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首页> 外文会议>Terahertz, RF, millimeter, and submillimeter-wave technology and applications VI >A Tunable Continuous-wave Terahertz Generator based on 1.3 μm Dual-mode Laser Diode and Travelling-wave Photodiode
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A Tunable Continuous-wave Terahertz Generator based on 1.3 μm Dual-mode Laser Diode and Travelling-wave Photodiode

机译：基于1.3μm双模激光二极管和行波光电二极管的可调连续波太赫兹发生器

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摘要

We demonstrate the tunable continuous-wave (CW) terahertz generator based on the λ/4 phase-shifted 1.3 μm dual-mode laser diode (DML) and travelling-wave photodiode (TWPD). The DML and TWPD operate as an optical beat source and terahertz photomixer, respectively. The laser diodes (LDs) operating at the 1.3 μm have more suitable characteristics as optical beat sources than the LDs operating at 1.55 μm because of their high efficiency and better thermal stability. The micro-heaters are integrated on top of each DFB LD for mode beat frequency tuning. The fabricated DML was continuously tuned from 230 GHz to 1485 GHz by increasing the temperature of each DFB section independently via integrated micro-heaters. The high-speed TWPD with an InGaAs absorber was designed and fabricated to efficiently generate the photomixing terahertz CW. A complementary log-periodic antenna was integrated with the TWPD to radiate the generated terahertz wave with minimum reflection in the wide frequency range. The terahertz characteristics of the tunable CW terahertz generator based on the DML and TWPD were measured in a fiber-coupled, homodyne terahertz photomixing system. Our results of the tunable CW terahertz generator show the feasibility of a compact and highly efficient CW terahertz spectrometer and imager.
机译：我们演示了基于λ/ 4相移的1.3μm双模激光二极管（DML）和行波光电二极管（TWPD）的可调连续波（CW）太赫兹发生器。 DML和TWPD分别用作光学拍频源和太赫兹光混频器。在1.3μm下工作的激光二极管（LD）比在1.55μm下工作的LD具有更适合的特性作为光拍源，因为它们具有高效率和更好的热稳定性。微型加热器集成在每个DFB LD的顶部，用于模式拍频调谐。通过集成微型加热器独立增加每个DFB部分的温度，可将制造的DML连续从230 GHz调谐到1485 GHz。设计并制造了带有InGaAs吸收剂的高速TWPD，以有效地产生光混合太赫兹CW。互补对数周期天线与TWPD集成在一起，以辐射所产生的太赫兹波，在宽频率范围内反射最小。在光纤耦合的零差太赫兹光混频系统中测量了基于DML和TWPD的可调CW太赫兹发生器的太赫兹特性。我们的可调谐CW太赫兹发生器的结果表明了紧凑高效的CW太赫兹光谱仪和成像仪的可行性。

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