In 1960, Maiman constructed the Ruby laser. It is a three-level solid-state laser and is emitting red light of wavelength 694.3 nm.
Engineering
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Rate of Stimulated emission depends upon the number of atoms present in the excited state as well as the energy density of photons.
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The number of atoms present in the excited state is greater than the number of atoms in the ground state is called population inversion.
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Simple Harmonic Motion (SHM) is when the restoring force is directly proportional to the displacement of the body from its mean position.
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The Programmable Interrupt controller is also known as PIC micro-controller. It is used as interfacing device. It has different operating modes.
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TDMA (Time division multiple access) is used where there is no need for continuous transmission. Due to this it can be used instead of FDMA.
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FDMA allows users to transmit signals simultaneously to satellite transponders with the help of specific frequency to every user in a channel
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In JK flip flop when both J=K=1 the output toggles as long as clock high. This makes the output unstable. This is called race around condition.
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The convolution theorem states that the transform of convolution of f1(t) and f2(t) is the product of individual transforms F1(s) and F2(s).