以電光非週期性晶疇極化反轉鈮酸鋰光參量產生晶片達成可調式窄頻多波長 光參量震盪器之研究;Tunable narrow-line multi-wavelength optical parametric oscillator in an electro-optical aperiodic poled lithium niobate

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65242

Title:	以電光非週期性晶疇極化反轉鈮酸鋰光參量產生晶片達成可調式窄頻多波長光參量震盪器之研究;Tunable narrow-line multi-wavelength optical parametric oscillator in an electro-optical aperiodic poled lithium niobate
Authors:	曾建豪;Tseng,Chien-hao
Contributors:	光電科學與工程學系
Keywords:	鈮酸鋰;電光偏振模態轉換器;光參量振盪器;LiNbO3;EOPMC;OPO
Date:	2014-08-22
Issue Date:	2014-10-15 14:44:35 (UTC+8)
Publisher:	國立中央大學
Abstract:	光參量振盪器被廣泛的使用在達成波長可調的同調光，而這些光源運用在許多方面，如光譜學、光通訊以及太空遙測。除了波長可調之外，這些應用在操作下也需要較窄頻寬的光源。因此在本篇論文，我們設計並製作出一個單一非週期性極化反轉鈮酸鋰晶片能同時達成頻寬窄化以及可調式多波長的輸出。在系統中包含了用作增益介質的摻釹釩酸釔晶體、作為主動式品質因子調制的週期性反轉鈮酸鋰電光布拉格晶片以及非週期性極化反轉鈮酸鋰晶體作為電光偏振模態轉換器與光參量產生器。在施加Z場在電光布拉格晶片時，可用來繞射1064nm的光來產生脈衝式的1064nm的光源輸出。非週期性極化反轉鈮酸鋰晶片電光偏振模態轉換器被設計用來產生窄頻多波長輸出。當晶片被1064nm泵浦下，施加不同y場將會得到不同的光譜表現。在實驗操作下，電光布拉格晶片操作電壓為170V以及其布拉格角為0.7°。當晶片被1064nm的泵浦下以及沒有施加y場在非週期性極化反轉鈮酸鋰晶片時，產生的光參量震盪的訊號光波長為1532nm。當泵浦為5.083瓦時，產生的尖峰功率為296W、脈寬為3.8879ns以及頻寬為1.5nm。若在其上施加200V/mm的y場時，可產生單根窄化的頻譜輸出，其頻寬窄化成0.2nm。施加400V/mm的y場時，可產生兩根窄化的頻譜輸出，其頻寬窄化成0.2nm以及0.3nm。實驗中量測到的光譜皆與模擬的結果吻合。 ;Optical parametric oscillators (OPOs) have been widely employed to achieve a wavelength tunable coherent light source for various applications such as spectroscopy, communication, and remote sensing. Besides the tunability, a narrow spectral-line operation of the light source is usually demanded for these applications. Therefore, in this thesis, we design and fabricate a monolithic APPLN which can simultaneously achieve bandwidth narrowing and tunable multi-wavelength coherent light output. The laser system consists of three key elements including a Nd:YVO4 as laser gain medium, an EO Bragg PPLN as an active Q-switcher , and an EO APPLN simultaneously as an EO polarization mode converter (EO PMC) and an optical parametric generator. The EO Bragg PPLN is designed to diffract 1064nm light when applying electric field along z direction to pulse the 1064nm light. The APPLN EO PMC is designed to produce narrow-line and multi-wavelength output. When it is pumped by 1064nm and driven by certain electric field along y direction, the output spectrum can be manipulated to desired multi-peak spectrum. In operation, the EO Bragg crystal is driven at 170V and its Bragg angle is 0.7°. Without driving electric field along y axis, the APPLN EO PMC produces optical parametric oscillator’s signal at 1532nm when pumped by pulsed 1064nm. The signal’s peak power is 296 Watts, pulse width is 3.8879 ns and the bandwidth is 1.5nm at diode pump of 5.083 Watts. After driving the APPLN EO PMC in different electric fields along y axis, the laser system can produce different peak numbers, besides of those are the narrow-line signals. When the EO PMC is driven by 200 V/mm along y axis, there is one peak in the spectrum and its bandwidth is narrowed to 0.2nm, which is 7.5 times narrower than the output bandwidth without applying Ey field. When the EO PMC is driven by 400V/mm along y axis, two peaks can be found as the desired design and its bandwidths of 0.3nm and 0.2nm can be obtained. The measurement results are corresponding with the calculated results at certain and designed y field.
Appears in Collections:	[Graduate Institute of Optics and Photonics] Electronic Thesis & Dissertation

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