Patent ID: 6906283
Filing Date: 2005-06-14
Classification: A61B,H01S

Abstract:
1. A method for achieving a high-density concentration of laser light from a short-pulse Raman laser light capable of generating a sufficiently broad wavelength and pulse duration to match optical absorption characteristics of a substance having a single-photon absorption wavelength, said concentration sufficient to process or measure the substance at a speed higher than the speed at which thermal effects propagate in the substance to prevent thermal or mechanical deterioration of the surface of the substance, said method comprising adjusting at least one of spatial light convergence, temporal light convergence, and the wavelength of the light to process or measure the substance, wherein flat waveplanes are produced by ensuring that the Raman laser has the same thermal effect on a crystal for a Raman medium as on a conventional laser medium, or by generation of higher order non-linear effects in an area of high optical density, and to yield a high intensity of light convergence and to achieve said spatial convergence; wherein the pulse duration of the light is varied in the range ofpico- to sub-pico-seconds by changing the convergence shape of the light from the pump laser or by changing the shape of the crystal to achieve temporal light convergence; and tuning the wavelength of the light by selecting an appropriate crystal for the Raman medium that emits light at the desired wavelength or by changing the wavelength of a Raman driving light source or a Rarnan pump laser light.