研究目的
Investigating the effective generation of terahertz radiation via optical rectification of femtosecond laser pulses in a system of a nonlinear-optical crystal partially filling the cross section of a rectangular metal waveguide.
研究成果
The study demonstrates that a waveguide partially filled with a nonlinear crystal can efficiently generate THz radiation due to a double effect of ensuring phase matching and reducing THz wave absorption. This approach can be used for creating effective THz broadband active waveguide systems or frequency scanning antennas.
研究不足
The study is limited by the absorption of THz radiation in the system and the need for precise phase-matching conditions to achieve high conversion efficiency.
1：Experimental Design and Method Selection:
The study involves numerical calculations for phase-matching in various nonlinear optical crystals (LiNbO3, ZnTe, DAST, GaSe) and investigates the influence of THz radiation absorption on the efficiency of coherent THz radiation generation.
2：Sample Selection and Data Sources:
The study focuses on LiNbO3, ZnTe, DAST, and GaSe crystals due to their high figures of merit (FOMs).
3：List of Experimental Equipment and Materials:
A Ti-Sapphire laser for optical excitation, nonlinear crystals (LiNbO3, ZnTe, DAST, GaSe), and a rectangular metal waveguide.
4：Experimental Procedures and Operational Workflow:
The crystal was mounted in a free space and in a waveguide to study the phase-matching condition and the effect of THz radiation absorption.
5：Data Analysis Methods:
The experimental spectra of the THz pulses were obtained after fast Fourier transform of the time-domain THz waveform.
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