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Monolithic dual-mode distributed feedback semiconductor laser for tunable continuous-wave terahertz generation.

Namje Kim¹, Jaeheon Shin, Eundeok Sim

¹Photonic/Wireless Convergence Components Department, ETRI, Daejeon 305-700, Korea.

|August 6, 2009

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We developed a compact dual-mode semiconductor laser for generating tunable terahertz (THz) waves. This novel optical beat source enables continuous tuning of continuous-wave (CW) THz emission.

Area of Science:

Optoelectronics
Terahertz (THz) Science and Technology
Semiconductor Lasers

Background:

Continuous-wave (CW) terahertz (THz) generation is crucial for various applications.
Compact and tunable THz sources are highly desirable.
Existing THz generation methods often face limitations in tunability and size.

Purpose of the Study:

To demonstrate a monolithic dual-mode semiconductor laser as a compact optical beat source.
To achieve tunable continuous-wave (CW) terahertz (THz) generation.
To enable independent tuning of laser modes for precise THz frequency control.

Main Methods:

Fabrication of a monolithic dual-mode semiconductor laser with two distributed feedback (DFB) sections and a phase section.
Independent tuning of each DFB laser mode using integrated micro-heaters and current adjustments.

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Utilizing the dual-mode laser as an excitation source for Fe(+)-implanted InGaAs photomixers.

Main Results:

Successful generation of tunable CW THz radiation.
Continuous tuning of THz frequency from 0.17 to 0.49 THz.
Demonstration of independent wavelength control for each laser mode.

Conclusions:

The monolithic dual-mode semiconductor laser is an effective compact optical beat source for tunable CW THz generation.
The developed laser enables precise control over THz emission frequency.
This technology offers a promising solution for compact and tunable THz systems.