- Nonlinear optical process
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In atomic physics, two-photon absorption (TPA or 2PA), also called two-photon excitation or non-linear absorption, is the simultaneous absorption of two photons of identical or different frequencies in order to excite an atom or a molecule from one state (usually the ground state), via a virtual energy level, to a higher … 展开
Two-photon absorption is a nonlinear optical process dependent on the third-order nonlinear susceptibility. The relationship between the number of photons - or, equivalently, order of the electronic transitions - … 展开
Until the early 1980s, two-photon absorption was used as a spectroscopic tool. Scientists compared the one-photon absorption and two-photon … 展开
The two-photon absorption coefficient is defined by the relation
$${\displaystyle -{\frac {dI}{dz}}=\alpha I+\beta I^{2}}$$ 展开To some extent, linear and 2-photon absorption strengths are linked. Therefore, the first compounds to be studied (and many that are still studied … 展开
The opposite process of two-photon absorption is two-photon emission (TPE), which is a single electron transition accompanied by the emission of a photon pair. The energy of each … 展开
CC-BY-SA 许可证中的维基百科文本 multiphoton absorption – two-photon, three-photon …
Such nonlinear absorption processes are called multiphoton absorption (or multi-photon absorption). The simplest variant is two-photon absorption, where only two photons are required.
Review of multiphoton absorption in crystalline solids
An extensive review of theoretical and experimental investigations conducted over the last two decades since the advent of the laser and relating to the simultaneous absorption of one or …
Multiphoton Absorption - an overview | ScienceDirect Topics
Multiphoton absorption (MPA) involves several virtual intermediate states for the simultaneous absorption of multiple photons. For short-pulsed (sub nanoseconds to few picoseconds) high …
Multiphoton Absorption - an overview | ScienceDirect Topics
Multiphoton absorption is the term used to describe a process in which an atom or molecule makes a single transition between two of its allowed energy levels by absorbing the energy …
Multiphoton Processes | part of Photonics, Volume 1: …
More recently, multiphoton absorption has found widespread application at the interface between the physical and life sciences through its ability to provide inherent confocal resolution in …
Perovskites: Multiphoton Absorption and Applications
2021年5月8日 · This review is focused on their multiphoton absorption (MPA) and applications. All the MPA coefficients or cross-sections reported in the literature are summarized. Many experimental data show that the MPA strengths of …
Multiphoton absorption with Laguerre-Gaussian beams
2024年8月9日 · In our work, we focus on multiphoton absorption, where multiple photons are simultaneously absorbed to excite an atom or molecule to a higher energy level, which is only …
Giant multiphoton absorption in silicon - Nature Photonics
2018年2月26日 · However, THz waves can enable giant multiphoton absorption in phosphorus-doped silicon, having shallow donor states and extended wavefunctions. Phosphorus is the …
nonlinear absorption – two-photon absorption, …
A typical nonlinear absorption process is two-photon absorption (TPA). Here, the energies of two photons are combined to excite a single electron into a higher state – e.g. above the band gap of a semiconductor .
