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 >>>> >>>> >>>> >>>> >>>> >>>
