population inversion वाक्य
उदाहरण वाक्य
मोबाइल
- This chromium both gives a ruby its red color and also enables a ruby to undergo a population inversion and act as a laser.
- However, the actual invention of the maser ( and laser ) many years later was dependent on a method to produce a population inversion.
- Some of the light produced by the lamps is captured in the glass, leading to a population inversion that allows for amplification via stimulated emission.
- Technically, the encoding effect proceeds by the creation of a population inversion between the valence and conduction bands, with the resulting creation of plasmons.
- To create a population inversion under these conditions, it is necessary to selectively remove some atoms or molecules from the system based on differences in properties.
- This is important, since any appreciable population accumulating in level 3, the upper laser level, will form a population inversion with respect to level 2.
- The pulse sequence of INEPT, as shown in the diagram, can be read as a combination of spin echo and selective population inversion ( SPI ).
- These gain media could release stimulated emissions between an excited state and a lower excited state, not the ground state, facilitating the maintenance of a population inversion.
- Because at least half the population of atoms must be excited from the ground state to obtain a population inversion, the laser medium must be very strongly pumped.
- The population inversion in hydroxyl molecules is produced by far infrared radiation that results from absorption and re-emission of light from forming stars by surrounding interstellar dust.
- For example, Scully and colleagues were the first to make lasers oscillate without population inversion and have extended the coherent Raman spectroscopy techniques to detect anthrax type endospores.
- By suitable design of the layer thicknesses it is possible to engineer a population inversion between two subbands in the system which is required in order to achieve laser emission.
- This increases the overlap and hence W _ { 32 } which reduces the population inversion, but it increases the strength of the radiative transition and therefore the gain.
- In 1955, Prokhorov and Basov suggested optical pumping of a multi-level system as a method for obtaining the population inversion, later a main method of laser pumping.
- A fundamental characteristic of lasing, like the population inversion, is not actually possible in a two-level system and therefore a two level-laser is not possible.
- The special condition N _ 2 > N _ 1 is known as a population inversion, a rather unusual condition that must be effected in the gain medium of a laser.
- Unlike the usual side-pumping method, the light from a mercury arc lamp was pumped into the end of a very small rod, to achieve the necessary population inversion.
- Gas or gaseous mixtures that may lead to the formation of these molecules is a quasi-ideal laser medium since the population inversion is directly obtained when the excimer is formed.
- Collisional energy transfer between the nitrogen and the carbon dioxide molecule causes vibrational excitation of the carbon dioxide, with sufficient efficiency to lead to the desired population inversion necessary for laser operation.
- Once the plates are flashed and have settled into a population inversion, a small signal from a separate laser is fed into the optical lines, stimulating the emission in the plates.
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