以串級式電光週期性晶格極化反轉鈮酸鋰達成三波長主動式Q-調制Nd:YVO4雷射

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姓名

張煒堃(Wei-Kun Chang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

以串級式電光週期性晶格極化反轉鈮酸鋰達成三波長主動式Q-調制Nd:YVO4雷射
(Pulsed orange, green, and red laser generations in an actively Q-switched Nd:YVO4 laser using cascaded electro-optic PPLN Q-switches)

相關論文

★ Continuous-wave narrow-line yellow laser generation in a diode-pumped Nd:YVO4 laser using volume Bragg gratings	★ 半導體雷射泵浦內建式Q-調制Nd:MgO:PPLN雷射之研究
★ 主動式多通道窄頻寬通Ti:PPLN波導濾波及模態轉換器之研究	★ 以鎂掺雜鈮酸鋰製作二倍頻藍光雷射波導元件之製程研究
★ 非週期性晶格極化反轉鈮酸鋰作為主動式窄頻寬通多波長濾波器及倍頻多波長濾波器	★ 非週期性晶格極化反轉鈮酸鋰作為有效率的二倍頻和模態轉換器之研究
★ 積體式週期與非週期極性反轉鈮酸鋰光電與雷射元件	★ 退火式質子交換波導PPLN電光調制TM模態轉輻射偏振態之研究
★ 高效率雙Nd:YVO4 雷射和頻黃光產生系統	★ 以單塊二維週期性晶格極化反轉鈮酸鋰同時作為Nd:YVO4雷射之電光Q調制器和腔內光參量振盪器
★ 綠光準相位匹配二倍頻質子交換鎂摻雜鈮酸鋰波導的製程研究	★ 以單晶片串級式週期性準相位匹配波長轉換器與非週期性準相位匹配電光偏振模態轉換器達成主動式調制窄頻輸出光參量振盪器之研究
★ 單片非週期性晶疇極化反轉鈮酸鋰同時作為Nd:YVO4雷射Q-調制和腔內光參量產生之研究	★ 準相位匹配二倍頻軟質子交換鎂摻雜鈮酸鋰波導研究
★ 以雙體積全像布拉格光柵及二維週期性晶疇極化反轉鈮酸鋰於Nd:YVO4雷射內達成脈衝式窄頻光參量振盪器之研究	★ 以非週期性晶疇極化反轉鈮酸鋰晶體作為電光波長調變光參量產生器

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摘要(中)

利用摻雜釹的固態雷射以腔內倍頻的方法可以有效的得到藍、綠和紅光。但
光譜在550 到650-nm 之黃橘光雷射卻相對稀少且低效率；而欲以倍頻方式產生
也因無相對之高效率紅外基頻雷射而不可得。因此利用對摻雜釹的固態雷射其兩
個重要的發射譜線4F3/2 – 4I11/2 (?~1.06 ?m) 及 4F3/2 - 4F13/2 (?~1.3 ?m)以腔內
或腔外和頻的方式產生黃橘光的雷射已成為重要的方法。黃橘光雷射源特別在生
物醫藥、光達、天文及軍事等應用上受到重視。而脈衝式黃橘光雷射更可因其高
重複率與高功率的特性而提供更廣大的應用。
本論文創新性提出以單塊串級式電光週期性晶格極化反轉鈮酸鋰
(periodically poled lithium niobate; PPLN)來分別Q-調制Nd:YVO4之1064-nm
與1342-nm 雷射譜線並同時調節該兩譜線之損益比例及Q-開關時間差以達成最
佳之雙波長脈衝及黃橘光和頻產生。此法將比傳統上使用單一Q-開關系統產生出
更高效率之脈衝黃橘光雷射源。在單塊晶體3-cm 的長度之下，當Q 調制訊號只
輸入任一Q-開關時，除了可得對應之共振雷射脈衝，還有藉由鈮酸鋰晶體非線性
性質產生非相位匹配產生的倍頻脈衝。在約五瓦特的泵浦下，1-kHz 的重複開關
頻率，可得1342-nm 最短脈寬26.96-ns 和尖峰功率14 千瓦特以及671-nm 最短
脈寬15.2-ns 和尖峰功率8.6 瓦特;抑或得到1064-nm 最短脈寬14.95-ns 和尖峰
功率18.5 千瓦特以及532-nm 最短脈寬9.26-ns 和尖峰功率20.6 瓦特。再利用BIBO 腔內和頻晶體在雙Q-開關之Q 調制訊號延遲25-ns 時，得到和頻593-nm 最
短脈寬5.83-ns 和尖峰功率140 瓦特。

