以單塊二維週期、非週期性晶格極化反轉鎂摻雜鈮酸鋰同時作為Nd:YVO4雷射之電光布拉格Q調制器和腔內多波長光參量振盪器

Monolithic 2D periodically、aperiodically poled MgO:CLN as simultaneously an Electro-Optic Bragg Q-switch and a Multi-wavelength Optical Parametric Oscillator (OPO) in Nd:YVO4 laser

劉秉忠(Bing-Zhong Liu)

指導教授 ： 陳彥宏

國立中央大學/理學院/光電科學研究所/碩士(2011年)

摘要

具有可調變波長和高同調性的光參量振盪器在遙測、光譜學、非線性光學、測距儀、光通訊、生醫等，都有很廣泛的應用。
本篇論文致力於把兩種功能的元件整合在同一塊晶體上。此兩種元件分別為一電光布拉格繞射元件及光參量產生器與光參量振盪器。利用一二維週期性、非週期性晶格極化反轉鎂摻雜鈮酸鋰晶體來同時滿足驅動此二元件所需之相位匹配，並將它放置在一Nd:YVO4 雷射共振腔內同時作為雷射Q調制器及腔內多波長光參量產生器與光參量振盪器。
此晶體的y 軸方向符合1064nm 布拉格條件的週期性結構，其週期為20um，布拉格角度為0.7度。晶體的x 軸方向則利用模擬退火法設計符合多波長相位匹配條件，作為多波長光參量產生器。
當施加電壓為350V，脈衝頻率為1KHz 的電訊號，於此二維晶體的z方向時，在環境溫度為40 度，吸收功率為7.5W，可量測到1550nm波段的腔內光參量振盪器尖峰功率大於430W。

關鍵字

光參量振盪器 ； 鎂摻雜鈮酸鋰 ； 非週期性晶格極化反轉 ； 電光效應 ； 布拉格結構.共振腔品質因素

並列摘要

Optical parametric oscillators (OPOs) can produce wavelength tunable coherent light sources and have been widely used in
various applications including the remote sensing, spectroscopy, nonlinear optics, range finder, optical
communications, and bio-medicine.
In this thesis, we have devoted to integrate two device
functions in a monolithic MgO:LiNbO3 crystal. These two
devices are an EO Bragg deflector and an optical parametric
generator (OPG)& optical parametric oscillator (OPG). A 2D
periodically、aperiodically poled MgO dopant lithium niobate
crystal has been designed and fabricated in this work to
simultaneously satisfy the phase-matching conditions required for functioning the two devices. We further inserted this 2Dcrystal in a Nd:YVO4 laser system to simultaneously function as a laser Q switch and an intracavity optical parametric generator (OPG)& optical parametric oscillator (OPO).
The monolithic MgO:CLN has a periodic domain structure along
the crystallographic y axis of period 20 um to phase-match the 1064-nm Bragg diffraction process at Bragg angle ~0.7o. The crystal and has an aperiodiclly domain structure along the crystallographic x axis, designed by the SA method for multi-wavelength optical parametric generation.
When driving the 2D domain structured MgO:CLN with 350-V pulses at 1 KHz, we obtained 1550-nm signal from the IOPO system with a peak power of > 420W, at 7.5-W diode pump power at 40oC.

並列關鍵字

Bragg ； Electro-Optic ； aperiodically poled MgO:CLN ； Q-switch ； Optical Parametric Oscillator

參考文獻

[1.4]R.H.Kingston,"Parametric Amplification and Oscillation

[1.7]A.A.Ballman,"Growth of Piezoelectric and Ferroelectric

generations in an actively Q-switched Nb:YVO4 laser

and optical damage properties in ferroelectrics.

optically induced refractive index damage of lithium