Patent ID: 8105369

Claim:
A method of treating biological tissue, comprising: providing a fluorescing handpiece system adapted to treat biological tissue, said fluorescing handpiece system comprising: a nonlinear waveguide, the nonlinear waveguide positioned to receive electromagnetic energy from an electromagnetic energy source, the nonlinear waveguide comprising: first and second ends, and a wall extending at least partially therebetween, the wall configured to transmit the electromagnetic radiation therethrough; a passage extending along a direction between said first and second ends; a fluorescent substance flowable within the passage, the fluorescent substance configured to absorb the electromagnetic radiation and generate fluorescent light in response to the electromagnetic radiation; and an input port and an output port in fluid communication with the passage; an optical output element near one of the first and second ends of the nonlinear waveguide; a fluid conduit in fluid communication with the input and output ports; and a fluid circulation system in fluid communication with the first and second ends of the passage; circulating the fluorescent substance from the first end to the second end through the passage and from the second end back to the first end through the fluid conduit with the fluid circulation system; transmitting electromagnetic radiation through the wall of the nonlinear waveguide to the fluorescent substance within the passage; guiding at least some of the fluorescent light emitted by the fluorescent substance in response to the electromagnetic radiation through the nonlinear waveguide towards the optical output element; directing the fluorescent light towards hair with the optical output element; and removing said hair with said directed fluorescent light.