Examples of stimulated emission in the following topics:
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- A laser is a device that emits monochromatic light through a process of optical amplification based on the stimulated emission of photons.
- It does so through a process of optical amplification based on the stimulated emission of photons.
- This "induced" decay process is called stimulated emission.
- In stimulated emission, the decaying atom produces an identical "copy" of the incoming photon.
- In stimulated emission process, a photon (with a frequency equal to the atomic transition) encounters an excited atom, and a new photon identical to the incoming photon is produced.
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- In an earlier equation, the final term could be important if the $E_i-E_f \approx -\hbar \omega$ this corresponds to stimulated emission of radiation.
- Except for the degeneracy factors for the two states, the Einstein coefficients will be the same, so we can define an oscillator strength for stimulated emission as well,
- We can also separate the emission from absorption oscillator strengths
- Because the second term is for stimulated emission.
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- The positive contributions are true absorption and the negative ones correspond to stimulated emission.
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- Generally material has two routes for the emission of radiation: stimulated emission and spontaneous emission.
- The spontaneous emission is independent of the radiation field.
- Let's define the spontaneous emission coefficient, $j$.
- Often the emission is isotropic and it is convenient to define the emissivity of the material per unit mass
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- Having examined stimulated emission and optical amplification process in the "Lasers, Applications of Quantum Mechanics" section, this atom looks at how lasers are built.
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- You may neglect scattering and assume that the emission is in the Rayleigh-Jeans limit.
- Show that if stimulated emission is neglected, leaving only two Einstein coefficients, an appropriate relation between the coefficients will be consistent with thermal equilibrium between an atom and a radiation field with a Wien spectrum, i.e.
- Compare the power from the surface emission to the power lost as the neutron star spins down.
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- Kirchoff's law yields a relationship between the emission and absorption coefficients for a thermally emitting material, specifically $j_\nu = \alpha_\nu B_\nu$.
- This relationship suggests some connection between emission and absorption at a microscopic level.
- If we calculate the probability of absorption of a photon for example, we can use the Einstein relations to find the rate of stimulated and spontaneous emission.
- Can you use the principle of detailed balance to say anything about the relationship between the stimulating and the stimulated photon?
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- It is usually the result of sexual stimulation, including prostate stimulation.
- Ejaculation may occur spontaneously during sleep (known as a nocturnal emission or "wet dream").
- Ejaculation has two phases: emission and
ejaculation proper.
- The emission phase of the ejaculatory reflex is under
control of the sympathetic nervous system, while the ejaculatory phase is under the control of a spinal reflex at the level of spinal nerves S2 to S4 via the pudendal nerve.
- A refractory period succeeds the ejaculation, and sexual stimulation precedes it.
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- Calculating a ‘carbon footprint' (i.e. the amount of carbon dioxide a process creates) is a trendy way to measure carbon emissions with the added benefit that, when lowered, the numbers can be used in public relations campaigns or to prove compliance with emissions legislation.
- Employees usually enjoy seeing how their efforts help reduce environmental degradation so displaying carbon emission reductions alongside other relevant data can help create motivation and a strong sense of achievement.
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- To reduce the negative impact of their factories, production sites and supply chains, major brands have committed to sustainability targets that aim to reduce their carbon emissions and give back to the larger global community.
- The right marketing stimulates trade.