2.75 THz tuning with a triple-DFB laser system at 1550 nm and InGaAs photomixers

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• 作者：Anselm J. Deninger ; A. Roggenbuck…
• 关键词：Terahertz spectroscopy ; Frequency domain ; Distributed feedback lasers ; InGaAs photomixers ; Optoelectronics
• 刊名：International Journal of Infrared and Millimeter Waves
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：36
• 期：3
• 页码：269-277
• 全文大小：525 KB
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• 作者单位：Anselm J. Deninger (1)
  A. Roggenbuck (1)
  S. Schindler (1)
  S. Preu (2)
  
  1. TOPTICA Photonics AG, Lochhamer Schlag 19, 82166, Gr?felfing, Germany
  2. Department of Electrical Engineering and Information Technology, Technische Universit?t Darmstadt, Merckstra?e 25, 64283, Darmstadt, Germany
  
• 刊物类别：Physics and Astronomy
• 刊物主题：None Assigned
• 出版者：Springer New York
• ISSN：1866-6906

文摘

To date, exploiting the full bandwidth of state-of-the-art InGaAs photomixers for generation and detection of continuous-wave (CW) THz radiation (typ. ~50 GHz to ~3 THz) required complex and costly external-cavity diode lasers with motorized resonator control. Distributed feedback (DFB) lasers, by contrast, are compact and inexpensive, but the tuning range per diode is limited to ~600 GHz at 1.5 μm. In this paper, we show that a combination of three DFB diodes covers the complete frequency range from 0 -2750 GHz without any gaps. In combination with InGaAs-based photomixers for terahertz generation and detection, the system achieves a dynamic range of > 100 dB at 56 GHz, 64 dB at 1000 GHz, and 26 dB at 2500 GHz. A field-programmable gate array (FPGA)-based lock-in amplifier permits a flexible adjustment of the integration time from 0.5 ms to 600 ms. Employing an optimized “fast scan-mode, a spectrum of ~1200 GHz -the bandwidth of each subset of two lasers -and 40 MHz steps is acquired in less than one minute, still maintaining a reasonable dynamic range. To the best of our knowledge, the bandwidth of 2.75 THz presents a new record for DFB-based CW-terahertz systems.