摘要(英)

Intracavity frequency doubling in an Nd-laser system has become one
of the most efficient methods of producing blue, green, and red coherent
lights. However, no practical laser sources yet currently available in
the yellow-orange (570-620-nm) spectral region, nor applicable
fundamental infrared lasers for performing efficient frequency doubling
to the region. Sum frequency generation (SFG) of two emission lines from
transitions 4F3/2 – 4I11/2 (?1~1.06 ?m) and 4F3/2 - 4F13/2 (?2~1.3 ?m) of Nd-lasers
has become an important approach of generating coherent radiation in the
yellow-orange spectral region. Compact, high-repetition-rate pulsed
visible coherent light sources are attractive for many applications such
as bio-medicine, remote-sensing, astronomy, and military.
We achieved in a collinear three-mirror dual-wavelength Nd:YVO4 laser
system using two monolithically cascade electro-optic (EO) periodically
poled lithium niobate (PPLN) Q-switches to separately control the
Q-switching operation of the two wavelengths to optimize the temporal
overlap between them for efficient pulsed intracavity sum-frequency
generation. With this novel system, we can generate 5 high peak-power and high repetition-rate lasers radiating at Nd:YVO4 1064- and 1342-nm lines
and their non-phase-matched SHG 532- and 671-nm light and their
phase-matched SFG 593-nm light via the manipulation of the Q-switching
operations of the 3-cm bulk EO PPLN Q switches. We found a pulse build-up
delay time of ~25 ns between the two pump wavelengths is required for
achieving the best SFG efficiency in our system. When the system is
operated at a repetition rate of 1 kHz and a pump power of ~5W, we obtained
pulsed orange (593 nm), green (532 nm), and red (671 nm) generations with
peak powers of 140, 20.6, and 8.6 W, respectively.

關鍵字(中)

★ Q調制
★ 鈮酸鋰
★ 電光
★ 週期性晶格極化反轉

關鍵字(英)

★ Q-switch
★ PPLN
★ EO
★ Nd:YVO4

論文目次

第一章緒論...........................................1
1.1發展與歷史.........................................1
1.2鈮酸鋰晶體.........................................2
1.3雷射增益介質-Nd:YVO4...............................4
1.4研究動機......................................... 5
1.5概述索爾克濾波器來製作電光調制機制.................10
1.6利用摻雜Nd3+的机才製作整合性雷射原件..............11
1.7內容概要..........................................14
第二章理論..........................................15
2.1電光效應...........................................15
2.1.1利用電光效應製作索爾克濾波器.....................15
2.1.2在具有電光係數的鈮酸鋰晶體上製作索爾克濾波器.....21
2.2共振腔品質係數調制.................................24
2.3利用二階非線性細數達成和頻機制.....................33
2.3.1利用BIBO達成和頻的機制...........................35
2.3.2Q-switch下和頻的機制.............................38
第三章製程與架構.....................................42
3.1電光晶體的設計.....................................42
3.2電光晶體的製備.....................................42
第四章實驗量測與結果分析.............................46
4.1實驗架構...........................................47
4.2實驗結果...........................................50
4.3結果分析...........................................62
第五章結論與未來展望.................................63
5.1結論...............................................63
5.2未來展望...........................................64
第六章參考文獻.......................................68

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指導教授

陳彥宏(Yen-Hung Chen)

審核日期

2009-7-29

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