The economical technology of green laser pointer should be enhanced more

Stimulated emission process is as follows: beginning at the atomic energy level E2, when carried by a photon energy of hυ outside just for a difference of level E2-E1, then this atom can be induced in addition to lower photon energy from level low-energy level E1 to E2 transition. This stimulated emission of photons by a significant characteristic is the atom can be induced by photons with the whole issue with the photon, not only the frequency (energy) the same, and the emission direction, polarization direction and the phase of light waves are the same. Thus, a photon incident, it will shoot out two identical photons. This means that the original optical signal is amplified by stimulated this process in the amplification of light is generated and is the laser. The quality enhancement of 50mW green laser pointer is the main topic of today’s meeting.
Not only can cause a photon induced stimulated emission, but it can also lead to stimulated absorption, so only when the number of atoms in a high energy level than in the low-level but also for a long time, stimulated emission can exceed stimulated absorption transition, which account for advantage. Thus, in order to launch the laser light source, not the key issue of ordinary light-emitting atoms in a high energy level is the number of low level of more than, this is called population inversion. However, in thermal equilibrium conditions, almost all atoms in the lowest energy level (ground state). Therefore, how to technically achieve population inversion is a necessary condition for producing laser. The agreement should be formed and signed at the end of pre-acceptance of 100mW green laser pointer .  The prices for green ray green laser pointer  is higher
Seen at 20 ℃, almost all hydrogen atoms are in the ground state, to make the light atoms, the atoms must reach the outside world to provide energy excited state, it is ordinary light contains a broad absorption and spontaneous emission by stimulated two processes. In general, this source of light radiated energy is not strong, with firing in all directions, but the energy dispersed. Know from the quantum theory of knowledge, a level corresponding to an electron energy state. Electron energy by the principal quantum number n (n = 1,2, …) decision. But the actual description of the state of motion of electrons in atoms. The package of 200mW green Laser Pointer should be firm enough.
In addition to energy, there are orbital angular momentum L and spin angular momentum s, they are quantized, the corresponding quantum numbers to describe. Of the orbital angular momentum, Bohr had given quantization formula Ln = nh, but this is not strict, because the formula is as in the electronic movement on the basis of the orbital motion. Strict quantization of energy and angular momentum quantum theory, quantum mechanics should have to derive. Quantum theory tells us that low-energy electrons from the high-energy state to state transition can only occur in l (angular momentum quantum number) quantum number ± 1 difference between the two states, which is a kind of selection rules. If the selection rules are not met, then the transition probability is very small, even close to zero. The economical technology of green laser pointer should be enhanced more.
That may exist in a number of atomic energy levels, electrons are excited to once on this level, because the choice does not meet the transition rules allow it in this level of life is very long and difficult transition to a low spontaneous level. This level is called the metastable level. However, in light of external stimulation can induce and allows them to quickly transition to a low energy level and emit photons. This process is “excited” out of the, so called stimulated emission. The concept of stimulated emission in 1917 in Einstein’s derivation of Planck blackbody radiation formula, first put forward. He atoms from the theoretically predicted the possibility of stimulated emission, which is the basis of the laser. The manager complains that the investment in development of green laser pointer is not enough.

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