The shell of green laser pointer is certified by the national anti-explosive center

 The shell of green laser pointer is certified by the national anti-explosive center.  Currently used lasers to high power multi-YAG laser, CO2 laser-based. Scientists at the University of Texas, the United States developed the world's most powerful operational laser power, this laser produced every trillionth of a second energy generating capacity of all U.S. power plants 2,000 times the output power exceeding 1 Piwa - the equivalent power of 10 to 15 watts. This laser was first launched in 1996. Martinez said he hoped his project to break the record in 2008, that is, the laser power of 1.3 to 1.5 Piwa Piwa between. Super Laser Project Leader McAlpine ? Martinez said: "We can make materials into an extreme state, this state on earth can not see and we intend to observe the phenomenon in Texas into space is equivalent to observing a exploding star." The customer cannot disassemble green laser pointer by himself. Excitation energy can damage the outside thermal equilibrium leaving the N2> N1, this state is called population inversion. In this case, the stimulated emission transition dominant. Light through a period of length l in the inversion state of the laser working substance (active substance), the light intensity increases eGl times. G is proportional to the (N2-N1) of the coefficient, called the gain factor, and its size is also working with the nature of the material and the laser light frequency. Period of active material is a laser amplifier. If, for some active substances on the two mirrors parallel to each other (at least one of which is part of the transmission's) constitute the optical resonator (Figure 1), at high energy particles will produce a variety of directions of the spontaneous emission. Among them, the non-axial propagation of light waves outside the cavity escapes soon: axial propagation of light waves able to spread in the cavity round-trip, when it spread in the laser material, the light intensity is growing. The school has bought more several green laser pointer since last year.Repair of green laser pointer
green laser pointeris of anti-explosive design. If the resonant cavity G0l small-signal gain is greater than one-way one-way loss δ (G0l is the small signal gain coefficient), can generate self-excited oscillation. State of motion of atoms can be divided into different levels, from high energy level when the atomic transition to the low level, it will release the corresponding photon energy (the so-called spontaneous emission). Similarly, when a photon incident on a level system, and work to absorb it, will lead from the low-level atomic transition to the high energy level (so-called stimulated absorption); then, part of the transition to high-level atomic transition to the low level will and release a photon (the so-called stimulated emission). These movements are not isolated, but often simultaneously. When we create a condition, such as the use of appropriate media, cavity, enough external electric field is amplified by stimulated emission of radiation to be more than the stimulated absorption, so overall, there will be photon emission, resulting in the laser. The effective power ofgreen laser pointeris high.