Laser crystal is the crystal which can radiate laser. Laser refers
to a bouquet of powerful beam that are made use of material in the
majority of particles at the excited state, with the outside world
light sensors, so that all particles in the excited state by
stimulated emission at the same time. Laser has a good direction, monochrome and coherence, and
these characteristics make it have been widely applied in all aspects
of society. Laser crystal was composed of two parts, one part is the
"luminous center" activation ions, the other part is activated ion
as a "vector" of the crystal matrix. oxide crystals is the most
important in Crystal matrix, these crystals have the unique advantages
of high melting point, hardness, and good thermal conductivity, etc.
Among them, ruby and yttrium aluminum garnet (YAG) are used most
widely , there is also another one called "color center" matrix
crystals, because their lattice defects can absorb a spectral range
of visible light and show some color, they can achieve tunable
laser oscillation.
In addition to the traditional crystal lasers, laser crystals
are developed to the two extremist direction: super-large and
ultra-small. super-large laser is Mainly used crystal laser fusion,
laser isotope separation, laser processing and other fields, and the
ultra-small crystal laser mainly refers to the semiconductor laser,
because of the advantages of its high efficiency pump, the low heat
load on the crystal, good stability of laser output, long life,
small size and so on, it will have a huge development in practical application
in the future. |