Patent ID: 7329251

Claim:
A laser treatment apparatus for performing treatment by irradiating an affected part with a treatment laser beam, the apparatus comprising: a laser source that includes a laser rod for generating beams of a plurality of different wavelengths by excitation light and is capable of selectively emitting treatment laser beams of a plurality of different wavelengths by selectively utilizing the generated beams; a selection unit that selects a treatment laser beam to be used for treatment from among the treatment laser beams of the plurality of different wavelengths by selecting a wavelength; a first setting unit that sets an irradiation amount of the selected treatment beam to be irradiated onto the affected part; an emission amount changing unit that changes an emission amount of the selected treatment beam to be emitted by the laser source in plural levels according to a change in amount of electric current to be applied to the laser source, the emission amount and the change levels thereof according to the electric current amount being different by the wavelength of the selected treatment beam; an optical system including an attenuating unit that gradually attenuates the selected treatment beam emitted by the laser source; and a control part that controls the emission amount changing unit and the attenuating unit based on the irradiation amount of the selected treatment beam set by the first setting unit, wherein the control part controls the emission amount changing unit and the attenuating unit to change the emission amount of the selected treatment beam to a first emission amount and attenuate the first emission amount of the emitted treatment beam to the set irradiation amount when the set irradiation amount of the selected treatment beam is less than a reference value and to change the emission amount of the selected treatment beam to a second emission amount and attenuate the second emission amount of the emitted treatment beam to the set irradiation amount when the set irradiation amount of the selected treatment beam is the reference value or more, the second emission amount being larger than the first emission amount.