It is the multiple function Laser Pointer

 It is the multiple function Laser Pointer .
The laser-produced must be able to provide the optical positive feedback cavity. In the excited state of particles due to the instability of spontaneous emission to the ground state, spontaneous emission of photons in all directions, off axis photons will soon escape the cavity, only photons along the axial part of the output through the output mirror, some is reflected back to the work material is magnified multiple times in the back and forth between two mirrors, the formation of stimulated emission, optical amplification, laser-generated. Optical frequency multiplication principle. Light of the multiplier is one of the most commonly used nonlinear optical expansion band. Frequency doubling of laser light of frequency ω, the nonlinear interaction in the crystal, resulting in the light of frequency 2ω. Actually, this kind of 3 in 1 Laser Pointer  is really practical and popular in both the domestic market and oversea market.
When the interaction between light and matter, the atoms in the material arising from the dipole moment due to induction. Induction electric dipole moment per unit volume of stack up to form the vector of electric polarization intensity. The polarization field generated by the electric polarization intensity emitted secondary electromagnetic radiation. When the electric field strength of the external light field is much smaller than the electric field strength in the material atoms, substance induced polarization intensity is proportional to the external electric field strength. Before the laser does not appear, when there are several different frequencies of light waves with the substance, the various frequencies of light are linearly independent reflection, refraction and scattering, to meet the wave superposition principle does not produce a new frequency. When the electric field strength of the outside light field is large enough (eg, laser), the response of the material and light field and the external electric field strength with non-linear relationship.  Laser Pointer  will make it more convenient for the customer to use the laser pointer in the practical use. No matter whether the customer in the corner of the classroom or lecture hall or the user is at the back of the meeting room to interact with the audience at site, the user or customer just needs to press the button on the wireless presenter  Laser Pointer .