Definisi: Media gain wis doped karo ion logam transisi. Sawetara media gain laser solid-state didoping karo ion logam transisi, lan transisi sing ditindakake yaiku elektron ing cangkang telung dimensi. Gambar 1 nuduhake ion logam transisi sing umum digunakake lan media inang.
Sawetara ion laser unik yaiku ion kobalt Co2+, ion nikel Ni2+, lan ion wesi Fe2+.
Properti umum saka ion logam transisi yaiku bandwidth panyerepan lan transisi laser sing cocog banget, saengga bisa entuk bandwidth sing gedhe banget. Iki amarga interaksi kuat antarane transisi elektronik lan fonon, nyebabake broadening isotropik. Ion logam transisi laser aktif biasane nggunakake kristal tinimbang kaca tingal minangka media host amarga kristal luwih konduktif termal lan broadening anisotropic spesies kaca uga ora nguntungake.
Laser paling penting adhedhasar media gain ion logam transisi Ti: laser Sapphire, nanging ana uga akeh laser nggunakake media gain kromium-doped, kayata Cr4 +: YAG utawa Cr3 +: LiSAF. Laser sing kurang umum yaiku Co2+:MgF2, Co2+:ZnF2 lan Ni2+:MgF2.
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