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If you have used a CD or a DVD player, then you have used a laser These lasers, as well as the ones used in laser pointers, are made of semiconducting solids The laser in a CD player is made of layers of gallium arsenide (GaAs) and gallium aluminum and arsenide (GaAlAs) The lasing layer is only 200-nm thick, and each side of the crystal is only 1 2 mm long The atoms in the semiconducting solid are pumped by an electric current, and the resulting photons are amplified as they bounce between the polished ends of the crystal Table 28-1 shows the wavelength and type, pulsed or continuous, produced by some common lasers Most lasers are very inefficient For example, no more than 1 percent of the electrical energy delivered to a gas laser is converted to light energy Although crystal lasers have efficiencies near 20 percent, they often have much less power than gas lasers do Despite their inefficiency, the unique properties of laser light have led to many applications Laser beams are narrow and highly directional they do not spread out over long distances For this reason, surveyors use laser beams in applications such as checking the straightness of long tunnels and pipes When astronauts visited the Moon, they left behind mirrors on the Moon s surface Scientists on Earth have used the mirrors to reflect a laser beam transmitted from Earth The distance between Earth and the Moon was thus accurately determined By tracking the Moon s location from different parts of Earth, the movement of Earth s tectonic plates has been measured Laser light also is commonly used in fiber-optics communications A fiber optic cable makes use of total internal reflection to transmit light over distances of many kilometers with little loss of signal energy The laser, typically with a wavelength of 1300 1500 nm, is rapidly switched on and off, transmitting information as a series of pulses through the fiber All over the world, optical fibers have replaced copper wires for the transmission of telephone calls, computer data, and even television pictures.

Laser Eye Surgery Excimer lasers are used in laser eye surgery because the energy of the photons that they emit are able to destroy abnormal tissue without causing harm to surrounding healthy tissue Thus, a skilled surgeon can use the laser to remove extremely thin layers of tissue in order to reshape a cornea

Figure 28-19 The ultraviolet photons emitted by this laser are able to strip electrons from atoms of the targeted tissue The photons break chemical bonds and vaporize the tissue

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The single wavelength of light emitted by lasers makes them valuable in spectroscopy Laser light is used to excite other atoms The atoms then return to the ground state and emit characteristic spectra Samples with extremely small numbers of atoms can be analyzed in this way In fact, single atoms have been detected and held almost motionless by means of laser excitation The concentrated power of laser light is used in a variety of ways In medicine, for example, lasers are used to reshape the corneas of eyes Lasers also can be used in surgery, as shown in Figure 28-19, in place of a knife to cut flesh with little loss of blood In industry, lasers are used to cut materials such as steel and to weld materials together In the future, lasers may be able to produce nuclear fusion to create an almost inexhaustible energy source A hologram, shown in Figure 28-20, is a photographic recording of both the phase and the intensity of light Holograms are made possible by the coherent nature of laser light Holograms form realistic three-dimensional images and can be used, among other applications, in industry to study the vibrations of sensitive equipment and their components

Figure 28-20 A hologram is formed when interference of two laser beams records both the intensity and phase of light from the object on film

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