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    • 3. 发明授权
    • Gaseous laser power limiter initiated by nuclear radiation
    • 气体激光功率限制器由核辐射发起
    • US5299068A
    • 1994-03-29
    • US511161
    • 1990-04-19
    • David B. CohnMichael J. NicolMitchell B. Haeri
    • David B. CohnMichael J. NicolMitchell B. Haeri
    • H01S3/00G02F1/36G02B5/23
    • H01S3/0064
    • A laser protection device employing a gas plasma switch wherein applied laser radiation is focused inside a gas chamber, and a nuclear source is employed to pre-ionize the gas volume, whereupon focused laser radiation causes gas breakdown and plasma formation that attenuates the radiation. Specifically, the invention reduces the threshold of plasma switch initiation by incorporating a nuclear source within the gas chamber that constantly injects plasma forming seed particles into the vicinity of a focused laser beam. The plasma resulting from avalanche ionization of the seed particles reflects, absorbs and deflects the laser radiation. The nuclear source introduces charged particles, excimers and metastable atoms with low ionization potential into the gas chamber. Such charged particles are effective plasma initiators because they have low ionization thresholds. The present invention has been found well suited to protect against pulsed laser sources because of fast rise times and high attenuation levels. The present invention has negligible insertion loss, fast rise time on order of 5 nsec, passive operation requiring no input power using laser initiated plasma, it operates in stand-by and is ready for operation at all times, and provides broadband protection for all wavelengths greater than about 1 .mu.m.
    • 使用气体等离子体开关的激光保护装置,其中施加的激光辐射聚焦在气体室内,并且使用核源来预先电离气体体积,由此聚焦的激光辐射导致气体分解和等离子体形成,其衰减辐射。 具体地说,本发明通过将气源室内的核源不断地注入等离子体形成种子颗粒到聚焦激光束附近来降低等离子体开关起始阈值。 由种子颗粒的雪崩电离产生的等离子体反射,吸收和偏转激光辐射。 核源将具有低电离电位的带电粒子,激发子和亚稳原子引入气室。 这种带电粒子是有效的等离子体引发剂,因为它们具有低电离阈值。 已经发现本发明非常适合于防止脉冲激光源,因为快速上升时间和高衰减水平。 本发明具有可忽略的插入损耗,5ns的快速上升时间,使用激光发射等离子体的无源输入功率的无源操作,它在待机状态下工作,随时准备运行,并为所有波长提供宽带保护 大于约1(我)m。