Heterodyne intermodulation distortion in non-linear combiners. https://ieeexplore.ieee.org/document/4139053
On Sun, Oct 18, 2020 at 11:44 AM H LV <[email protected]> wrote: > 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 <[email protected]> > 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 <[email protected]> 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 <[email protected]> >>> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> >>>>>> 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 <[email protected]> >>>>>>> >>>>>>> >>>>>>> >>>>>>> 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 >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>
