Continuous fine-tunable terahertz radiation source based on L-band laser difference frequency
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摘要:
本文提出了基于L波段激光差频的连续精调谐太赫兹辐射源，频率调谐范围为0.1~2.7 THz，调谐精度为1 GHz。设计了一种全保偏光纤链路，包括保偏隔离器、保偏耦合器和保偏掺铒光纤放大器，以保持两束光之间的偏振态一致。利用L波段双激光差频激发InGaAs高性能光电导天线，在
1568.8 ~1589.6 nm波长范围内产生0.1~2.7 THz连续太赫兹辐射。并使用高莱盒探测器和太赫兹扫描法布里-珀罗干涉仪对太赫兹波分别进行功率及频率测试。结果表明，太赫兹波在25分钟内的功率不稳定度在4%以内， 0.5 THz、1 THz处的频率测量结果与L波段双激光的间隔频率高度一致。此外，在0.9~1 THz范围内，实现了1 GHz的高精度调谐，对应0.008 nm的波长间隔。该连续精调谐太赫兹辐射源在高精度光谱检测等领域具有较高的应用潜力。Abstract:This paper presents a continuously fine-tunable terahertz radiation source based on L-band laser difference frequency generation, with a frequency tuning range of 0.1 to 2.7 THz and a tuning accuracy of 1 GHz. A fully polarization-maintaining fiber link, including polarization-maintaining isolators, polarization-maintaining couplers, and polarization-maintaining erbium-doped fiber amplifiers, was designed to keep the polarization states of the two beams consistent. By using the difference frequency of L-band dual lasers to excite the InGaAs high-performance photoconductive antenna, continuous terahertz radiation ranging from 0.1 to 2.7 THz was generated within the wavelength range of
1568.8 to1589.6 nm. The power and frequency of the terahertz waves were respectively tested using a Golay cell detector and a terahertz scanning Fabry-Perot interferometer. The results show that the power instability of the terahertz wave within 25 minutes is within 4%, and the frequency measurement results at 0.5 THz and 1 THz are highly consistent with the frequency interval of the L-band dual lasers. Additionally, within the range of 0.9 to 1 THz, a high-precision tuning of 1 GHz was achieved, corresponding to a wavelength interval of 0.008 nm. This continuously fine-tunable terahertz radiation source has high application potential in high-precision spectral detection and other fields. -
图 2 连续太赫兹辐射源结构示意图。PM：保偏；ISO：隔离器；EDFA：掺铒光纤放大器；OC：耦合器；OSA：光谱分析仪；VS：电压源；TPX：太赫兹透镜；F-P：太赫兹扫描法布里-珀罗干涉仪
Figure 2. Structural diagram of continuous THz radiation source. PM: Polarization-maintaining; ISO: Isolator; EDFA: Erbium-doped fiber amplifier; OC: Optical Coupler; OSA: Optical spectrum analyzer; VS: Voltage source; TPX: Terahertz lens; F-P: Terahertz scanning Fabry-Perot interferometer
图 3 连续太赫兹辐射源系统调谐输出特性
Figure 3. Tuning output characteristics of continuous terahertz radiation sources
图 4 输出频率0.5 THz、1 THz、1.5 THz时太赫兹波稳定性
Figure 4. Terahertz wave stability at output frequencies of 0.5 THz, 1 THz, and 1.5 THz
图 5 0.5 THz、1 THz、1.5 THz双波长差频信号测试结果图(a)-(c)
Figure 5. Test results graph of dual-wavelength difference frequency signals at 0.5 THz, 1 THz, and 1.5 THz (a)-(c)
图 6 0.5 THz、1 THz、1.5 THz时信噪比测量结果(a)-(c)
Figure 6. Measurement results of signal-to-noise ratio at 0.5 THz, 1 THz, and 1.5 THz (a)-(c)
图 7 太赫兹输出强度与双波长激光泵浦总功率关系图
Figure 7. Relationship between Terahertz Output Intensity and Total Power of Dual-Wavelength Laser Pumping
