We found that porphyrin is a kind of good material for optical limiter.

研究发现，卟啉类反饱和吸收材料有很好的光限幅作用。

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Numerical results show that the performance of systems with optical hard limiter is superior to that without optical hard limiter.

分析结果表明，基于修正素数码的光硬限幅器同步系统的误码性能优于无光硬限幅器系统的误码性能。

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But to date no materials have exhibited strong enough nonlinear response to protect sensitive optical elements from laser-induced damage. , we researched the Graded Density Limiter and Tandem limiter.

为解决现有非线性材料的非线性不能达到有效激光防护效果的问题，我们又研究了串列光限幅器件及浓度剃度光限幅器件的光限幅效率的影响因素。

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But to date no materials have exhibited strong enough nonlinear response to protect sensitive optical elements from laser-induced damage. , we researched the Graded Density Limiter and Tandem limiter.

为解决现有非线性材料的非线性不能达到有效激光防护效果的问题，我们又研究了串列光限幅器件及浓度剃度光限幅器件的光限幅效率的影响因素。

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