It is also the excited state but having life time of 10-5 to 10-3 seconds. Population inversion occurs only in between the metastable state and
Normally the population density of atoms/electrons is more in the ground state than the excited state. But if the process of stimulated emission dominates over
If the atom is in the excited state E2 and a photon of energy exactly equal to E2 – E1 = hυ is incident on
If the atom in the excited state automatically decays to the ground state by emitting a photon of energy (E2 – E1 = hυ), then
Stimulated Absorption is the starting point to achieve laser. It happens when a photon of light having energy E2 – E1 = hυ (as shown
A laser beam has the following important characteristics: 1. Directionality: An ordinary source of light emits light waves in all the directions and is highly
Nobel laureate Dr. Venkatraman Ramankrishnan received the “General President Gold Medal” from Dr. Manmohan Singh, at the Indian Science Congress in Chenai, India. He told
Our light wave is basically electromagnetic wave (EM) wave, so as the name suggests it consists of elctric and magnetic components. We have 2 electric
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