Abstract: A Raman laser device including: a Raman lasing medium adapted to undergo Raman lasing; and at least one pumping beam, for pumping a Stokes seed beam by stimulated Raman scattering whilst it traverses the Raman lasing medium.

Abstract: A method and system for generating a Raman second Stokes light to a source light comprising generating a Raman first Stokes light from the source light by a Raman interaction in a nonlinear optical medium disposed in an optical resonator, and resonating the Raman first Stokes light in the optical resonator; generating a seed light at the frequency of the Raman second Stokes light from the source light and the Raman first Stokes light by a four wave mixing process which is not phase matched in the nonlinear medium; amplifying the seed light by transferring power from the first Stokes light resonating in the optical resonator to the seed light using a Raman amplification process in the nonlinear medium; and extracting from the optical resonator a majority of the power of the seed light so amplified.

Abstract: A method and system for generating a Raman second Stokes light to a source light comprising generating a Raman first Stokes light from the source light by a Raman interaction in a nonlinear optical medium disposed in an optical resonator, and resonating the Raman first Stokes light in the optical resonator; generating a seed light at the frequency of the Raman second Stokes light from the source light and the Raman first Stokes light by a four wave mixing process which is not phase matched in the nonlinear medium; amplifying the seed light by transferring power from the first Stokes light resonating in the optical resonator to the seed light using a Raman amplification process in the nonlinear medium; and extracting from the optical resonator a majority of the power of the seed light so amplified.

Abstract: An exercise device includes an elastic tube and a pair of elongate handles, each conveniently formed as a unitary member with no moving parts, integrally molded of a plastic. Each handle has a generally cylindrical outer surface and a pair of longitudinal slots formed internally of the outer surface in essentially spaced-apart, side-by-side relationship. The internal slots are dimensioned to grip the outer surface of the tube and have internal longitudinal ribs which enhance the gripping effect. A pair of transverse open-ended access slots are formed in the outer handle surface, each accessing one of the internal longitudinal slots to permit insertion and subsequent longitudinal displacement of the tube in the respective internal slot. An end of the tube is inserted transversely into one internal slot, wrapped through a 180 degree bend about a handle portion separating the internal slots, and then inserted transversely into the other longitudinal slot.