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K Kawase¹, J Shikata, H Minamide

¹Photodynamics Research Center, RIKEN, 519-1399 Aramaki-Aoba, Sendai 980-0845, Japan. kodo@postman.riken.go.jp

|March 22, 2008

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A tunable coherent terahertz-wave source was developed using lithium niobate and a silicon prism coupler. This method enhances terahertz-wave coupling efficiency and reduces beam spread for improved performance.

Area of Science:

Optics and Photonics
Terahertz (THz) Science and Technology

Background:

Terahertz (THz) wave generation is crucial for various scientific and technological applications.
Efficiently coupling THz waves out of nonlinear crystals and managing beam characteristics are significant challenges.

Purpose of the Study:

To develop a widely tunable coherent THz-wave source operating between 1 and 3 THz.
To improve THz-wave coupling efficiency and reduce beam divergence using a novel Si-prism coupler.

Main Methods:

Utilizing room-temperature parametric oscillation in a LiNbO3 crystal pumped by a Q-switched Nd:YAG laser.
Employing a silicon (Si) prism coupler to overcome total internal reflection and extract the THz wave.
Introducing an arrayed Si-prism coupler to enhance coupling and decrease diffraction.

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Main Results:

Achieved a widely tunable coherent THz-wave source in the 1–3 THz range.
Demonstrated a sixfold increase in coupling efficiency with the arrayed Si-prism coupler compared to a single prism.
Observed a 40% decrease in the far-field beam diameter using the arrayed Si-prism coupler.

Conclusions:

The developed system provides an efficient and tunable source for THz-wave generation.
The arrayed Si-prism coupler significantly improves THz-wave extraction and beam quality.
Cavity rotation positively influences unidirectional THz radiation from the Si prism.