| 摘要 |
The present invention relates to a ring laser in which the amplifying medium has a very small section in a plane orthogonal to the direction of propagation. Each of the windows of the amplifying medium 61 is placed at the focus of a mirror P1, P2 consisting of an off-axis portion of aspherical surface. The cavity is closed by plane mirrors M1, M2, M3. <IMAGE>
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