This means that the end of the junction area the conduction

 This means that the end of the junction area the conduction band on the energy levels of electrons occupying the chance is greater than the valence band to the next level of the electrons occupy chance (5-5) and (5-6) into the condition and simplifying to get.
Longer .6328 ? m He-Ne laser, although the dielectric film mirror with high reflectivity .6328 ? m wavelength of light, it will still produce a strong 3.39 ? m wavelength amplified spontaneous radiation or laser, the upper level which will allow the number of particles decreased, resulting in lower laser power of 0.6328 ? m. Strong .6328 ? m laser output requires the use of the dispersion method, inhibition of 3.39 ? m radiation absorption method or an external magnetic field method. Output power characteristics. He-Ne laser discharge current on the output power has a great influence. Figure (5-11) is the experimentally measured output power and discharge current curve. This Laser Pointer is the good tool and assistant for the customer.
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 Pointer .
He's lower ionization potential, the ratio is too large will increase the ionization of too much leaving the number of electron ion, the lower the electric field will be able to maintain a certain discharge current, low electric field causes the electron temperature decreased to reduce the excitation rate, output power decreases. The experiment proved that the He-Ne laser with the best mixing ratio and the best inflatable pressure, that is, there is the best inflatable conditions. The optimal conditions must be considered in the manufacture of a He-Ne laser. If the discharge capillary diameter d, gas pressure is p, then there exists a maximum power output of the best pd value. He-Ne laser pd value of about (4.8 ? 5.3) × 102 Pa ? mm. The reason for this phenomenon is: on the one hand the pressure decline in the electronic and atomic collisions reduce. It is the brilliant technology of Laser Pointer . 
The same time, these features so that it can under certain special conditions of measurement has many advantages compared to conventional detection techniques, is a leading direction of the development of sensor technology. As a light source of one of the key optical components in fiber optic sensor, its stability has a direct impact on the accuracy of the optical fiber sensor.