差频法产生太赫兹抽运源的光子集成芯片
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摘要
为实现高效率、小型化、可调谐、室温下稳定运转的半导体太赫兹(THz)波源,提出了采用光子集成技术,将两个并联的分布反馈(DFB)激光器与无源多模干涉耦合器(MMI)集成,输出THz拍频抽运光束的方案。两DFB激光器的光栅布拉格波长设计偏调为4.8 nm(0.6 THz),通过改变集成器件中DFB激光器的注入电流进行波长调谐,每路DFB能够达到3.9 nm的波长偏调。将拍频光束通过单模光纤耦合到频域分辨光学门(FROG)中对THz拍频光束空间拍频包络进行测量,在不同的DFB区注入电流下,证实了集成芯片在0.184~1.02 THz频率调谐范围内可室温连续输出用于产生THz波的有效THz拍频光束。
To approach a high-efficiency, chip-size and widely tunable room temperature semiconductor terahertz(THz) frequency beating optical pumping beam source, an optical-integrated design is adopted. Two multipled distribute feedback(DFB) semiconductor lasers and a multimode interference(MMI) coupler are monolithically integrated on In P based substrate for terahertz frequency beating optical pumping beam generation. The designed Bragg wavelength spacing of the two DFBs is 4.8 nm(0.6 THz). The Bragg wavelength of the two DFBs can be tuned by the injected current. Each of them can red-shift by 3.9 nm. The output THz beating optical beam of the opticalintegrated chip can be coupled into the frequency resolved optical gate(FROG) through single mode fiber. By changing the injected current of the DFBs, room temperature THz frequency beating optical pumping beam source with a tunable frequency range of 0.184~1.02 THz is demonstrated.
To approach a high-efficiency, chip-size and widely tunable room temperature semiconductor terahertz(THz) frequency beating optical pumping beam source, an optical-integrated design is adopted. Two multipled distribute feedback(DFB) semiconductor lasers and a multimode interference(MMI) coupler are monolithically integrated on In P based substrate for terahertz frequency beating optical pumping beam generation. The designed Bragg wavelength spacing of the two DFBs is 4.8 nm(0.6 THz). The Bragg wavelength of the two DFBs can be tuned by the injected current. Each of them can red-shift by 3.9 nm. The output THz beating optical beam of the opticalintegrated chip can be coupled into the frequency resolved optical gate(FROG) through single mode fiber. By changing the injected current of the DFBs, room temperature THz frequency beating optical pumping beam source with a tunable frequency range of 0.184~1.02 THz is demonstrated.
引文
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12 Qin Xuefei.The Investigation of Mid-Infrared Difference Frequency Laser Generation Based on PPLN Crystal[D].Jinhua:Zhejiang Norma University,2013:1-2.秦雪飞.基于PPLN晶体的中红外差频激光技术研究[D].金华:浙江师范大学,2013:1-2.
2 Zhiyong Tan,Li Gu,Tianhong Xu,et al..Real-time reflection imaging with terahertz camera and quantum-cascade laser[J].Chin Opt Lett,2014,12(7):070401.
3 Zheng Xianhua,Wang Xinke,Sun Wenfeng,et al..Developments and applications of the terahertz digital holography[J].Chinese J Lasers,2014,41(2):0209003.郑显华,王新柯,孙文峰,等.太赫兹数字全息术的研发与应用[J].中国激光,2014,41(2):0209003.
4 Li Qi,Hu Jiaqi,Li Yunda,et al..Autofocusing research on terahertz Gabor inline digital holography[J].Acta Optica Sinica,2014,34(s1):s111001.李琦,胡佳琦,李运达,等.太赫兹伽栢同轴数字全息自动聚焦研究[J].光学学报,2014,34(s1):s111001.
5 Qingzhao Wu,Li Gu,Zhiyong Tan,et al..Detection of a directly modulated terahertz light with quantum-well photodetector[J].Chin Opt Lett,2014,12(12):120401.
6 Zhang Jingshui,Zhu Weiwen,Zhao Yuejin,et al..Passive THz imaging system based on the crank-rocker mechanism[J].Acta Optica Sinica,2013,33(12):1211006.张镜水,朱维文,赵跃进,等.基于曲柄摇杆机构的被动太赫兹波成像系统[J].光学学报,2013,33(12):1211006.
7 Kim N,Han SP,Ko H,et al..Tunable CW THz generation detection with compact 1.55 mm detuned dual mode laser diode and In Ga As based photomixer[J].Opt Express,2011,19(16):15397-15403.
8 Lianping Hou,Mohsin Haji,Iain Eddie,et al..Laterally coupled dual-grating distributed feedback lasers for generating mode-beat terahertz signals[J].Opt Lett,2015,40(2):182-185.
9 Yang Qing,Huo Yujing,Duan Yusheng,et al..Double-longitudinal-mode continuous-wave laser with ultra-large frequency difference used for narrowband terahertz-wave generation[J].Acta Optica Sinica,2013,33(5):0514002.杨清,霍玉晶,段玉生,等.用于产生窄带太赫兹波的超大频差双纵模连续激光器[J].光学学报,2013,33(5):0514002.
10 Yating Zhou,Jie Hou,Xiangfei Chen,et al..Dual current injection tunable SBG semiconductor laser with asymmetricπequivalent phase shift[J].Microwave and Optical Technology Letters,2013,55(3):692–696.
11 Junqi Liu,Jianyan Chen,Tao Wang,et al..High efficiency and high power continuous-wave semiconductor terahertz lasers at 3.1 THz[J].Solid-State Electronics,2013,81:68-71.
12 Qin Xuefei.The Investigation of Mid-Infrared Difference Frequency Laser Generation Based on PPLN Crystal[D].Jinhua:Zhejiang Norma University,2013:1-2.秦雪飞.基于PPLN晶体的中红外差频激光技术研究[D].金华:浙江师范大学,2013:1-2.