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Gapless tunable intense terahertz pulse generation in strained diamond.

Yudan Su^1,2,3, Yuxuan Wei¹, Chaonan Lin^4,5

¹Department of Physics, State Key Laboratory of Surface Physics and Key Laboratory of Micro- and Nano-Photonic Structure (MOE), Fudan University, Shanghai, 200433, China.

Light, Science & Applications

|March 31, 2026

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We achieved intense, high-quality femtosecond terahertz (THz) pulses using collinear phase matching in strained diamond. This method generates a wide, gapless frequency band from 5 to over 15 THz.

Area of Science:

Optics and Photonics
Condensed Matter Physics
Quantum Electronics

Background:

Coherent Stokes Raman Scattering (CSRS) is a powerful technique for nonlinear spectroscopy.
Generating tunable, high-intensity terahertz (THz) radiation remains a significant challenge in ultrafast science.
Diamond is a promising material for nonlinear optical applications due to its high thermal conductivity and nonlinear response.

Purpose of the Study:

To demonstrate collinear phase matching of transient CSRS in strained diamond.
To enable the generation of intense, high-quality, femtosecond THz pulses.
To achieve a gapless frequency band coverage for THz generation.

Main Methods:

Utilized transient coherent Stokes Raman scattering (CSRS) in strained diamond.

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Last Updated: Apr 2, 2026

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Employed collinear phase matching to optimize THz pulse generation.

Performed experimental measurements and theoretical calculations to validate the mechanism.

Main Results:

Successfully generated intense, high-quality, femtosecond THz pulses.
Achieved a gapless frequency band from 5 to beyond 15 THz.
Experimental results were in excellent agreement with theoretical predictions.

Conclusions:

Collinear phase matching in strained diamond is an effective method for generating broadband THz pulses.
The theoretical model provides guidance for optimizing THz output by adjusting input pulse parameters.
This technique offers a promising route for advanced THz spectroscopy and applications.