The chief kinds of lasers are solid state lasers, gas lasers and liquid lasers. A good, liquid, gas or semiconductor can act since the laser medium.

Solid state lasers are produced with hard materials like garnet or ruby. Solid state lasers are useful for detecting ecological pollution, in scientific researches and a number of other applications. Solid state lasers have laser emitting materials arranged in solid matrix. Examples for solid state lasers will be the ruby or neodymium-Yttrium Aluminum Garnet (YAG) lasers. The lasing materials are pumped with flashlights, making the laser give either pulsed or continuous beam of light.

Gas lasers are lasers in which an electric current is passed via a gas to make light. In early days gas lasers used a combination of helium and neon with carbon dioxide. At present gas lasers may use more strong and volatile mediums like hydrogen and fluorine. Gas lasers have great military applications. The cutting of hard materials becomes easy through gas lasers.

Liquid lasers or dye lasers take advantage of liquid organic dyes. These emit a wide, continuous range of colors, mainly in the visible the main spectrum. Dye lasers are excellent for applications in which a certain color is required Certified Lasers. Another laser source such as copper vapor laser can be used to excite the dye. Liquid lasers can be tuned over a wide range of wavelengths.

Excimer lasers are generated by utilizing gases like fluorine and chlorine in conjunction with other gases such as krypton, argon or xenon. Excimer lasers are very helpful for the medical profession. To regulate the wavelength of the lasers compound natural dyes are employed extensively.

Semiconductor lasers are generally tiny devices and use only low power. Semiconductor lasers are also called diode lasers. The writing sources in a few CD players and in a few laser printers are examples for this. Semiconductor lasers are very helpful for gadgets like CD players, laser printers etc.