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Excitation Mechanism
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The excitation mechanism is the device used to put energy into the active medium. Three primary types of excitation mechanisms exist optical, electrical, and chemical. All three provide the energy necessary to raise the energy state of the atom, ion, or molecule of the active
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Common Material Ruby Nd:YAG Nd:glass Erbium Wavelength Produced, nm 694 1,060 1,060 1,612 360 650 488 632.8 647 10,600 850 1,600 3,200
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Type of Active Medium Solid
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Organic dyes Argon (ionized) Helium-neon Krypton (ionized) CO2
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TABLE 2.10 Wavelengths of Laser Materials
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medium to an excited state. The process of imparting energy to the active medium is called pumping the laser.
2.12.2.2.1 Optical Excitation An optical excitation mechanism uses light energy of the proper wavelength to excite the active medium. The light may come from any of several sources, including a flash lamp, a continuous arc lamp, another laser, or even the sun. Although most of these use an electric power supply to produce the light, it is not the electrical energy that is used directly to excite the atoms of the active medium, but rather the light energy produced by the excitation mechanism. Optical excitation is generally used with active media that do not conduct electricity (e.g., solid lasers like the ruby). Figure 2.109 is a schematic drawing of a solid laser with an optical pumping source. The sun is considered a possible optical pumping source for lasers in space. The optical energy from the sun could be focused by curved mirrors onto the laser s active medium. Since the size and weight of an electric power supply is of concern in space travel, solar pumping of lasers is an interesting alternative. 2.12.2.2.2 Electrical Excitation Electrical excitation is most commonly used when the active medium will support an electric current. This is usually the case with gases and semiconductor materials. When a high voltage is applied to a gas, current-carrying electrons or ions move through the active medium. As they collide with
C l a s s i f i c a t i o n a n d Ty p e s o f S e n s o r s
FIGURE 2.109
Solid laser with optical pumping source.
the atoms, ions, or molecules of the active medium, their energy is transferred and excitation occurs. The atoms, ions, and electrons within the active medium are called plasma. Figure 2.110 is a schematic drawing of a gas laser system with electrical excitation. The gas mixture is held in a gas plasma tube and the power supply is connected to the ends of the plasma tube. When the power supply is turned on, electron movement within the tube is from the negative to the positive terminal.
2.12.2.2.3 Chemical Excitation Chemical excitation is used in a number of lasers. When certain chemicals are mixed, energy is released as chemical bonds are made or broken. This energy can be used as a pumping source. It is most commonly used in hydrogen-fluoride lasers, which are extremely high-powered devices used primarily in
FIGURE 2.110
Gas laser with electrical excitation.
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military weapons and research. These lasers are attractive for military applications because of the large power-to-weight ratio.
Feedback Mechanism
Mirrors at each end of the active medium are used as a feedback mechanism. The mirrors reflect the light produced in the active medium back into the medium along its longitudinal axis. When the mirrors are aligned parallel to each other, they form a resonant cavity for the light waves produced within the laser. They reflect the light waves back and forth through the active medium. In order to keep stimulated emission at a maximum, light must be kept within the amplifying medium for the greatest possible distance. In effect, mirrors increase the distance traveled by the light through the active medium. The path that the light takes through the active medium is determined by the shape of the mirrors. Figure 2.111 shows some of the possible mirror combinations. Curved mirrors are often used to alter the direction in which the reflected light moves.
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