| 摘要 |
An optical or quasi-optical system includes within its optical path a component selected for rapid failure, and reflection and/or refraction means which concentrate a low proportion of the radiation in the optical path at said component whereby in normal usage a high proportion of radiation in the optical path is transmitted and the performance of the system is not excessively degraded, but in abnormal usage when a high energy beam irradiates the system, sufficient energy is concentrated upon the selected component to effect failure.
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