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When this publisher offered me the opportunity to \\Tite a book,
some six years ago, I did not hesitate to say yes. I had just spent
the last four years of graduate school struggling to understand the
physics of strained quantum well lasers, and it seemed to me the
whole experience was much more difficult that it should have been.
For although many of the results I needed were easy to locate, the
underlying physical premises and intervening steps were not. If
only I had a book providing the derivations, I could have absorbed
them and gone on my way. Such a book lies before you. It provides a
unified and self-contained descrip tion of the essential physics of
strained quantum well lasers, starting from first principles
whenever feasible. The presentation I have chosen requires only the
standard introductory background in quantum mechanics, solid state
physics, and electromagnetics expected of entering graduate
students in physics or elec trical engineering. A single
undergraduate course in each of these subjects should be more than
sufficient to follow the text. :'Iore advanced material on quantum
mechanics is developed and collected in the first chapter. \Vhen
pos sible, I have presented the results in a general setting and
have later applied them to specific cases of interest. I find this
the most satisfying way to ap proach the subject, and it has the
additional benefit of solving many problems once and for all.
Physics of Strained Quantum Well Lasers provides an extremely
detailed, accessible, and clear account of the fundamentals of the
subject. This self-contained presentation progresses from strained
quantum well bandstructure to device physics. It is specifically
tailored to the background and needs of incoming graduate students
in electrical engineering and physics, as well as industrial
research and development engineers. Only a standard undergraduate
knowledge of quantum mechanics, solid state physics, and
electromagnetism is required. No prior familiarity with lasers is
needed. The first chapter of Physics of Strained Quantum Well
Lasers is a mini-course on advanced quantum mechanics, and explains
the most important techniques. Perturbation methods, both
time-independent and time-dependent, are developed in detail,
making the rest of the material much easier to understand. In later
chapters, particular attention is paid to some of the most
challenging and important topics, such as the kA-p theory, the
deformation potential theory, the multiband envelope function
approximation, field quantization, and the emission and absorption
of light in quantum wells. These core topics apply widely, both to
quantum well lasers and to other electronic and optoelectronic
devices. Physics of Strained Quantum Well Lasers will allow the
reader to progress systematically through the text and emerge with
enough knowledge to successfully understand and model strained
quantum well lasers.
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