The technique involves exposing the sample to intense pulses from a high power laser pointer, but the photon energy is much lower than the energy of the electrons emitted by the material. This pulse has a very large electric field, which causes electrons to quantum tunnel from the top of the valence band to the bottom of the electron conduction band, creating holes in the electron conduction band. Electrons and holes are driven by an electric field, reaching high momentum in opposite directions. The electric field itself is oscillating, and as the electric field changes, both electrons and holes reverse and accumulate. At this point, electrons and holes recombine to emit photons that escape the material and are used for detection. The energy of a photon is equal to the energy gap between the valence and conduction bands at the recombination point.
Advantages between laser pointers and LEDs
The laser pointer light source not only has the advantages of LED, but also can provide high brightness, so the laser is used for the above-mentioned household light source. However, in order to save costs, the current ordinary laser projectors do not play with the color gamut of the laser pointer light source. This is because the blue laser mixed with fluorescent pink wheel mode is low cost, but such a scheme will result in a low color gamut value. Although the theoretical color gamut of the laser light source is very high. But that refers to the performance of the RGB laser light source. For this monochromatic laser light source, there is still a big gap between the color gamut value and the theoretical value.
Mainly because numerous low priced green laser pointer techs have no established identity so homes sold through sellers are also easy to sell a lot, it's usually a select unit and company with a good track record. Quite a lot of laser workers easily It's easy to identify that many people are promoting their products, which often makes it difficult to build something anywhere, except that these are the same everywhere, albeit in some other logos. The main world model, the spectacular laser treatment, is hard to get from the sole U. years. Laser lending institutions mainly based on laser technology.