green laser pointer for Projector

Compression ignited kinetic energy converted to heat the plasma, results in the central area of 10keV (about 100 million degrees) above the high-temperature plasma (thermal ionization sparks) (Figure 10-2 (c)). Thermal ionization spark the ambient temperature is relatively low, in a compressed state, namely, the formation of more than 1000 times the solid density of ultra-high density plasma. Thermal ionization in the spark, the nuclear fusion burning the beginning of the following reactions: the release of alpha particles, caused by plasma heating. Lead to the formation of fusion around the combustion and expansion (as shown in Figure 10-2 (d)). The manager says that the 2.4G technology of   green laser pointer     is more practical in use.
Inertial confinement fusion research into the research phase of the so-called fast ignition mechanism. The picosecond ultrashort pulse laser to the implementation of laser compressed fast ignition of the pellet area has become a controlled nuclear fusion research focus. The United States has achieved a petawatt-class power, subpicosecond ultrashort pulse laser output kilojoules of energy, Japan and the United Kingdom has also been close to the magnitude of the laser pulse. Human beings have in the control fusion threshold, the dawn is about to achieve controlled nuclear fusion using a laser show. Access to low temperature is a long time scientists deliberately pursue a technology. Study the structure of matter and nature, reveal the secrets of nature to create a unique condition. For example, at low temperatures, molecules, atomic thermal motion can be greatly reduced, atomic easier to expose their "nature". Many products of   100mW green laser pointer   adopt the 2.4G technology of    green laser pointer    .
The past, low-temperature solid or liquid system, these systems contain a large number of particles with strong interaction. In the 1980s, by means of laser technology for extremely low temperature of the neutral gas molecules (such as 10-10K) status, the manipulation of single atoms. Access to low-temperature method called laser cooling [32,102]. The method of laser cooling of neutral atoms the Hans (TWH?nsch) and Xiao Luo (ALSchawlow) in 1975, in the early 1980s to achieve effectively slow down the cooling of neutral atoms. The basic idea of this laser cooling head shot to the photon (Figure 10-3): the moving atom in the resonance absorption from the ground state transition to the excited state, its momentum is reduced, the speed reduces. The 2.4G technology of   50mW blue violet laser pointer    is advanced enough.
Atoms in the excited state spontaneous emission of photons and return to the initial state, due to the recoil will get the momentum. Since then, it will absorb photons and spontaneous emission of photons, but it should be noted that it absorbs photons from the same laser beam, in the same direction, will make the atomic momentum decreases. However, the direction of the spontaneous emission of photons is random, multiple spontaneous emission on average does not increase the atomic momentum. After a number of absorption and spontaneous emission, the speed of the atom will significantly reduce the temperature will reduce. General atoms actually a second absorption and emission of tens of millions of photons, and thus can effectively slow down. Cooling sodium atoms, the wavelength of 589nm the resonance light, this slowing effect is equivalent to 10 times the acceleration due to gravity. The 2.4G technology of    200mW green Laser Pointer    is at the world’s level.
Must be considered due to this slowdown to achieve the incident photon Doppler effect of a moving atom, so this reduction is called Doppler cooling. Because of the velocity can be positive or negative, on the opposite two-beam direction resonant laser beam atoms (Figure 10-4). At this atom will preferentially absorb the photon head-shot to achieve the results of the Doppler cooling. In fact, the atomic motion is three dimensional. Steven Chu group of Bell Labs in 1985 with 3 in the opposite direction of the laser beam along the x, y, and z three directions irradiated sodium atoms (Figure 10-5) in the six-beam laser junction of sodium atoms is cooled down, the temperature reaches 240 o K. The directivity of    green laser pointer     is not convenient for using.
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