X-Message-Number: 21580 From: Date: Fri, 11 Apr 2003 05:51:36 EDT Subject: saser --part1_110.224fe888.2bc7ea28_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Gia-Wei Chern et al. give in cond-mat/0301031 a theory of production and propagation of terahertz phonons in semiconductors. I would class this paper as hard, it needs some paper and pencil to be understood. Femtosecond UV laser pulses can excite longitudinal (compression) and lateral (shear) phonon waves in heterostructure semiconductors. From my reading I conclude that in a disordered material such a frozen brain such saser radiation would dissipate well before it can travel beyond some cells length. One possibility is to use phonon solitons, but these would have to propagate in one dimensional structure. This may be achieved by nondispersive beams (hollow beams with special radial energy profile). Given that the intensity interferometer detector is frequency insensitive, it could get the sought after resolution with either phaser (GHz) phonons or saser (THz) ones. Given the knowledge on these system today, no choice can be done, both ways must be explored. Y. Bozzonetti. --part1_110.224fe888.2bc7ea28_boundary Content-Type: text/html; charset="US-ASCII" [ AUTOMATICALLY SKIPPING HTML ENCODING! ] Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=21580