基于LED泵浦的掺钕聚合物光波导放大器性能研究  

Optical Properties of Neodymium-Doped Polymer Optical Waveguides Based on Light-Emitting Diode Pumping

作　　者：杨星辰 周兆琴 满意 许辉[2] 张丹 Yang Xingchen;Zhou Zhaoqin;Man Yi;Xu Hui;Zhang Dan(School of Electronic Science and Engineering(National Model Microelectronics College),Xiamen University,Xiamen 361005,Fujian,China;Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education,School of Chemistry,Chemical Engineering and Materials,Heilongjiang University,Harbin 150080,Heilongjiang,China)

机构地区：[1]厦门大学电子科学与技术学院(国家示范性微电子学院),福建厦门361005 [2]黑龙江大学化学化工与材料学院功能无机材料化学教育部重点实验室,黑龙江哈尔滨150080

出　　处：《中国激光》2023年第6期8-14,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(61875170,61107023);国家重点研发计划(2021YFB2800500);厦门大学校长基金(20720150086)。

摘　　要：以双齿膦氧化合物4,6-二(二苯基氧膦基)二苯并噻吩(DBTDPO)为中性配体,以噻吩基三氟甲基乙酰丙酮(TTA)为阴离子配体,制备了具有分子内能量传递作用的稀土钕配合物Nd(TTA)3DBTDPO掺杂聚甲基丙烯酸甲酯(PMMA)溶液聚合物材料。采用Ag+-K+离子交换法和一步光刻法,分别制备了基于倏逝波型的BK-7玻璃波导和SU-8聚合物波导。采用成本低廉的发光二极管(LED)替代半导体激光器作为泵浦源,利用有机配体与中心稀土Nd^(3+)离子的分子内能量传递作用,在225 mW 405 nm LED泵浦下,在1.06μm波长处分别获得了3.6 dB/cm和4.1 dB/cm的光增益。所提出的基于分子内能量传递作用的LED垂直顶泵浦方式能够有效降低器件的商用化成本,有望在平面光子集成领域得到广泛应用。Objective Rare-earth-doped optical waveguide amplifiers(RDWAs)have been widely investigated over the past few years because of their low cost,compensation for optical loss,compatibility with silicon substrates,and potential applications in integrated optical systems.Among the rare-earth elements,neodymium has received significant attention because it can achieve optical amplification at 1.06µm.808 nm semiconductor lasers are often selected according to the intrinsic absorption of Nd^(3+)ions from ^(4)I9/2 state to 4F5/2 state to achieve the population inversion of Nd^(3+)ions.However,semiconductor lasers with a high pump power(100-400 mW)cause thermal damage to the waveguides and induce the up-conversion parasitic effect.Moreover,it is difficult to reduce their commercial costs.Therefore,three low-cost light-emitting diodes(LEDs)with different central wavelengths are selected as pump sources to achieve optical gains in neodymium-complex-doped polymer waveguides.Methods Using thermal ion exchange technology,a group of Ag+-K+ion-exchanged glass waveguides is fabricated in a BK-7 optical glass.A group of rectangular SU-8 polymer waveguides with a cross-section of 8μm×5μm is fabricated by a one-step lithography process.Next,an active polymer material,neodymium complex Nd(TTA)3DBTDPO-doped PMMA polymer,is spin-coated as the top cladding on the surfaces of the two types of waveguides.The room-temperature absorption and photoluminescence(PL)spectra of Nd(TTA)3DBTDPO-doped PMMA polymer films are measured.Under the excitation of three blue-violet LEDs with different central wavelengths,optical gains are achieved in waveguides based on evanescent-wave coupling.Results and Discussions For the evanescent-wave optical waveguide based on Ag+-K+ion-exchanged glass with a length of 10 mm,the output optical intensity increases with the increasing pump power when the input signal power is 0.03 mW at 1.06μm wavelength[Fig.5(a)].For a fixed signal power,the relative gain increases linearly with increasing pump power[Fig.5(b)].W

关 键 词：激光器 波导放大器 钕配合物 1.06μm 倏逝波 LED泵浦 

分 类 号：TN256[电子电信—物理电子学]