What are conditions for light amplification?

In order to make N1 and N2 constant, number of upward transition must be equal to number of downward transitions. From equation (1) and (2) it is observed that to achieve stimulated emission exclusively, radiation density should be high and N2>N1. That means more atoms should be present in higher energy state.

What is light amplification?

Light amplification is the process of intensifying the amplitude of an electromagnetic light wave. Laser amplification is associated with the linear polarization which occurs due to first-order atomic susceptibility in an optical medium.

What are necessary conditions for laser?

(i) the system must be in a state of population inversion. (ii) the excited state of the system should be in metastable state. (iii) the atom should be in lower energy state.

Which of the following is responsible for amplification of light in laser?

Light Amplification by Stimulated Emission of Radiations
Explanation: LASER is a short form of Light Amplification by Stimulated Emission of Radiations. Stimulated Emission is the process by which amplification of radiations takes place. Hence the meaning of LASER that the light is amplified by stimulating the emission of radiations.

What are the required conditions for stimulated emission to dominate spontaneous emission?

The mechanism by which stimulated emission can be made to dominate is to have more atoms in the excited state than in the lower energy state, so that emitted photons are more likely to stimulate emission than to be absorbed.

How is light amplification by stimulated emission radiation?

Light Amplification by Stimulated Emission of Radiation (laser) is a coherent, convergent, and monochromatic beam of electromagnetic radiation. Various laser sources have been applied in LAM to preheat the workpiece including CO2 lasers, solid state lasers, and excimer lasers. The excimer laser is a gas laser.

Why do we need stimulated emission for light amplification?

Stimulated emission can provide a physical mechanism for optical amplification. Since more atoms are in the excited state than in the ground state then an amplification of the input intensity results.

What are the three important criteria for making a laser?

A laser is constructed from three principal parts:

• An energy source (usually referred to as the pump or pump source),
• A gain medium or laser medium, and.
• Two or more mirrors that form an optical resonator.

Which is the key factor of laser light?

The laser cavity length and the wavelength of the light interact to produce longitudinal modes of energy distribution in the beam, but the resonator design is a key factor in determining the intensity distribution across the width of the beam, and the rate at which the beam diverges.

Why do we need Stimulated Emission for light amplification?

How is light amplification by Stimulated Emission radiation?

How does stimulated emission produce light amplification?

Some of these photons are absorbed by the atoms in the ground state and the photons are lost to the laser process. However, some photons cause stimulated emission in excited-state atoms, releasing another coherent photon. In effect, this results in optical amplification.

What is light amplification by Stimulated Emission?

Light amplification by stimulated emission of radiation or laser is a coherent, convergent, and monochromatic beam of electromagnetic radiation with a wavelength ranging from ultraviolet to infrared [11 ].

What is laser light amplification?

Light amplification by stimulated emission of radiation (laser) emits radiation much different from that by other sources. The emitted laser light is notable for its high degree of spatial and temporal coherence, unattainable using other technologies.

What are the conditions for interference of light?

Conditions for Interference of Light 1 (1) The two sources of light should be coherent sources. 2 (2) The two sources should be very fine and small. 3 (3) The two sources should be very close to each other. 4 (4) The amplitude of the two waves should be equal or nearly equal.

What is amplification and how does it work?

Amplification is carried out using amplifiers which receive electromagnetic input signal and generate an output signal with higher optical power. Most of the optical amplifiers are laser amplifiers that carry out amplification based on stimulated emission.