Abstract: The laser medical device includes a Nd:YAlO.sub.3 laser crystal; a pumping system which illuminates the laser crystal with light irradiated from a pumping light source and achieves population inversion of Nd.sup.3+ ion in the laser crystal; and a resonant cavity for resonating light emitted from the Nd.sup.3+ ion to output a laser light having a predetermined wavelength, wherein the wavelength of the laser light falls within the transparent range of quartz optical fibers. The laser medical device may also include a quartz optical fiber for transmitting the laser light; an optical fiber injector for focusing the laser light output by the resonant cavity on one end of the optical fiber; and an optical fiber pen which is coupled to another end of the optical fiber for aiming the laser light transmitted through the optical fiber at a desired location of a subject. These devices use Nd:YAlO.sub.3 crystal as an active laser material and output laser light having a wavelength, such as 1341.4 nm and 1079.