摻釹釩酸鹽類晶體之自轉換受激拉曼雷射

Abstract

一般脈衝式雷射對於量測、雷達、醫療等方面的應用都相當廣泛，但其輸出波長有諸多限制，相對在應用上也就被侷限住。因此本文的研究重點就是利用摻釹釩酸鹽類晶體，在雷射共振腔內同時當增益介質以及拉曼晶體，產生自轉換受激拉曼，讓輸出波段可以有更多的選擇，並針對不同的摻釹釩酸鹽類晶體作拉曼散射的研究及討論；其中又以Nd:GdxY1-xVO4 （X＝0.8, 0.6）晶體有較小的有效激發面積的特點，可以成功地產生1175nm拉曼雷射。另外，我們針對Nd:GdVO4 晶體當增益介質，研究連續性1083nm的雷射和1186nm、1197nm的拉曼雷射。

Solid-state lasers are playing an important role in many applications such as range finders, medical systems, and radar. But the output of solid-state laser is generally confined to some specific wavelengths. So applications of solid-state lasers are also restricted. Therefore we think about the influence of using Nd-doped Vanadate crystals as a gain median and Raman crystal simultaneously in the cavity. Solid-state lasers can produce the self stimulated Raman scattering (SRS) conversion, then we will get other wavelengths of laser by the method. We also discuss the self SRS conversion for different Nd-doped Vanadate crystals. In our experiments, a picoseconds diode-pumped passively Q-switched self-SRS laser has been efficiently demonstrated by use of Nd:GdxY1-xVO4 crystals with x=0.6 and x=0.8. In addition, we discuss the cw laser of 1083nm and self-SRS laser of 1186nm and 1197nm by using the Nd:GdVO4 as gain median and Raman crystal.