端泵固態雷射之模簡併效應

Abstract

本篇論文從實驗上探討模簡併效應對半導體雷射端泵摻釹鋇酸釔雷射輸出的影響。我們發現共振腔腔長調整在模簡併附近時會有雷射輸出總功率增加，基模功率減小，產生複雜的高階模強度分佈，以及功率不穩定的現象。此外，我們亦發現在這些位置雷射具有較低的臨界泵功率。我們的研究顯示在端泵固態雷射的設計中應該考慮模簡併效應所造成的影響。

In this thesis, we study the mode degenerate effects on the output of a Nd: YVO4 laser end-pumped by a diode laser. When the cavity length is adjusted near the position of mode degeneracy we find an increase in total power, a decrease in the fundamental mode power and the instability in output power along with the emergence of multiple transverse modes. Besides, we also find lower threshold pump power taking place a around these positions. this study shows that the mode degenerate effect should be taken into account in the design of end-pumped solid state lasers.