Laser stimulation of LENR cells is an interesting subject. These
experiments can probe the underlying mechanisms of LENR itself. One of the
things that has not been characterized in the laser stimulation studies is
the sideband noise of the lasers. All oscillators exhibit sideband noise.
Oscillators are nonlinear electronic/electro-optical circuits. Because of
the internal high Q cavity, the intensity of the oscillation is Q times
higher than the output of the oscillator/laser. This oscillator
nonlinearity causes the noise at baseband to beat up to form sidebands
around the oscillator primary output. Also, any noise or modulation of the
cavity beats to baseband. This means that for a 400 THz red laser, there
could easily be 8-15 THz sideband energy that will mix with the laser's
main component producing 8-15 THz baseband excitation.
So, a single laser excitation is not necessarily a pure 400 THz excitation
- it could directly excite 8-15 THz phonons with its sidebands.
The dual laser experiment is important because it provides a controlled
frequency of THz beat excitation. The LENR output was found to be
triggered only by specific frequencies of the beat signal that happened to
correspond to phonon excitation.
I don't think the phonon correspondence is air-tight because no one
apparently calculates true phonon solutions for the material. If you look
at the acoustic propagation formulation, they begin by expanding the
nonlinear Young's modulus in a series. Then they throw away the nonlinear
terms of the series and use a linear representation of the Young's
modulus. Because of this, true phonon solutions will not emerge from the
equations because phonons are soliton solutions. Soliton solutions
*require* a nonlinear medium which the present formulations of the
acoustics do not represent (by choice because they cannot solve the
nonlinear formulated equation). Yes, you can find singularities in the
solutions of the linear formulations and say that's where the phonons must
lie - but it is only an approximate guess ("thar be dragons").
On Tue, Oct 13, 2020 at 1:21 PM JonesBeene <jone...@pacbell.net> wrote:
>
>
> The beat frequency they were after was in the THz range and this was in
> order to fit Hagelstein’s theory of optical phonons –
>
>
>
> … and yes - small gain was seen.
>
>
>
> However, in the earlier similar work without beat frequencies – single
> laser only - much higher gain (order of magnitude more) has been reported
> by Letts/Cravens.
>
>
>
> The reproducibility was apparently better in the later experiments - but
> I do not think the lower result with the beat frequency is leading
> anywhere.
>
>
>
>
>
>
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> *From: *H LV <hveeder...@gmail.com>
>
>
>
> Beat frequencies of two lasers irradiating a surface appear in
>
> _Stimulation of Optical Phonons in Deuterated Palladium_ by Dennis Letts
> and Peter Hagelstein
>
> https://www.lenr-canr.org/acrobat/LettsDstimulatio.pdf
>
>
>
> Harry
>
>
>
>
>
