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The experimental setup is shown below. Pumping light converged after collimation focusing system into a diameter of 400um focused spot is injected into the work material internal radius of curvature of the output mirror M1 is 50 mm, concave-plated 946 nm high reflector (HR) film, 473 nm (AR anti- ) color film, the first two sub-arm all-trans mirror M2 radius of curvature of 200 mm, concave-plated 946 / 473nm the HR membrane. 1, arm length of 72 mm 2, arm length is 29 mm. Experiments in the gain medium Nd: YAG crystal (Φ4mm x 3mm) the left plated the 808 nmAR/946 nm, the HR membrane as an end mirror, plated 946 nm, the other end of the AR film. Multiplier device is Class I critical phase-matched LBO crystal (3 mm x 3 mm x 9 mm). And then the laser technology of cheap Laser Pointers becomes the key point.
Both ends of the surface are coated AR-color film, placed in the first two sub-arm beam waist at 946 nm / 473 nm. Further increase the cooling, the system may have a greater power output. The laser classification, there are two ways to classify the laser. A state of matter, surface active medium. This can be divided into a gas, liquid, solid, and semiconductor lasers. Various types of lasers have their own characteristics. Gas laser monochrome, such as helium - neon laser monochrome than ordinary light, 100 million times high, and gas lasers, a wide variety of work material, and therefore can produce many different frequency laser. However, due to low gas density, the laser output power corresponding smaller. The financing plan preparation of laser light show equipment needs to be finished timely.
Solid-state lasers is the opposite, high energy, high output power, but work fewer material types, and the monochrome poor; the biggest characteristic of the liquid laser is the laser wavelength can be within a certain range of continuous transformation. Of this laser is particularly suitable for the laser wavelength with the stringent requirements of occasions; semiconductor laser is characterized by small size, light weight, simple structure, but the output power is small, poor monochromaticity. Another classification is the classification of the particle structure of the active medium can be divided into atoms, ions, molecules and free electron laser. Helium - neon laser to produce laser emission by neon atoms, the ruby laser to produce the laser is fired by the chromium ions.  laser light show equipment can emit the very special red laser beam.
In addition to carbon dioxide molecular laser, its frequency can be continuously changed. And can cover a very wide frequency range. A variety of laser active medium, a different approach. In general can be divided into three methods: the use of high-intensity light, with power to the electronic and less with the third method - nuclear radiation. Lasers used in optical fiber communication optical fiber communication, the light source used in three types: semiconductor lasers, semiconductor light-emitting diodes and semiconductor lasers. In the actual optical fiber communication systems, usually use the first two. Instead of semiconductor lasers, gas lasers, solid-state lasers, although they are first made coherent light source. This kind of laser light show equipment can emit the red laser beam light.
However, due to its size is too big, not suitable for small size fiber used in conjunction with, only for some special places. The semiconductor laser semiconductor laser is a laser diode, denoted by the LD. It was invented in 1960 by the former Soviet Union scientists H.Γ. Basov. The structure of the semiconductor laser is usually from the P layer, N and the formation of double-heterostructure active layers. The light-emitting semiconductor laser is the principle of the use of light by stimulated emission of radiation. In the distribution of inversion electrons in the external incident photon excitation, synchronized emission of photons by stimulated emission of photons and the incident photon is not only the wavelength and phase, the same direction. Strong emission, so that by the weak incident incentive to play the role of optical amplification. So that the customer or others can see the red laser beam light of laser light show equipment very clearly.