The power of green laser pointer is 5mw-10mw

Semiconductor lasers with semiconductor material as the working substance of a class of lasers, due to differences in physical structure, the specific process of laser-generated rather special. Commonly used material gallium arsenide (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulfide (ZnS), etc. Incentives and electricity into the electron beam excitation and optical pumping in three forms. Semiconductor laser devices can be divided into homojunction, single heterojunction, and other types of double-heterostructure. Homojunction lasers and single-heterostructure laser pulse at room temperature and more devices, and double-heterostructure lasers can achieve continuous operation at room temperature. china laser pointer   is wrapped in the budget.
Semiconductor lasers based on semiconductor materials, do some physical work generated by the stimulated emission devices for the working principle is, by some incentives, in the semiconductor material of the band (the conduction band and valence band), or between the semiconductor material The band and impurity (acceptor or donor) level between the non-equilibrium carriers to achieve the population inversion, when inversion state in a large number of electron and hole recombination, the role of stimulated emission arises Semiconductor lasers, there are three main incentives that power injection, optical pump-and high-energy electron beam excitation type. power semiconductor laser injection, usually by GaAS (gallium arsenide), InAS (InAs), Insb ( InSb) semiconductor materials such as junction diodes along the forward bias injection current for incentives, in the end surface area produced by stimulated emission. The package of     green laser     is very special.
Optically pumped semiconductor lasers, generally with N-or P-type semiconductor crystals (such as GaAS, InAs, InSb, etc.) to do the work material, issued by other lasers for optical pumping of laser excitation. High-energy electron beam excitation semiconductor laser, is generally with N-type or P-type semiconductor crystals (such as PbS, CdS, ZhO, etc.) to do the work material, through high-energy electron beam injected from the outside to inspire in the semiconductor laser device, the current performance is better, broader application is a two- heterostructure GaAs diode laser power injection. semiconductor laser works by incentives, the use of semiconductor materials (both electronic) transitions in the band between the light-emitting, semiconductor crystal cleavage plane to form two parallel mirrors as reflectors to form the cavity so that the light oscillation, feedback, resulting in amplification of light radiation, the output laser. The power of     green laser pointer     is 5mw-10mw.
Semiconductor lasers lasers advantage of small size, light weight, reliable operation, low power consumption and high efficiency. Semiconductor laser packaging technology, mostly in discrete packaging technology based on the development and evolved, but have great specificity. In general, discrete devices die is sealed in the package body, the main role of packaging is to protect the die and complete the electrical interconnection. The semiconductor laser package is the complete output signal, to protect the die work, output: visible features, both electrical parameters, there are optical parameters of design and technical requirements, not simply discrete package for semiconductor lasers . Effective range of    laser pointer   is more than 1000m.
Part of the core light-emitting semiconductor laser is p-type and n-type semiconductor pn junction consisting of the die, when injected into the pn junction of the minority carrier and majority carrier recombination time, we will send visible light, ultraviolet light or near infrared light. But pn junction emit photons non-directional, ie fired in all directions have the same probability, therefore, not all the light generated by the die can be released, depending on the quality of semiconductor materials, structure and geometry of the die , the internal structure and encapsulation materials, packaging, semiconductor lasers application requirements to improve internal and external quantum efficiency. Distance of remote control of    laser pointer pen     is about 15m.