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[1] PREU S, DÖHLER G H, MALZER S, et al. Tunable, continuous-wave Terahertz photomixer sources and applications[J]. Journal of Applied Physics, 2011, 109(6): 061301. doi: 10.1063/1.3552291 [2] VAN DIJK F, KERVELLA G, LAMPONI M, et al. Integrated InP heterodyne millimeter wave transmitter[J]. IEEE Photonics Technology Letters, 2014, 26(10): 965-968. doi: 10.1109/LPT.2014.2309353 [3] LEE E S, MOON K, LEE I M, et al. Semiconductor-based terahertz photonics for industrial applications[J]. Journal of Lightwave Technology, 2018, 36(2): 274-283. doi: 10.1109/JLT.2017.2786260 [4] KOHLHAAS R B, BREUER S, NELLEN S, et al. Photoconductive terahertz detectors with 105 dB peak dynamic range made of rhodium doped InGaAs[J]. Applied Physics Letters, 2019, 114(22): 221103. doi: 10.1063/1.5095714 [5] KOHLHAAS R B, GLOBISCH B, NELLEN S, et al. Rhodium doped InGaAs: a superior ultrafast photoconductor[J]. Applied Physics Letters, 2018, 112(10): 102101. doi: 10.1063/1.5016282 [6] JIANG X H, LI Y H, LI Y ZH, et al. Detection and imaging of chemicals and hidden explosives using terahertz time-domain spectroscopy and deep learning[J]. Light: Science & Applications, 2026, 15(1): 80. [7] 刘毅, 江恺, 房新岳, 等. 基于宇称时间对称与饱和吸收效应的宽可调谐高光信噪比布里渊光纤激光器(英文)[J]. 中国光学(中英文), 2024, 17(5): 1244-1253.LIU Y, JIANG K, FANG X Y, et al. Widely-wavelength-tunable Brillouin fiber laser with improved optical signal-to-noise ratio based on parity-time symmetric and saturable absorption effect[J]. Chinese Optics, 2024, 17(5): 1244-1253. (查阅网上资料, 本条文献为英文文献, 请确认). [8] 申彦春, 徐雅倩, 胡伟. 可调谐太赫兹液晶超表面[J]. 液晶与显示, 2025, 40(3): 407-423. doi: 10.37188/CJLCD.2024-0320SHEN Y CH, XU Y Q, HU W. Overview of active terahertz metasurface devices based on liquid crystal[J]. Chinese Journal of Liquid Crystals and Displays, 2025, 40(3): 407-423. (in Chinese). doi: 10.37188/CJLCD.2024-0320 [9] NAFTALY M, VIEWEG N, DENINGER A. Industrial applications of terahertz sensing: state of play[J]. Sensors, 2019, 19(19): 4203. doi: 10.3390/s19194203 [10] NANDI U, NORMAN J C, GOSSARD A C, et al. 1550-nm driven ErAs: In(Al)GaAs photoconductor-based terahertz time domain system with 6.5 THz bandwidth[J]. Journal of Infrared, Millimeter, and Terahertz Waves, 2018, 39(4): 340-348. doi: 10.1007/s10762-018-0471-9 [11] DENINGER A J, ROGGENBUCK A, SCHINDLER S, et al. 2.75 THz tuning with a triple-DFB laser system at 1550 nm and InGaAs photomixers[J]. Journal of Infrared, Millimeter, and Terahertz Waves, 2015, 36(3): 269-277. doi: 10.1007/s10762-014-0125-5 [12] BURFORD N M, EL-SHENAWEE M O. Review of terahertz photoconductive antenna technology[J]. Optical Engineering, 2017, 56(1): 010901. doi: 10.1117/1.OE.56.1.010901 [13] LIEBERMEISTER L, NELLEN S, KOHLHAAS R B, et al. Optoelectronic frequency-modulated continuous-wave terahertz spectroscopy with 4 THz bandwidth[J]. Nature Communications, 2021, 12(1): 1071. doi: 10.1038/s41467-021-21260-x [14] NELLEN S, ISHIBASHI T, DENINGER A, et al. Experimental comparison of UTC- and PIN-photodiodes for continuous-wave terahertz generation[J]. Journal of Infrared, Millimeter, and Terahertz Waves, 2020, 41(4): 343-354. doi: 10.1007/s10762-019-00638-5 [15] NELLEN S, LAUCK S, SCHWANKE G, et al. Radiation pattern of planar optoelectronic antennas for broadband