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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.
Rate of Stimulated emission depends upon the number of atoms present in the excited state as well as the energy density of photons.
The number of atoms present in the excited state is greater than the number of atoms in the ground state is called population inversion.
Simple Harmonic Motion (SHM) is when the restoring force is directly proportional to the displacement of the body from its mean position.
Magnetic Hysteresis Curve represents the relation between magnetizing force (H) and magnetic flux intensity for ferromagnetic material.
Total internal reflection is the complete reflection of a ray of light within the medium.
First posulate of Special theory of relativity is "The laws of physics take the same form in all inertial frames".
Most solid materials show elastic behaviour to a lesser or greater extent.
Compton discovered the most important confirmation about the particle aspect of radiation.
The wave function contains all the information about the particle. It is not an observable quantity.
P-N junction diode is simply a two-terminal device which allows the current to flow in one direction only.
Pumping is the process to achieve population inversion .
Plasticity is the property of the material by virtue of which it does not regain its original shape when applied force is removed.
Helium-Neon Laser laser is a gas laser. In this a mixture of helium and neon gas is used as a gain medium. It was the first continuous-wave laser.
A cable that is used to transmit the data through fibres (threads) or plastic (glass) is known as an optical fibre cable.
The number of atoms present in the excited state is greater than the number of atoms in the ground state is called population inversion.
Heisenberg’s uncertainty principle states that: If the x-component of the momentum of a particle is measured with an uncertainty ∆px, then its x-position cannot, at the same time, be measured more accurately than ∆x = ℏ/(2∆px).