Quantum Electronics E-BOOK

Quantum Electronics is that discipline of Physics which deals
with the impact of quantum mechanics on the specific behavior
of electrons in elements or that of any matter. To get an in
depth understanding of the quantum electronics as a whole, it
is required that atomic physics, which studies and explains the
inner workings of atoms in matter, has to be understood very
well. Atomic Physics is widely acclaimed as the most active of
the testing grounds of the quantum theory and is rightly the
field of extensive research for both its contribution to quantum
electronics and technology in general, as well as for its
contribution to all physics fundamentally. Not only quantum
electronics, but a plethora of other disciplines are heavily
indebted to Atomic Physics in that regard, some of them are
quantum chemistry, astrophysics, solid-state physics, laser
physics etc. According to one of the greatest pioneers of
quantum mechanics, Mr. Feynman, if for some reason, all the
information regarding science that is known to man today has
to go except only one sentence that could be passed on to the
next generation of creatures, then the most important of all
information to fit into that one sentence would be the idea of
atoms or atomic hypothesis / fact, whichever you want to call
it - that describes little particles that are under constant
movement and attracting each other if apart and repelling each
other when squeezed- With a little bit of thinking and
imagination applied to that one sentence, one can easily observe
the huge information as well as the great evaluation made
about our world! The primary task of Atomic Physics is to
determine the wave functions as well as the energies emitted
out of the quantized electron, leaving everything else related to
the nucleus is left to Nuclear Physics to determine. So, for
concept building we need to put stress on the basics of atomic
physics before moving on the applications of Quantum
Electronics.
Generation and direct amplification of short laser pulses with
high output energies requires the use of amplifiers and other
large-aperture components, which greatly increases the difficulties
encountered in construction of suitable systems and, in the final
analysis, their cost. The progress made in the generation of
maximum pulse intensities shows that the application of
enhancement and compression has raised the intensity of
chirped pulses.In the interaction of ultra-short pulses with solid
targets, the contrast of such pulses should be sufficiently high
to ensure that plasma does not form before the main pulse
arrives on a target. The contrast may be improved by several
factors, which manifest themselves in different ways at different
time intervals. On the microsecond scale, the contrast may be
reduced by super-luminescence of laser amplifiers, which can be
eliminated effectively by a variety of methods such as spatial
filters, optical switches.