Hi, When two waves of different frequencies combine the result is a third wave with a beat frequency corresponding to the difference between the two original frequencies. A wave model can show how this happens, but I don't see how it can bring about the addition of frequencies. Can someone model this additive process for me?
Harry On Thu, Oct 15, 2020 at 3:56 PM Bob Higgins <rj.bob.higg...@gmail.com> wrote: > The nonlinearity must be attached to the cathode itself because a THz > signal will not go through even 1 micron of electrolyte. In the > Letts-Cravens-Hagelstein experiment, a tiny amount of gold was added to the > cathode to produce the nonlinearity. Did it work because it formed a diode > junction? Was the nonlinearity plasmon related? That is presently unknown > - but it was produced directly on the cathode, which is the target. > > On Thu, Oct 15, 2020 at 1:50 PM Sean Logan <paco66...@gmail.com> wrote: > >> Sounds fascinating. May I ask: what are you using as your non-linear >> element, to cause the two laser beams to heterodyne? Is it the target they >> shine on, itself? >> >> On Wed, Oct 14, 2020, 15:19 Bob Higgins <rj.bob.higg...@gmail.com> wrote: >> >>> Sean, >>> >>> What you are describing is entirely possible. Also, diode lasers can be >>> driven into modes that produce sidebands just at the threshold of ordinary >>> output - but it is hard to control the sidebands without an expensive >>> "loop" receiver and some kind of lock-in control. >>> >>> Using 2 lasers is pretty easy. I am presently working on a dual laser >>> experiment with 2 tunable diode lasers combined optically onto a single >>> fiber. The wavelength separation (determines the beat frequency) is >>> continuously monitored in a high resolution fiber spectrometer. We are >>> nearly ready to run experiments with this hardware. >>> >>> On Wed, Oct 14, 2020 at 2:10 PM Sean Logan <paco66...@gmail.com> wrote: >>> >>>> Could you use an Optical Parametric Amplifier to create your desired >>>> sidebands? Using one laser as the "signal input" and the other as the >>>> "pump" should give you an output containing sum and difference frequencies >>>> (sidebands, or heterodynes). >>>> >>>> >>>> On Wed, Oct 14, 2020, 12:29 H LV <hveeder...@gmail.com> wrote: >>>> >>>>> In my estimation Rumford's theory is the seed of an alternate theory >>>>> of radiation. It could still grow and blossom into a well >>>>> developed mathematical theory of heat. >>>>> >>>>> I am interested in beat theory because it resonants (pun intended) >>>>> with Rumford`s theory of hot and cold radiation, since >>>>> both involve _differences_. A beat frequency is given by the >>>>> difference of two frequencies and in Rumford`s theory two types of >>>>> differences are important.The first is that the relative difference in >>>>> temperature between two bodies determines which body is producing more hot >>>>> or more cold radiation. The second is that the sign and magnitude of the >>>>> difference between the received frequency and the oscillator's frequency >>>>> determines whether the radiation increases or decreases the energy of the >>>>> oscillator. >>>>> >>>>> Harry >>>>> >>>>> On Tue, Oct 13, 2020 at 3:21 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. >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> *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 >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>
