| 摘要 |
PURPOSE:To stably oscillate a high-quality laser beam at a high output by fetching the laser beam output from an oscillating section which oscillates laser light by injecting excitation light into a small area in a solid-state laser medium and an amplifying section which amplifies the laser light under a non-oscillating condition by receiving the oscillated laser light by means of another solid-state laser medium and injecting the excitation light from the side. CONSTITUTION:At an oscillating section 10, excitation light EL is injected at a high density into a small area in a solid-state laser medium 11 and, at the same time, laser oscillation can be started highly efficiently at a low threshold level even though the injected amount of the light EL is small, since the injecting direction of the light EL is equal to the direction of laser resonance. Oscillated laser light L is fetched from the section 10 via a partial reflecting mirror 14 and given to an amplifier section 20 below the section 10 via total reflecting mirrors 31 and 32. The laser light L given to the section 20 from the section 10 is reflected between both reflecting mirrors 22 and 23 and fetched as an laser light output Lo after the light L passes through a solid-state laser medium 21 plural times, for example, three times in this example, along an optical path which is shifted at every reflection and is amplified whenever the light L passes through the medium 21. |
