| 摘要 |
<p>The present invention relates to the multi-pass laser amplification systems, particularly to the method and the device for the multi-pass amplification of laser radiation in optical fibers (1). The method for multi-pass optical amplification comprises the input of the incoming coherent radiation, directing it into the amplifying optical medium (1) and the passage of the said radiation through the said amplifying optical medium two or more times, following the predefined combination of the polarization and propagation direction of radiation, which undergoes amplification, during the said passes, as well as the separation of the amplified radiation from the incoming radiation and its output from the amplifier. In order to extend the range of amplification coefficient values in a single cascade, the radiation, which undergoes amplification, passes through the gain medium two or three or four times, by satisfying the condition that during the passes the same combination of polarization and propagation direction of the radiation, which undergoes amplification, should not be repeated, besides in the entire sequence of the passes there should be at least one time, when the radiation propagates through the gain medium in the same direction two times in series, while the polarization of the radiation, which undergoes amplification, should be rotated by 90 degrees.</p> |
