The laser glass consists of two parts, a matrix glass and an activated ion. The various physicochemical properties of VUV grade LiF optics are mainly determined by the matrix glass, and its spectral properties are mainly determined by the activated ions. However, the matrix glass and the activating ions interact with each other, so the activation ions have a certain influence on the physicochemical properties of the laser glass, and the influence of the matrix glass on its spectral properties is sometimes quite important. As the matrix glass of wholesale LiF optics, optical glass is mostly used at present. However, it is not suitable for any kind of optical glass to be used as laser glass. Any laser beam must meet the basic requirements. The following are summarized:
(1) The illuminating mechanism that activates ions must have metastable state to form a three-level or four-energy vertical mechanism; and it is required that the metastable state has a long life, so that the number of particles is easy to accumulate and reverse. In order to make the laser glass have higher efficiency and low oscillation value, the four-level is superior to the three-level in terms of the energy level mechanism. When the energy interval between the final state and the ground state is greater than 1000 cm-1, the final energy level is almost empty at room temperature. Therefore, pumping at room temperature is also prone to particle number inversion. At present, various activated ions of laser light have been generated in the glass, and Nd3+ ion ****, which is a four-level mechanism, the distance between the final state of the procurement customizable large size optical Window and the ground state energy level is about 1950 cm.
(2) Laser glass must have a variety of spectral properties. Including absorption spectroscopy properties, it is required to have a wide and many absorption bands in the radiant light of the excitation source, a high absorption coefficient, and the absorption band and the peak of the radiation band of the light source overlap as much as possible, which is beneficial to make full use of the excitation light source. Energy; fluorescence spectral properties, generally require that its fluorescence band is small and narrow, so that the output energy is not dispersed; at the same time, in order to convert the absorbed excitation light energy into laser energy as much as possible, the quantum efficiency of fluorescence is required to be as high as possible. The internal energy loss is as small as possible.