以週期性雙稜鏡型晶疇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

Double-prism domain PPLN for simultaneous laser Q-switching and optical parametric oscillation in a Nd:YVO4 Laser

黃錦峯(Jin-feng Huang)

指導教授 ： 陳彥宏

國立中央大學/理學院/光電科學與工程學系/碩士(2013年)

摘要

在本論文中，致力於把兩種功能的元件整合在同一塊晶體上。此兩種元件分別為電光光束偏折器元件及光參量產生器與光參量振盪器，在本實驗中已成功製作出雙稜鏡 (double-prism domain ，DPD)週期性晶格極化反轉鈮酸鋰晶體，更進一步，將此晶體置入Nd:YVO4雷射系統中，同時達成電光Q調制開關及光參量產生器與光參量振盪器。

此雙稜鏡 (double-prism domain ，DPD)週期性晶格極化反轉鈮酸鋰晶體週期為30μm，可當作光束偏折器與光參量產生器使用，在光束偏折器方面，當施加電壓約為300V時可將光束偏折1度，而放入雷射共振腔後，藉由外加180V的強度、頻率為1k赫茲的脈衝電壓於晶體後達成電光Q調制開關，並在雷射二極體泵浦功率為7.5W時量測波長1550nm的光參量振盪器訊號光，可得到脈衝能量為8.14uJ、脈衝寬度為3.5ns (尖峰功率為2.3kW)，且可達成光參量振盪器連續波長調變。

關鍵字

週期性雙稜鏡型晶疇極化反轉鈮酸鋰 ； Nd:YVO4雷射 ； Q-調制 ； 光參量振盪器

並列摘要

In this thesis, we have devoted to integrate two device functions in a monolithic LiNbO3 crystal. These two devices are an EO beam deflector and an optical parametric generator (OPG) or optical parametric oscillator (OPO). The PPLN crystal has a double-prism domain (DPD) structure has been designed and fabricated in this work. We further inserted this DPD PPLN crystal in a Nd:YVO4 laser system to simultaneously function as a laser Q switch and an intracavity optical parametric generator (OPG) and optical parametric oscillator (OPO).

The PPLN crystal has a double-prism domain (DPD) structure with a domain period of 30 m to simultaneously as an electro-optic (EO) beam deflector (and therefore an EO Q-switch in the laser cavity) and an optical parametric down converter. The characterized deflection angle of the DPD PPLN device was 1o at the voltage about 300V. And at 180V Q-switching voltage and 1-kHz switching rate, we measured a down-converted signal at 1550 nm with pulse energy of 8.14 J and pulse width of 3.5ns ( peak power of ~2.3 kW) from the constructed IOPO at 7.5W diode pump power. Continuous wavelength tuning of the IOPO signal was also demonstrated.

並列關鍵字

Double-prism domain PPLN ； Nd:YVO4 laser ； Q-switching ； OPO

參考文獻

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