To provide a continuous oscillation ultraviolet laser device, tuning a specified wavelength in an ultraviolet ray wavelength region or varying a wavelength in a fixed wavelength region.
A laser device includes: a visible laser oscillating part (a laser 1) having a variable wavelength; a laser (a laser 2) generating laser light having a fixed wavelength; and a wavelength converting part (a converting part 1) generating ultraviolet rays by sum frequency wave generation based on the output light (output light a1) of the laser 1 and the output light (output light b) of the laser 2. In the laser device, the laser 1 includes an optical waveguide at least including Pr as a laser medium in a core and a semiconductor laser generating excitation light having a wavelength of 400-480 nm, both inclusive as a pumping source, and ferroelectric fluoride crystal is used for the converting part 1, whereby ultraviolet rays (output light c) having a wavelength of 250 nm or less are continuously output.
OKAMOTO HIDEYUKI
KASUGA TAKESHI
HARA IKUNARI
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