以體積全像布拉格光柵為反射鏡之單縱模波長可調式V型共振腔鈦藍寶石固態雷射研究;Tunable V-shaped Cavity Single Longitudinal Mode Ti:sapphire Solid-State Laser System Using Volume Bragg Grating as Laser Mirror

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题名:	以體積全像布拉格光柵為反射鏡之單縱模波長可調式V型共振腔鈦藍寶石固態雷射研究;Tunable V-shaped Cavity Single Longitudinal Mode Ti:sapphire Solid-State Laser System Using Volume Bragg Grating as Laser Mirror
作者:	江承燁;Cheng-yeh Chiang
贡献者:	光電科學研究所
关键词:	體積全像布拉格光柵;鈦藍寶石;可調式雷射;Volume Bragg Grating;Ti:sapphire;tunable laser
日期:	2008-10-15
上传时间:	2009-09-22 10:36:15 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本論文先說明目前常見的可調式雷射系統所應用之元件，由於其元件都必須置入共振腔中以達到調變雷射波長及模態選擇之目的，卻同時提高系統之損耗、降低輸出功率之效率，因此以一個新的光學元件--體積全像布拉格光柵(Volume Bragg Grating, VBG)，其利用滿足布拉格條件調變入射角使之對應到不同的雷射波長，同時具有波長選擇與縱模選擇的功能，取代目前使用在可調式雷射系統的元件。本實驗設計了三個共振腔的形式，線型共振腔分別以平面鏡以及VBG作為輸出端，V型共振腔以體積全像布拉格光柵(VBG)為反射鏡，以及具有波長700 nm~1100 nm增益光譜範圍的鈦藍寶石晶體為增益介質，形成一個改變頂角大小以選擇波長機制的可調式雷射系統。使用不同的光學儀器量測此系統下雷射光的特性，經由光譜儀證明調變範圍可由783.5 nm到741.6 nm，可調的範圍至少超過43 nm，並且由Fabry-perot 干涉儀測得在特定條件下的輸出功率下雷射輸出可維持單縱模的行為，並且光的空間模態形狀非常接近高斯光束的分佈行為。Lasers with narrow linewidth and wavelength tunability are important for spectroscopy applications. To reach such performance, several methods with different optical elements have to be introduced to the cavity designs. However, the insertion of these optical elements gives extra loss to the cavity and results in alignment complexity. A new optical element, Volume Bragg Grating (VBG), can work as a wavelength tuning and mode selection element at the same time inside the cavity to achieve desired laser performance. This thesis demonstrated three types of laser cavity designs. Linear cavity setup used dielectric mirror and VBG as the output coupler. V-shaped cavity setup used VBG as laser folding mirror and dielectric mirror as the output coupler. Ti:sapphire crystal was chosen to be the gain medium since it has an extensively large laser tuning range from 700 nm to 1100 nm. The V-shaped cavity setup achieved tuning range from 783.5 nm to 741.6 nm by using one single VBG which has its central reflection wavelength at 790.3 nm. Laser output performance including Fabry-Perot interference spectral measurement, laser threshold, slope efficiency, and M2 measurement were analysed in detail.
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