumption (required for building/using such devices) is small, the laser being used very efficiently, because as soon as the "enough laser density" is accomplished inside the total reflection interior, the isolator’s surface will be entirely closed, and then stopped of course the laser radiation, used to fill it, so that there will be no more energy consumption, but a wise using of it by keeping for a long time (many years) the desired value of the laser inside the Gravitational Isolator (for the cases when the surface inside the gravitational isolator is NOT close enough to total reflection, the laser can be used continuously, powered by part of the energy generated by the gravitationally rotating wheel (of the "free energy generator" mentioned above), but this is not recommended for a long run (to work on big periods of time), because of the laser waste/escape/absorption troubles).