| 摘要 |
A laser configuration is disclosed that generates linear, repeatable, and one-directional frequency modulated chirps by means of a laser cavity whose effective length is varied by employing a combination of a moving special optical element that engages the laser beam twice on each pass of the laser beam through the cavity plus other optical elements such that the laser beam is returned back upon itself, thus rendering ineffective certain errors of position or orientation associated with the motion of the special optical element that otherwise would disturb the established optical alignment of the laser cavity. Equivalent results are obtained with a ring laser by applying similar and corresponding optical features.
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