Did Boscovich subscribe to a wave or a particle view of light? I wonder if electrons are "elementary points" and protons are "first order particles" in Boscosvich's scheme. https://youtu.be/w1vi0yk7BvU?t=248
harry On Fri, Apr 29, 2022 at 8:28 AM ROGER ANDERTON <r.j.ander...@btinternet.com> wrote: > Also > > (i) Boscovich theory led to Quantum theory -> > https://www.youtube.com/watch?v=w1vi0yk7BvU > > > (ii) Einstein working from Boscovich theory -> > https://iopscience.iop.org/article/10.1088/1742-6596/2197/1/012002/meta > > > So progression from 18th century theory of Boscovich to modern physics > > > > ------ Original Message ------ > From: "H LV" <hveeder...@gmail.com> > To: vortex-l@eskimo.com > Sent: Friday, 29 Apr, 22 At 13:19 > Subject: Re: [Vo]:Stimulated emission and Pre-Quantum Physics > > > On Thu, Apr 28, 2022 at 5:44 PM Vibrator ! <mrvibrat...@gmail.com> wrote: > >> > I have been doing more reading about the history of stimulated >> > emission. Einstein formally introduced a quantum version of the concept >> in >> > 1917. >> > Therefore you might think that it is only possible in a quantum >> theoretical >> > context. However, subsequent mathematical work has shown that a form of >> > stimulated emission can also arise in a classical (pre-quantum) setting >> > when a suitable model of the atom is used. >> >> The key point about stimulated emission is that it exploits the >> suspension of superposition exclusion to enable an aggregate system to >> cohere under a unitary wavefuntion; the corollary effect being coherent >> absorption, such that the initial plasma system can be classically >> described right up to the population inversion: from which point all >> electrons are bouncing between peak energy and stable bottom, emitting and >> absorbing essentially the same photons in sync.. >> >> ..so the quantum / classical threshold there is Pauli exclusion; the >> spontaneous photomultiplication resulting from collective coherence of the >> electron population is a pretty fundamental kind of 'resonance', not your >> average harmonic oscillator. >> >> On this key point about coherent absorption as well as emission, see >> Green at al "Limiting photovoltaic monochromatic light conversion >> efficiency" 2001, noting that in PV cells for which recombination is mainly >> radiative, a stimulated emission regime could take efficiency arbitrarily >> close to the Carnot limit; his team down in Oz are currently up to ~70% - >> again, for monochromatic (basically laser) light - with increasing >> applications in ie. wireless power transmission, electrical isolation / >> firewalling etc., and obvs much greater range (albeit limited to LoS) than >> classical inductive transmission techniques. >> >> A stimulated emission mode / regime is an inherently quantum-classical >> system, a unique means of corralling quantum systems distinct from Faraday >> and Maxwell et al; the system's propensity to begin lasing a direct >> consequence of the quantisation of energy & momentum: in the tensioned >> 'population inversion' state, ideally at least, a single photon of further >> input energy will inevitably trigger a cascade of absorption and emission >> because there's nowhere else for this conserved quantised energy to go, ie. >> further input energy catalyses a cyclic phase transition between high and >> low-energy states, because the transitions are quantised, and because a >> whole bunch of fermions are behaving as a kind of extended quasi-boson, >> holding the same quantum-energy states at the same time. >> >> It's that force-feedback dynamic, like a turbine, generating this >> low-entropy livewire state of perfect photoelectric synchrony.. coherent >> emission AND absorption, en masse.. >> >> On a bit of a tangent perhaps, but in his later years GC Huth posited >> that the retinal cells of the fovea may form a kind of phase-conjugate >> mirror, which may have thought-provoking implications for ie. the nature of >> eye contact between sentients, optic nerves essentially being extensions of >> cortex: what if electrons in remote rhodopsin discs are entangled by the >> same photons? 'A twinkle in the eye'.. 'windows on the soul'.. (woo-wavy >> hands) >> > > Interesting read. > Did you read Bill's post? There are many classical systems which exhibit > stimulated emission which don't depend on quantum theory. Radiation > theorists of the second half of the 19th century appeared to dislike the > notion of anything resembling stimulated or induced emission even though it > did not violate the laws of physics. Perhaps the concept of stimulated or > induced emission was in conflict with Victorian sensibilities. > > here is an example > Absorption and Stimulated Emission by a Thin Slab Obeying the Lorentz > Oscillator Model > https://iopscience.iop.org/article/10.7567/1347-4065/ab2cc6 > > Harry > >
