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