continuous-wave terahertz emission[J]. Optics Express, 2021, 29(6): 8244-8257. doi: 10.1364/OE.416844 [16] TURAN D, YARDIMCI N T, JARRAHI M. Plasmonics-enhanced photoconductive terahertz detector pumped by Ytterbium-doped fiber laser[J]. Optics Express, 2020, 28(3): 3835-3845. doi: 10.1364/OE.386368 [17] YARDIMCI N T, CAKMAKYAPAN S, HEMMATI S, et al. A high-power broadband terahertz source enabled by three-dimensional light confinement in a plasmonic nanocavity[J]. Scientific Reports, 2017, 7(1): 4166. doi: 10.1038/s41598-017-04553-4 [18] LU P K, JIANG X H, ZHAO Y F, et al. Bias-free terahertz generation from a silicon-compatible photoconductive emitter operating at telecommunication wavelengths[J]. Applied Physics Letters, 2022, 120(26): 261107. doi: 10.1063/5.0098340 [19] YARDIMCI N T, JARRAHI M. Nanostructure-enhanced photoconductive terahertz emission and detection[J]. Small, 2018, 14(44): 1802437. [20] BERRY C W, HASHEMI M R, PREU S, et al. High power terahertz generation using 1550 nm plasmonic photomixers[J]. Applied Physics Letters, 2014, 105(1): 011121. doi: 10.1063/1.4890102 [21] PARK S G, CHOI Y, OH Y J, et al. Terahertz photoconductive antenna with metal nanoislands[J]. Optics Express, 2012, 20(23): 25530-25535. doi: 10.1364/OE.20.025530 [22] GLOBISCH B, DIETZ R J B, KOHLHAAS R B, et al. Iron doped InGaAs: competitive THz emitters and detectors fabricated from the same photoconductor[J]. Journal of Applied Physics, 2017, 121(5): 053102. doi: 10.1063/1.4975039 [23] LIEBERMEISTER L, NELLEN S, KOHLHAAS R, et al. Ultra-fast, high-bandwidth coherent cw THz spectrometer for non-destructive testing[J]. Journal of Infrared, Millimeter, and Terahertz Waves, 2019, 40(3): 288-296. doi: 10.1007/s10762-018-0563-6 [24] YARDIMCI N T, YANG SH H, BERRY C W, et al. High-power terahertz generation using large-area plasmonic photoconductive emitters[J]. IEEE Transactions on Terahertz Science and Technology, 2015, 5(2): 223-229. doi: 10.1109/TTHZ.2015.2395417 [25] KUTZ J, LIEBERMEISTER L, VIEWEG N, et al. A terahertz fast-sweep optoelectronic frequency-domain spectrometer: calibration, performance tests, and comparison with TDS and FDS[J]. Applied Sciences, 2022, 12(16): 8257. doi: 10.3390/app12168257 [26] LIEBERMEISTER L, NELLEN S, KOHLHAAS R B, et al. Optoelectronic frequency-modulated continuous-wave terahertz spectroscopy with 4 THz bandwidth[J]. Nature Communications, 2021, 12(1): 1071. (查阅网上资料, 本条文献与第13条文献重复, 请确认). [27] AHMADIVAND A, GERISLIOGLU B, AHUJA R, et al. Terahertz plasmonics: the rise of toroidal metadevices towards immunobiosensings[J]. Materials Today, 2020, 32: 108-130. doi: 10.1016/j.mattod.2019.08.002 [28] KUTZ J, LIEBERMEISTER L, VIEWEG N, et al. A terahertz fast-sweep optoelectronic frequency-domain spectrometer: calibration, performance tests, and comparison with TDS and FDS[J]. Applied Sciences, 2022, 12(16): 8257. (查阅网上资料, 本条文献与第25条文献重复, 请确认). [29] TURAN D, LU P K, YARDIMCI N T, et al. Wavelength conversion through plasmon-coupled surface states[J]. Nature Communications, 2021, 12(1): 4641. doi: 10.1038/s41467-021-24957-1 -
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