Swoosh. ...that went right over my head. Harry
On Sun., Oct. 18, 2020, 2:43 p.m. Terry Blanton, <hohlr...@gmail.com> wrote: > Heterodyne intermodulation distortion in non-linear combiners. > > https://ieeexplore.ieee.org/document/4139053 > > On Sun, Oct 18, 2020 at 11:44 AM H LV <hveeder...@gmail.com> 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 <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 >>>>>>> >>>>>>>
