https://en.wikipedia.org/wiki/Stimulated_emission
Stimulated emission is the process by which an incoming photon of a specific frequency can interact with an excited atomic electron (or other excited molecular state), causing it to drop to a lower energy level. The liberated energy transfers to the electromagnetic field, creating a new photon with a frequency, polarization, and direction of

https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electro-Optics/Direct_Energy_(Mitofsky)/07%3A_Lamps%2C_LEDs%2C_and_Lasers/7.01%3A_Absorption%2C_Spontaneous_Emission%2C_Stimulated_Emission
The processes of absorption, spontaneous emission, and stimulated emission are illustrated by energy level diagrams in Fig. 7.1.2. Energy is on the vertical axis, and nothing is plotted on the horizontal axis. Only two energy levels are shown, so this diagram illustrates only a small fraction of possible energy levels of a material.

https://www.britannica.com/technology/stimulated-emission
Learn how stimulated emission works in laser action, according to Albert Einstein's theory. Find out how coherent monochromatic light is emitted by forcing atoms to return to normal state.

https://www.rp-photonics.com/stimulated_emission.html
Learn what stimulated emission is, how it differs from spontaneous emission, and how it is used in lasers and optical amplifiers. See illustrations, equations, and answers to common questions about this quantum effect.

https://physicswave.com/spontaneous-emission-and-stimulated-emission/
Learn the difference between spontaneous emission and stimulated emission of light by atoms, and how they are related to laser formation. See definitions, examples, diagrams and FAQs on this topic.

http://hyperphysics.phy-astr.gsu.edu/hbase/mod5.html
Stimulated Emission If an electron is already in an excited state (an upper energy level, in contrast to its lowest possible level or "ground state"), then an incoming photon for which the quantum energy is equal to the energy difference between its present level and a lower level can "stimulate" a transition to that lower level, producing a second photon of the same energy.

https://www.nagwa.com/en/explainers/378138614013/
The typical timescale for spontaneous emission is 1 0 s. Stimulated emission is a process in which an excited electron may interact with a photon, which causes the electron to move to a lower energy state and emit a photon. For this process to occur, the interacting photon must have an energy 𝐸 = 𝐸 − 𝐸 p .

https://phys.libretexts.org/Bookshelves/Quantum_Mechanics/Essential_Graduate_Physics_-_Quantum_Mechanics_(Likharev)/09%3A_Elements_of_Relativistic_Quantum_Mechanics/9.03%3A_Photon_Emission-_Spontaneous_and_Stimulated
According to the second of Eqs. (19), at the photon emission, the final field state has to be the Fock state with n′ = n + 1, and Eq. (55) yields Γe = (n + 1)Γs. Thus the initial field increases the photon emission rate; this effect is called the stimulated emission of radiation. Note that the spontaneous emission may be considered as a

https://quantum.lassp.cornell.edu/lecture/stimulated_emission_and_absorption
Learn how a two-state model of ammonia can explain stimulated emission and absorption of microwaves. See how the electric field shifts the energy levels and affects the dynamics of the molecule.

https://www.nature.com/articles/ncomms14000
Stimulated emission is the process fundamental to laser operation, thereby producing coherent photon output. Despite negatively charged nitrogen-vacancy (NV−) centres being discussed as a

https://spie.org/publications/spie-publication-resources/optipedia-free-optics-information/fg12_p02_spontaneous_and_stimulated_emission
Learn the difference between spontaneous and stimulated emission of laser-active atoms or ions, and how they are related to laser gain and population inversion. This excerpt from Field Guide to Lasers by Rüdiger Paschotta explains the physical basis of light amplification.

https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electro-Optics/Direct_Energy_(Mitofsky)/07%3A_Lamps%2C_LEDs%2C_and_Lasers/7.03%3A_Devices_Involving_Stimulated_Emission
Lasers are devices that produce optical energy through stimulated emission and involve optical feedback. The word laser is an acronym for Light Amplification by Stimulated Emission of Radiation. Lasers come in a wide range of sizes and shapes. Some lasers produce continuous output power, denoted cw for continuous wave, and other lasers operate

https://www.britannica.com/science/light/Emission-and-absorption-processes
In stimulated emission the presence of photons with an appropriate energy triggers an atom in an excited state to emit a photon of identical energy and to make a transition to a lower state. As with absorption, the probability of stimulated emission is proportional to the intensity of the light bathing the atom. Einstein mathematically

https://www.sciencedirect.com/topics/engineering/stimulated-emission
Stimulated emission is the effect that if a photon of energy is incident to a particle that is in an excited state, with a certain probability, the particle changes to a lower energy state by emission of a second photon of the same frequency, phase, direction, and polarisation. That is, if only stimulated emission occurs, the resulting light is

https://www.youtube.com/watch?v=YHmGNDMV1cY
137 - Stimulate EmissionIn this video Paul Andersen explains how stimulated emission can be used to create coherent light. When an atom absorbs a photon it

https://physics.stackexchange.com/questions/536088/why-does-stimulated-emission-happen
Same for stimulated emission. An incoming photon "shakes" an excited atom, which then emits duplicated photon, which in turn shakes other atom, and process repeats further inducing stimulated emission avalanche, until all excited atoms go back to ground state. But then they are excited again by an external light source or by other means, and

https://www.britannica.com/technology/laser/Fundamental-principles
Stimulated emission produces a second photon identical to the one that stimulated the emission, so the new photon has the same phase, wavelength, and direction—that is, the two are coherent with respect to each other, with peaks and valleys in phase. Both the original and the new photon can then stimulate the emission of other identical photons.

https://www.nature.com/articles/s41565-022-01092-6
Stimulated emission now helps tailoring spontaneous emission from a ladder-type three-level system in a single epitaxial quantum dot for bright polarized sources with a high photon purity and

https://physics.aps.org/story/v15/st4
Emission became self-sustaining as radiation from molecules in the cavity stimulated further radiation from the continuously renewed supply of excited molecules. Radiating at a wavelength of a little over one centimeter, the power of this first maser was tiny, some ten nanowatts.

https://arxiv.org/abs/2406.16931
View a PDF of the paper titled Stimulated emission of virtual photons: Energy transfer by light, by Lorenz S. Cederbaum and Alexander I. Kuleff. View PDF HTML (experimental) Abstract: Energy-transfer processes can be viewed as being due to the emission of a virtual photon. It is demonstrated that the emission of virtual photons and thus of

https://lasers.llnl.gov/education/nifs-guide-how-lasers-work
A mirror on one side of the laser's optical material bounces the photon back toward the electrons. The space between mirrors, or the "cavity," is designed so the photon desired for the particular type of optical gain medium are fed back into the medium to stimulate the emission of an almost exact clone of that photon.

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https://www.uthsc.edu/surgery/education-training/documents/va-urology.pdf
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https://blountmemorial.org/s_3_pp_153_p_524
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