Quasi-resonant nonlinear absorption for optical power limiting: solgel-processed Er~(3+)-doped multicomponent silica glass

Glauco S. Maciel; Abani Biswas; Christopher S. Friend

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Quasi-resonant nonlinear absorption for optical power limiting: solgel-processed Er~(3+)-doped multicomponent silica glass

机译：用于光功率限制的准谐振非线性吸收：溶胶处理的掺Er〜（3+）的多组分石英玻璃

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We demonstrate optical power limiting by what we believe to be a new mechanism of nonlinear absorption, which involves a quasi-resonant ground-state absorption that is either phonon assisted or assisted by the presence of defect sites (tail absorption). Such a mechanism provides high transmittance at low intensity yet optical limiting under cw conditions. The sample used was a novel solgel-processed Er~(3+)-doped multicomponent silica glass. In this system the nonlinear absorption process is achieved because the resonant excited-state (~(4)I_(13/2)→~(4)S_(3/2)) absorption cross section is larger than the quasiresonant ground-state (~(4)I_(15/2)→~(4)I_(9/2)) absorption cross section.

机译：我们通过我们认为是非线性吸收的新机制证明了光功率限制，该机制涉及准共振基态吸收，该吸收是声子辅助或缺陷位点（尾部吸收）的辅助。这种机制可在低强度下提供高透射率，但在连续波条件下具有光学限制。所使用的样品是新型的溶胶凝胶处理的掺Er〜（3+）多组分石英玻璃。在该系统中，由于共振激发态（〜（4）I_（13/2）→〜（4）S_（3/2））的吸收截面大于准共振基态（〜（4）I_（15/2）→〜（4）I_（9/2））吸收截面。

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《Applied optics》 |2000年第15期|共4页
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Glauco S. Maciel; Abani Biswas; Christopher S. Friend;
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1. Quasi-resonant nonlinear absorption for optical power limiting: solgel-processed Er~(3+)-doped multicomponent silica glass [J] . Glauco S. Maciel, Abani Biswas, Christopher S. Friend Applied optics . 2000,第15期

机译：用于光功率限制的准谐振非线性吸收：溶胶处理的掺Er〜（3+）的多组分石英玻璃
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Quasi-resonant nonlinear absorption for optical power limiting: solgel-processed Er~(3+)-doped multicomponent silica glass

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