The performance of green laser pointer should be perfected further

The performance of  green laser pointer  should be perfected further.
Therefore, it is in the industrial, defense, medical, scientific research has been widely used, such as drilling, welding, scribing, trimming, laser ranging, radar, guidance, laser retinal coagulation, holography, laser storage, large-capacity communication and so on. With the continuous improvement of laser performance, solid-state laser applications continues to expand. The basic structure of solid-state laser materials and work. Solid-state lasers are basically the work material, pump systems, and cooling cavity, consisting of filter systems. Figure (5-1) is a long-pulse diagram of the basic structure of solid-state laser (cooling, filter system not shown). Solid-state laser material is the work of the core of solid-state lasers. Affect the operating characteristics of solid-state laser solid-state laser is the key to the physical work and spectroscopic properties of the material, which mainly refers to the absorption band, fluorescence spectra, thermal conductivity and so on. The parameter of  green laser pointer  is perfect.
The current study had a lot of solid work material, they produced with a variety of solid-state lasers, but the most widely used is the ruby laser, neodymium-doped yttrium aluminum garnet (YAG) laser and the neodymium glass laser three. Mechanism of laser-generated latter two are similar, and ruby and YAG laser from laser-generated mechanism is concerned, belong to three-level and four-level system, there is a certain representation, so the following only describes the work of ruby and YAG laser substances. Ruby is aluminum oxide (A12O3) mixed with small amounts of chromium oxide (Cr2O3) grow into crystals. It depends on the absorption spectral properties of chromium ions (Cr3 +), as shown in Figure (5-2) below. The figure shows, the chromium ions in ruby has two strong absorption bands: a peak at 0.4l ? m at the UV band (U band) and the peak at 0.55 ? m at the yellow band (Y band). Some working conditions of green laser pointer  have given in the table.
As the ruby crystal anisotropy, and its absorption characteristics and the polarization state of light, so the vibration direction for the light field and crystal c axis perpendicular and parallel to the two components, the absorption curve is slightly different. Chromium ions in ruby laser-produced with the level structure shown in Figure (5-3) below. It belongs to three-level system, corresponding to Figure (5-3) a simplified level model, the excited state for the 4F1 and 4F2 levels E3, laser upper and lower levels of E2 and E1, respectively 2E and 4A2. Its fluorescence spectrum there are two: R1 and R2 lines lines at room temperature corresponding to the central wavelength of 0.6943 ? m, respectively, and 0.6929 ? m. Since the radiation intensity ratio R1 R2 line big total in the course of the dominant oscillation, it is usually ruby laser generated laser lines are R1 line (0.6943 m).  green laser pointer  has the outstanding feature.