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Helium - neon (He-Ne) laser. He-Ne laser system in the late 1960s the success of the first gas lasers. Because of its simple structure, easy to use, good beam quality, reliable and easy to manufacture, etc., is still the most widely used as a gas laser. Structure and excitation mechanism of the He-Ne laser. Laser tube and the cavity reflector placed on the different ways of He-Ne laser can be divided into the intracavity and external cavity and the three semi-cavity, as shown in Figure (5-9) shown. External cavity and a half-cavity structure, one or both ends of the discharge tube through the Brewster windows vacuum sealed in order to reduce losses, and ensures that the laser output is linearly polarized light. We highly recommend this kind of Green Laser Pointer 500MW to our customers.
He-Ne laser working substance of the Ne atom, the laser radiation occurs between different energy levels of Ne atoms. He-Ne laser discharge tube, charge a certain percentage of He gas, mainly to improve the Ne atom pumping rate plays a supporting role. He-Ne laser structure. (5-10) and lasing in the Ne atom part of the energy level diagram (a better understanding can check the books), the Ne atom laser level 3S and 2S level, laser level to 3P and 2P level. The figure shows the He atom excitation level 21S0, 23S1, respectively, and Ne atoms, 3S and 2S level is very close, so when the gas discharge tube of the He-Ne, He atoms in collisions with the high-speed electronics. For this kind of laser pointers can be used in many different locations.
Excited to the 23S1 and 21S0, in turn, these stimulate the state He atoms by resonance energy transfer process in the ground state Ne atoms excited to the 2S and 3S level. When Ne atoms excited to the 3S and 2S level sufficient number for a long time, 3S, 2S level and 3P, 2P level to produce the population inversion, stimulated emission process to produce the He-Ne laser. Ne atoms by the process of transition to the 3P, 2P level very easy transition to the 1S energy level, and through the wall collision energy cross wall to the ground state by spontaneous emission. Zumba DVD The Ne atom part of the energy level diagram and laser transitions. Visible above the excitation process. And this kind of laser pointers has the good and high quality and performance.
He-Ne laser is a typical four-level system, the laser line have three, they respectively correspond to the following transition: the major lines of commercial He-Ne laser is 0.6328 ? m red, other yellow light (0.594 ? m), green (0.543 ? m) and orange (.606 ? m, 0.612 ? m) He-Ne laser with the sale of goods. He-Ne laser output characteristics. For the He-Ne laser applications, where introduction of the spectrum of competition and output power characteristics. With a laser may be a number of laser lines, some lines may correspond to a laser level, and therefore the number of particles in the total level of competition between them. At the same time this kind of laser pointers has the strict parameters and perfect design and technology.
It can be seen, each inflatable total pressure has a maximum output power of the discharge current with the gas mixture and total pressure. In the best inflatable conditions, the maximum output power of the discharge current is called the optimal discharge current. Can be seen from the diagram, near the optimum discharge current, the output power because of the discharge current changes caused little change. Therefore, when in actual use, the best discharge current is not very strict, which is very conducive to the adjustment of the working state. Curve of output power with discharge current. He-Ne laser is filled with He gas and Ne gas mixing ratio and total pressure has a great influence on the output power. Lasing in the Ne atom ratio is too small to make the output power is reduced. It is the perfect design of laser pointers.