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Related Experiment Video

Updated: May 29, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

Rapidly frequency-swept optical beat source for continuous wave terahertz generation.

Min Yong Jeon1, Namje Kim, Sang-Pil Han

  • 1Department of Physics, Chungnam National University, Daejeon, South Korea. myjeon@cnu.ac.kr

Optics Express
|September 22, 2011
PubMed
Summary

A novel optical beat source enables rapid frequency sweeping for continuous wave (CW) terahertz (THz) generation. This tunable THz source is feasible for high-speed applications up to 1.0 THz.

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Area of Science:

  • Optoelectronics
  • Terahertz (THz) Photonics
  • Laser Spectroscopy

Background:

  • Continuous wave (CW) terahertz (THz) radiation is crucial for various applications, including spectroscopy and imaging.
  • Generating tunable and rapidly swept THz sources remains a significant challenge in photonics.

Purpose of the Study:

  • To propose and demonstrate a rapidly frequency-swept optical beat source for efficient CW THz generation.
  • To confirm the feasibility of this source for tunable THz radiation.

Main Methods:

  • Utilizing a wavelength-swept laser and a fixed distributed feedback (DFB) laser to create an optical beat signal.
  • Employing a fiber-coupled CW THz measurement system to detect and analyze the generated THz signals.
  • Characterizing the side mode suppression ratio (SMSR) across the sweeping bandwidth.

Main Results:

  • Achieved a sweeping bandwidth of approximately 17.3 nm (2.16 THz) between 1541.42-1558.72 nm.
  • Maintained a side mode suppression ratio (SMSR) greater than 45 dB for both wavelengths within the full sweeping range.
  • Observed CW THz signals, confirming the source's feasibility, with output falling to noise levels beyond 1.0 THz using a low-temperature grown (LTG) InGaAs photomixer.

Conclusions:

  • The proposed rapidly frequency-swept optical beat source is a viable method for generating tunable CW THz radiation.
  • This technology holds promise for high-speed tunable THz applications.
  • Further optimization may extend the usable THz frequency range.