What is a Laser?
(Slide 1)
Laser (noun) is a cheat that creates and amplifies narrow beams of decrease. Laser stands for legerity amplification by stimulate emission, and as the meaning implies it emits light through a accomplish of stimulated emission. The trick to generate a light expiration into hotshot precise direction with the correct arrangement of atoms at the right time and in the right direction.
Three move of a Laser: (Slide 2)
A laser consists of three separate:
- An strength source or a pump is employ to provide the energy from an external source into the gain modal(a) of a laser. This energy is usually provided in the form of light or electric current, but more exotic sources generate been used, such as chemical or nuclear reactions.
- A laser also consists of a gain medium or a laser medium, this is the major determining factor of the wavelength of operation, and former(a) properties, of the laser and it is in the gain medium that the emission of photons enlist place.
- Optical resonator or optical cavity is the close part of the laser.
A simplest example of optical resonator are two parallel mirrors that have divers(prenominal) coatings that give them different properties to reflect light, usually one that is a high reflecting telescope and the other is a low reflector, which results in some of the light to leave the cavity to produce the lasers rig beam.
(Slide 4) Absorption of Light
This is a quantum mechanical phenomena, where light source or energy from the pump or the energy source provides photons in typical lasers that causes the ground atoms to become excited that causes a novelty of atoms or molecules from a lower energy state to a higher energy state. This process results in the atoms absorbing one or more photons resulting in a higher energy atoms or molecules.
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