研究摻鐿鎢酸釓鉀晶體的自鎖模雷射之特性

Abstract

本論文的目標是研究新的主體材料高功率的端面激發摻鐿雷射為構造，探索他們表 現出的特性與效率。超快雷射允許極短時態的解晰度，速度非常快的重複率，非常寬廣的光譜和高的峰值光強度。因此，目前使用的飛秒脈衝他們被發現應用在各種領域，例如在科學和醫學中許多不同領域，以及在資訊科技和通信。在科學上，超短光脈衝是一個非常有用的工具，研究快速的工序進程使用非常短的時域的解析度。有些實例包括分子動力學、化學反應動力學、載體鬆弛半導體和固態物質的結構變化。除了他們短促的飛秒脈衝開啟了可能性非常高的能量密度甚至能引出相關的效應。在這篇論文中，我們使用了摻鐿鎢酸釓鉀 (Yb:KGW)晶體與自鎖模方法的增益介質創造一個高重複率的脈衝雷射。我們使用增益介質摻鐿鎢酸釓鉀 (Yb:KGW)晶體於不同的腔體設計，研究自鎖模雷射輸出的性能及特性。在實驗中，實現脈衝重複頻率高達幾十GHz。使用雙面鍍膜的摻鐿鎢酸釓鉀 (Yb: KGW)單晶體，實現正交偏振雙波長自鎖模雷射。此外，我們還採用了數學擴展公式的形式並設計實驗實現了超高速的塔爾博特地毯，此實驗是以增益介質雙面鍍膜作為子腔和一外部耦合輸出鏡，形成一個整體腔體，使用外部法布里 - 珀羅腔 (Fabry-Perot cavity)產生自鎖模雷射，此外雙面鍍膜的增益介質以形成單晶體子腔並可發揮標準具的效應實現諧波鎖模。

The objective of this thesis has been to investigate novel host material configurations for high-power, end-pumped Yb-doped lasers in order to explore their performance. Ultrafast lasers allow for extremely short temporal resolution, very fast repetition rate, broad optical spectra and high peak optical intensities. Therefore they are finding application in a variety of fields. Femtosecond pulses are currently used in many diverse areas of science and medicine, as well as in information technology and communications. In science, ultrashort optical pulses are a useful tool to investigate fast processes with very short temporal resolution. Some examples would include the molecular dynamics, chemical reactions dynamics, carriers relaxation in semiconductors and structural changes in solid state materials. Apart from their shortness, the femtosecond pulses create the possibility for extremely high energy density that can even induce relativistic effects .In this thesis, we use Yb:KGW as a gain medium with self-mode-locked method to create a high repetition rate pulsed laser. We use different cavity design of Yb:KGW to study the performance of self-mode-locked laser output. In the experiment, the pulse repetition rate up to ten GHz. Orthogonally polarized dual-wavelength self-mode-locked laser with a Yb:KGW crystal to form a monolithic cavity . Furthermore, we employ the mathematical form of the extended formula to design and realize an ultrafast revival carpet by using a Fabry-Perot self-mode-locked laser with a coated gain medium to form a monolithic sub-cavity. The gain medium is coated to form a cavity mirror and to play an etalon for achieving harmonic mode-locking.