大光束端泵浦摻釹釩酸釔雷射在簡併共振腔

Abstract

我們分別從實驗與模擬去試圖了解當我們用大光束端泵浦摻釹釩酸釔雷射時，在簡併共振腔下的雷射行為。我們發現橫模間的交互作用會使得雷射輸出出現不穩定。而從實驗與模擬，我們都發現從穩定到不穩定間的第二閥值對腔長作圖是一個V形的曲線。而該V形曲線的特性與輸入功率跟端泵光束大小有關。同時我們也發現在該雷射系統中存在數種動態行為，包括渾沌、脈衝等，我們也利用模擬畫出各種動態行為所存在的區域。

The behavior of the axially pumped Nd:YVO4 laser with large pumping spot size is experimently and numerically studied. We show that the instability of this laser system is due to transverse mode beating. We found that there is a V-shaped second threshold of quasi-periodic which agrees with our simulation result. The character of the V-shaped depends on both the pumping power and pumping spot size. In addition, we also observed several kinds of laser dynamics and the instability regions they exit, such as chaos, modulated pulsation, and quasi-period.