Unfortunately, at least for electrochemical LENR, the THz radiation will
not penetrate the electrolyte (not even a micron). The dual laser approach
worked because the two red lasers would pass through the electrolyte and
the beat frequency was produced directly on the cathode surface without the
THz beat having to propagate through the electrolyte. However, for that
THz beat to form, a nonlinearity must be present at the surface of the
cathode. If it were linear, then the only frequencies in the output are
those at the input. It is believed that the addition of the thin film of
gold provided the prescribed nonlinearity. When gold goes down at a low
rate, it is possible for it to form micro- or nano-scale islands rather
than a uniform epitaxy of thin gold. These islands could form plasmon or
other resonant effects that could enhance the local nonlinearity - they
could even form metal-oxide semiconductor junctions for the nonlinear
mixing.
OTOH, if you had a gas phase system (perhaps Mizuno-like), a tunable THz
laser would be an excellent stimulation. I am not sure how well direct THz
stimulation would work through a plasma - it may just reflect or be
absorbed in the plasma.
I would love to have a tunable THz laser to try it.
Bob
On Wed, Oct 14, 2020 at 8:39 AM JonesBeene <jone...@pacbell.net> wrote:
>
>
> Good post, Bob
>
>
>
> Because of this effect (Letts/Cravens) and the optical phonon addition of
> Hagelstein and the Holmlid work also – it seems clear that laser
> irradiation of a metal matrix is perhaps the most promising open avenue
> for optimizing LENR gain.
>
>
>
> It would be great if THz lasers were available now at reasonable cost, and
> maybe they will be soon but it seems like this is the stumbling point in
> progress.
>
>
>
> I would like to see what happens if sequential THz pulsing is followed
> closely in time by a UV laser pulse on the exact same area of loaded matrix.
>
>
>
> IOW the Terahertz pulse primes the target for the much more intense
> radiation which follows.
>
>
>
> This could be a shortcut to Holmlid’s claimed proton annihilation instead
> of “mere fusion. “
>
>
>
> proton annihilation… Ha ! what a concept, almost a LOL…
>
>
>
> … and to think it could be generally ignored by the institutionalized
> Fizzix establishment …
>
>
>
> That would be the Science Story of the century. I was hoping to hear from
> Norront this year.
>
>
>
>
>
> *From: *Bob Higgins <rj.bob.higg...@gmail.com>
>
>
>
> 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").
>
>
>
> JonesBeene 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.
>
> *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
>
>
>
>
>
>
>
