| 摘要 |
PURPOSE:To eliminate an injection laser oscillator and an optical system by a method wherein a wavelength selecting element is provided outside the concave mirror of an unstable resonator and a laser beam with a required wavelength is selectively reflected by the wavelength selecting element and injected into the unstable resonator. CONSTITUTION:When a laser medium 11 starts oscillation, a natural emitted light with a low output intensity and a wide wavelength range is introduced to a prism 6, which is a wavelength selecting element, through the light transmitting part 13b of a concave mirror 13. Only the wavelength component of the natural emitted light which enters vertically to a reflective surface 6a returns into an unstable resonator through the light transmitting part 13b of the concave mirror 13 along the same light path as the incident path and an initial laser oscillation is created between a convex mirror 12 and the prism 6. The light emitted by this oscillation is a single wavelength laser beam and is resonated and amplified between the convex mirror 12 and the concave mirror 13 without changing its spectral properties and outputted from the non-coated part 12b of the convex mirror 12 as a laser beam of high output. |
