Dual laser stimulation of optical phonons in palladium deuteride

ENVR 50

Dennis Letts, lettslab@sbcglobal.net, 12015 Ladrido Lane, Austin, TX 78727, Dennis Cravens, physics@tularosa.net, Amridge University, P.O. Box 1317, Cloudcroft, NM 88317, and Peter L. Hagelstein, plh@mit.edu, MIT, Cambridge, MA 02139.
In work reported previously (Low-Energy Nuclear Reactions Sourcebook 2008, American Chemical Society, 337-352), two laser beams irradiating a deuterated palladium cathode at a single spot induced significant thermal increases many times larger than expected from laser heating alone. This effect was observed only when the lasers were tuned to produce a beat frequency near specific frequencies (around 8 THz, 15 THz and 20 THz). These preliminary experiments support the conjecture that optical phonons are involved in the heat producing mechanism. In recent experiments, results from more than 20 runs appear to confirm the three thermally sensitive frequencies at 8, 15 and 20 THz. Further, the experiments allowed us to identify the approximate width of each heat-producing frequency and produce a crude thermal response spectrum.