Abstract: A system, method and apparatus for transmission of optical signal in which two laser beams, operating at different frequencies, travel nearly loss-free and shape-invariant within an absorbing medium whereby the nonlinearity of the beams cause an adiabatic interaction of their optical pulses to maintain signals that modulate one of the beams. The adiabatic interaction of the two beams results in shape-preserving pulses called adiabaton pairs to form within the beams within the absorbing medium.

Abstract: Arrangements are disclosed for generating a well defined traveling wave beam substantially unaffected by diffractive spreading. In different embodiments, the beam can be an electromagnetic wave, particle beam, a transverse beam, a longitudinal beam such as an acoustic beam, or any type of beam to which the Helmholtz generalized wave equation is applicable. Pursuant to the teachings herein, a beam is generated having a transverse dependence of a Bessel function, and a longitudinal dependence which is entirely in phaser form, which results in a beam having a substantial depth of field which is substantially unaffected by diffractive spreading.

Abstract: Arrangements are disclosed for generating a well defined traveling wave beam substantially unaffected by diffractive spreading. In different embodiments, the beam can be an electromagnetic wave, particle beam, a transverse beam, a longitudinal beam such as an acoustic beam, or any type of beam to which the Helmholtz generalized wave equation is applicable. Pursuant to the teachings herein, a beam is generated having a transverse dependence of a Bessel function, and a longitudinal dependence which is entirely in phaser form, which results in a beam having a substantial depth of field which is substantially unaffected by diffractive spreading.

Abstract: Short electromagnetic pulses, preferably optical pulses each of a different wavelength and/or polarization, are injected into a channel containing a medium with many energy levels in which the level populations are specified and in which the transitions between levels are in resonant relationship (resonant or nearly so) with the carrier frequencies of the pulses. When the initial pulse intensities are above a level related to characteristics of the medium, particularly when the areas of the pulses have certain relationships with each other, coincident pulses co-propagate simultaneously, substantially losslessly, and in some cases at velocities well below normal light speed in the medium, but still well above electron drift speeds in conductors, for example. The pulses may be very short in duration.