The invention discloses a method for obtaining high-power
ultraviolet laser light, which is realized by an annular cavity structure. The annular cavity structure is surrounded by at least three endoscopies, wherein the first
endoscopy and the second
endoscopy are oppositely arranged on the
optical axis of an all
solid-state
laser, the normal lines of the first
endoscopy and the second endoscopy and the
optical axis respectively form an angle of 1-89 degrees;
double frequency multiplication crystals and
multiple frequency multiplication crystals are arranged between the first endoscopy and thesecond endoscopy; the other endoscopies are arranged above one side of the
double frequency multiplication crystals and
multiple frequency multiplication crystals; the third endoscopy is arranged on piezoelectric ceramics; base-frequency
laser light emitted from the all
solid-state laser is transmitted to the
double frequency multiplication crystals to be subjected to double frequency multiplication by the first endoscopy, and
triple frequency multiplication or quadruple frequency multiplication is carried out by the
multiple frequency multiplication crystals to obtain the
ultraviolet laser light; the double frequency multiplication
laser light which is not converted is subjected to
cycling frequency multiplication along each frequency multiplication
crystal and each endoscopy in the annular cavity structure to generate high-power
ultraviolet laser light; and the high-power
ultraviolet laser light is output by any endoscopy. Thus, the double frequency multiplication laser is utilized by 100%, the ultraviolet conversion efficiency is improved, the
crystal damage is avoided, and the high-power
ultraviolet laser light can be obtained under certain injection power.