It is the 200mW chargeable green ray usa green laser pointer

U.S. scientists have developed a prototype of the laser cooler, they want these coolers can put on the satellite. In recent decades, a technology called Doppler cooling has been using laser cooling material, the use of photonic atoms deceleration. The conversion of energy from atoms to photons make atomic cooling to the absolute temperature of zero to a hundred ten thousandth degrees weak. But only in very small size could be achieved. The idea of using light to make objects cooling German physicist Jin Lin Ximu first proposed in 1929. His idea is that when the emission fluorescence of the material, it will be cold. Some high power  green lase pointer    has an obvious heating effect.
When molecules absorb light, its electronic stimulated. This new state is unstable, the molecule must lose the excess energy. This can be achieved, permanent chemical changes in molecules (such as open as a key), or molecules to heat up, so that it and the surrounding environment gets hot. Excess energy in the form of light from the molecules. Fluorescence to leave all the energy and absorb more energy, cooling can be achieved. Pick their way is the energy of the photons in the laser beam, so that only those who already have some kind of energy the molecules of the material absorbed by the first of these molecules, "heating". The size of the picture of   green laser pointer     can be adjusted.
The use of statistical methods can be seen a small part of the molecule is always higher temperature than other molecular substances. When they absorb photons, they are excited to enter a higher level of state. Then fluorescence would molecules in some materials brought lower than their original energy levels, that is more "cool" vibrational. Light to leave the molecules so they contain more energy than the absorbed light, this situation is known as the anti-Stokes fluorescence. Good idea in theory, Princeton Sim, but in practice it has been difficult. The main difficulty is to find a suitable fluorescent materials and fixed it to make all the incident light is absorbed and all fluorescence was released on the "clear" solid. The shooting distance of yellow ray    green laser pointer      is much shorter.
Abstract: the use of statistical methods can be seen a small part of the molecule is always higher temperature than other molecular substances. When they absorb photons, they are excited to enter a higher level of state. Then fluorescence would molecules in some materials brought lower than their original energy levels, that is more "cool" vibrational. Light to leave the molecules so they contain more energy than the absorbed light, this situation is known as the anti-Stokes fluorescence. Alamos National Laboratory, a research team did for the first time using this method to make a solid cooling. Epstein, Gosnell and their colleagues in high-energy infrared laser to gather in one with the glass substrate and of the ytterbium (Yb3 +) ion "tainted". It is the 200mW chargeable green ray  usa green laser pointer  .
Specially chosen Yb because of high efficiency fluorescent and electronic structure is simple, so that the energy is absorbed less as an opportunity to thermal motion of the material loss. Epstein group for experiments in 1995 on a matchstick-sized glass, and would be the heat loss rate is 2% of the laser energy, it is able to achieve in the gas using the Doppler cooling efficiency 10,000 times. Gosnell say, so the success of a high degree of purity of the glass matrix, which can be done without scattering or absorption of the laser. Besides, green laser pointer  is also fit for the lecturing and teaching field.