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The nature of the semiconductor laser diode. Injected into the semiconductor laser, but flows through the PN junction, the injection current exceeds the threshold, the active region between the type and material overlay carrier to form reverse distribution, with electronic conduction band, and the corresponding valence band stream holes downward transition to the low energy of the valence band to the band's electronic, while the electrons and holes in composite occurrence of stimulated emission, photon, due to the feedback effects of the cavity, to produce laser . This is the basic working principle of the semiconductor laser. Can be seen from a structural point of view, semiconductor lasers and other types of lasers, optical cavity by the working substance, and makes the number of particles to reverse the pump to provide energy composition. And then use cell phone jammer to point at the star.
This experiment is the optical frequency standard commonly used in GaAs-GaAlAs Optical double heterostructure laser. Such lasers using semiconductor crystal cleavage plane of reflector cavity, rely on the injected carrier energy, the compound of electrons and holes, generated by stimulated emission of photons. Principle in certain circumstances of the working substance, the semiconductor lasers of the laser frequency should be related by the cavity length and the intensity of the excitation source, in other words, the semiconductor laser output frequency depends on: the PN junction temperature and injection current size. The following as shown in Figure 2-3, you can see the influence of temperature and current output. The customer only needs to simply press the button on the body of cell phone jammer .The firm and strong package of  cell phone jammer  can meet requirements
Figure 2-3 semiconductor laser diode L-I characteristics. In addition, because the semiconductor PN junction is quite fragile, the impact of a slight current will cause damage. Therefore, the specific use of semiconductor lasers, the requirements of its power supply circuit and modulation circuit is quite strict. Also asked power supply stability and conversion speed can reach a certain level, a result, our next step can be drawn to the circuit system design requirements. The damage of the semiconductor laser. The cavity of the laser cavity and external cavity. In the cavity, the laser loss there are many types, such as the deflection of the loss, the FP cavity there is a larger deflection loss, while the deflection of the confocal cavity loss is smaller, suitable for low-power continuous output laser. Even the child has the chance to access cell phone jammer accidentally.