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Upconversion detection of terahertz wave with nanosecond pulse duration using continuous-wave laser
Naichang Liu1, Jiasheng Yuan2, Xingyu Zhang1,2
1School of Information Science and Engineering, Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao, 266237, China.
Scientific Reports
|June 1, 2026
Summary
This study shows effective terahertz (THz) wave detection using a continuous-wave (CW) laser and a DAST crystal. The method works for pulsed THz waves without needing temporal alignment, offering a flexible detection scheme.
Area of Science:
- Optics and Photonics
- Terahertz (THz) Science and Technology
- Nonlinear Optics
Background:
- Terahertz (THz) wave detection is crucial for various applications.
- Existing THz detection methods often require complex setups or specific conditions.
- Pulsed THz wave detection with continuous-wave (CW) lasers presents a challenge due to synchronization requirements.
Purpose of the Study:
- To demonstrate effective frequency up-conversion detection of pulsed THz waves using a CW laser.
- To investigate the influence of pump power and heat accumulation on THz up-conversion efficiency.
- To provide a simple and flexible scheme for THz wave detection.
Main Methods:
- Utilized a continuous-wave (CW) laser for frequency up-conversion.
- Employed a DAST (4-N,N-dimethylamino-4'-N'-methyl-stilbazolium tosylate) crystal for THz wave detection.
- Investigated pump-power dependence and compared crystals with different heat-dissipation capabilities.
Main Results:
- Achieved effective frequency up-conversion detection of nanosecond-duration pulsed THz waves.
- Demonstrated that up-conversion efficiency is dependent on pump power.
- Revealed the significant influence of heat accumulation on detection efficiency, especially in crystals with poor heat dissipation.
Conclusions:
- The developed method enables pulsed THz wave detection using a CW laser without temporal alignment or phase synchronization.
- This approach offers a simple, flexible, and efficient scheme for THz detection.
- Understanding heat accumulation effects is vital for optimizing THz up-conversion detection.
