Lasers is a brief, engaging glimpse at the microscopic and macroscopic world of the laser. More than three decades ago, lasers put the power of the photon in our grasp. But the Age of Optics has only just begun. Harbison and Nahory, who are experts in lasers and laser-related semiconductors, describe how excited electrons inside lasers release photons, which are directed by mirrors into a single, potent beam of light. These beams can repair a damaged eye, play a compact disc or carry a telephone conversation across the ocean. Using lavish illustrations and well chosen examples, the authors explain how lasers so tiny that they are invisible to the naked eye, and made of materials built atom by atom, are possible.
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It is curious that although H. G. Wells had invading Martians use destructive, focused "heat rays" in 1898, and although Einstein laid their theoretical foundation in 1917, lasers weren't invented until 1960. Perhaps in homage to Wells, our image of lasers often has more to do with weaponry than with the lasers in our printers, compact disc players, grocery stores, and telephone systems. Bell Labs physicists James Harbison and Robert Nahory illuminate (ahem) the quantum principles behind modern semiconductor lasers in far greater and clearer detail than is usual in popular accounts. The result is a first-class introduction to optics, quantum chemistry, and electronics, as well as a guide to the "Age of Optoelectronics" that is just beginning.
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4.0 out of 5 stars
A Popular Science Book,
By
This review is from: Lasers: Harnessing the Atom's Light (Hardcover)
This is a fine introductory book on Lasers. It basically covers a short history of Lasers, their applications, some fundemental concepts in Quantum Theory and theory of Semiconductors. This is not a technical book but rather and informative book. If you do not know anything about Lasers than you learn something but if you know some Semiconductor and Quantum Physics, you do not learn anything. I believe it really serve the purpose as popular science book but not as a textbook on Lasers.
1 of 3 people found the following review helpful:
5.0 out of 5 stars
Intro to lasers,
By Howard Schneider (Thornhill, Ontario Canada) - See all my reviews
This review is from: Lasers: Harnessing the Atom's Light (Hardcover)
This reference provides the general reader with essentially an introduction to key ideas in quantum mechanics, and demonstrates the reality of such ideas in the existence of lasers. Although Albert Einstein published in 1917 a paper discussing stimulated and spontaneous emission of light, and although technology such as discharge tubes (eg, neon lights) were available at the time, it was not until 1960 that Theodore Maiman at Hughes Aircraft Corporation, demonstrated the first laser, albeit a ruby rod laser. If an electron in an atom is put into an excited state, then eventually that electron will drop to a more stable, lower energy state and emit a photon of light in the process. Einstein noted that a photon of the same energy as one that would be emitted could stimulate the atom to drop the electron to the lower energy state and emit the photon. If the technology is used to raise electrons into a higher state and then allow a chain reaction whereby released photons stimulate other atoms to release photons and so on, then laser light results. For example, we can pass an electric current through a neon tube to excite the electrons of the neon atoms into higher energy levels. Doing so results in a neon light-- electrons spontaneously drop to lower levels and photons are spontaneously emitted. However, if we then put mirrors at the end of the neon tube, then a photon reflecting off one of the mirrors back down the axis of the tube will stimulate another excited neon atom to emit a photon, and now there will be two photons travelling in the same direction, and will stimulate more neon atoms which will release more photons, and there will be more and more photons travelling together as the chain reaction proceeds. If one of the mirrors is partially reflecting and allows a small percent of the photons hitting it to pass out, then out of this mirror will emerge a laser beam.
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