以單塊準相位匹配非週期及週期性晶體同時在ND:YVO4雷射達成電光Q調製及腔內和頻橘黃光產生;Monolithic aperiodically and periodically poled lithium niobate for simultaneous laser Q-switching and intracavity sum-frequency generation in a dual-wavelength Nd:YVO4 laser

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/53153

Title:	以單塊準相位匹配非週期及週期性晶體同時在ND:YVO4雷射達成電光Q調製及腔內和頻橘黃光產生;Monolithic aperiodically and periodically poled lithium niobate for simultaneous laser Q-switching and intracavity sum-frequency generation in a dual-wavelength Nd:YVO4 laser
Authors:	黃耀賢;Yao-Hsien Huang
Contributors:	光電科學研究所
Keywords:	和頻;鈮酸鋰;Q調製;sum-frequency generation;Q-switching;lithium niobate
Date:	2012-03-07
Issue Date:	2012-06-15 20:12:27 (UTC+8)
Abstract:	由於布拉格繞射對於波長具有相當高的選擇性，此會產生一個單一布拉格結構只對單一波長有好的繞射效率。故本論文使用二維電光非週期性布拉格結構來滿足本論文實驗所需參銣雷射系統中兩種發射頻譜1064nm與1342 nm 的繞射條件，在入射角相同的情況下，可以同時以二維電光非週期性布拉格結構提供不同的倒晶格向量來滿足雙波長的繞射。再者利用鈮酸鋰良好的電光效應，以週期性極化反轉的技術，將前述所計算的二維布拉格結構，製作長2.5公分，寬5釐米，厚500微米的鈮酸鋰晶體，並且串接一週期性結構，長1.5公分，寬5釐米，厚500微米的鈮酸鋰晶體來滿足合頻之需求，使兩者製作於同一晶片上最後於布拉格繞射效率中當加上在量測結果於z方向電場為-250伏特時，1064nm量測到繞射效率為96%，於電壓-350伏特時量測到1342nm的繞射效率為92.5%。在將其放置於Nd:YVO4雷射系統的共振腔中，以電訊號進行Q調製1064nm與1342nm後藉由週期性結構的和頻，達成短脈衝的橘黃光輸出，其脈寬為8奈秒，尖峰功率約為430瓦特，在相位匹配溫度73℃下。Abstract Bragg condition is very sensitive to incident wavelength. With this characteristic, we can diffract wavelength with appropriate Bragg structure. In this letter, we first design an aperiodic structure with the help of simulated anneal algorism which compensates reciprocal vectors of dual wavelength emitted in Nd doped solid state laser system. Lithium Niobate is a great electro-optic crystal. With the high electric field poled, we can generate the structure we calculate previously on LN crystal. Thus, a 25 mm long, 5 mm in width and thickness of 0.5 mm aperiodic poled Lithium Niobate Bragg diffraction cascade 15mm long periodical poled Lithum niobate sum frequency Generation device is fabricated successfully. In experiment, we measured the high diffraction efficiency both on 1064 nm and 1342 nm, 96% and 87% respectively, at –250 and -350 volt applied voltage. Furthermore, we put our chip into the Nd:YVO4 slid sate laser system and applied a periodic electric field to the chip, we can turn it into a cavity Q-switch device. With the sum frequency crystal BIBO, we can generate narrowand high peak power 593 nm output from dual emission wavelength of Nd 1064 nm and 1342 nm. In results, the yellow-orange light output with the pulse width of 8 ns and peak power of 430 W under 8.142 W of Nd absorption power at tempature 73℃.
Appears in Collections:	[Graduate Institute of Optics and Photonics] Electronic Thesis & Dissertation

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