Excited state absorption and laser potential of Mn⁵⁺-doped Li₃PO₄

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• 作者：Hazenkamp ; M.F. ; G&uuml ; del ; H.U. ; K&uuml ; ck ; S. ; Huber ; G. ; Rauw ; W. ; Reinen ; D.
• 刊名：Chemical Physics Letters
• 出版年：1997
• 期刊代码：7_00092614
• 类别：ph
• 出版时间：January 31, 1997
• 卷：265
• 期：1-2
• 页码：264-270
• 文件大小：467 K

摘要

Excited state absorption (ESA) spectra at room temperature of Mn⁵⁺-doped Li₃PO₄ crystals are reported. A broad and strong (σ_ESA mg align=center border=0 SRC=/images/glyphs/BQ4.GIF> 1 × 10^−18 cm²) ESA band due to the ¹E → ¹T₁ and¹ E → ¹T₂ transitions is observed between 10000 and 15000 cm^−1 which prevents efficient near-infrared pumping for laser operation. For Mn⁵⁺-doped Li₃PO₄ there is no ESA at the stimulated-emission wavelength, in contrast to the laser material Sr₅(VO₄)₃F:Mn⁵⁺. This is due to the higher crystal field strength Δ and the weaker distortion of the host tetrahedron in Li₃PO₄. Finally, the laser potential of Mn⁵⁺-doped materials, in general, is evaluated.