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High-Power Laser Diodes

Time : 2015-01-30 11:23Source :analogtechnologies Author : Analog Click :
    More recently high-power laser diodes operating in the wavelength range of about 0.8–1.1 micron have been getting much attention due to their widespread applications. These lasers are used in optical pumping of solid-state lasers, such as the Nd: YAG, replacing traditional flash lamp designs. High-power laser diodes are tuned to the absorption band of the dielectric crystal resulting in much more efficient pumping of the laser rod, from which a high-power focused coherent beam of light is emitted. This beam can then be used in a variety of industrial, medical, and military applications. Laser diodes have been developed to match the absorption bands of a variety of dielectric crystals in a broad wavelength range. Figure 6 shows two common variations of high-power laser diode packages.
(a) Bar-Type
 (b) S-Type
    Figure1: two common high-power laser diode packages.
    
    In addition to applications involving the pumping of solid-state laser rods, high-power laser diodes are also very useful for fiber optic telecommunication purposes. In these applications, a high-power laser diode operating at the wavelength of 980 nm is used as a pump source for erbium doped fiber amplifiers. Such optical amplifiers are used in direct optical amplification of the 1550 nm wavelength telecommunication signals propagating along the long haul telecommunication lines. In this fashion, the need to use electrical amplifying circuits is eliminated and the optical signals are directly amplified, with greater efficiency, and without the need to convert the light signal to an electrical signal and back.
    
    By stacking several high-power laser diode bars on top of one another, it is possible to make stacked laser diode arrays (Figure 7) with output powers potentially in the range of kilowatts. Such devices open up a wide range of new possibilities in such applications as industrial welding and precision cutting of metals and various other materials.

 
    Figure 2—Schematic diagram showing a typical high-power stacked bar laser diode package.