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Distributed feedback laser diode integrated with distributed Bragg reflector for continuous-wave terahertz

Namje Kim¹, Sang-Pil Han, Han-Cheol Ryu

¹THz Photonics Creative Research Center, ETRI, Daejeon 305-700, South Korea.

|October 6, 2012

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This study demonstrates a widely tunable dual mode laser diode for generating terahertz (THz) radiation. The novel single cavity device achieves continuous wavelength tuning and THz wave generation up to 1.5 THz.

Area of Science:

Optoelectronics
Photonics
Semiconductor Devices

Background:

Tunable lasers are crucial for applications requiring variable wavelengths.
Generating continuous wave terahertz (THz) radiation efficiently remains a challenge.

Purpose of the Study:

To demonstrate a widely tunable dual mode laser diode with a single cavity structure.
To achieve continuous and independent wavelength tuning of dual modes.
To generate continuous wave THz radiation using the developed laser diode.

Main Methods:

Fabrication of a single cavity laser diode integrating distributed feedback (DFB) and distributed Bragg reflector (DBR) sections.
Integration of micro-heaters for independent wavelength tuning of each mode.
Utilizing a single gain medium to establish a common optical cavity and modes.

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Generation of THz radiation using low-temperature grown InGaAs photomixers.

Main Results:

Achieved a widely tunable dual mode laser diode with a single cavity structure.
Demonstrated continuous and independent wavelength tuning of each mode via integrated micro-heaters.
The laser diode exhibited wide tunability of optical beat frequency from 0.48 THz to over 2.36 THz.
Successfully generated continuous wave THz radiation from 0.48 GHz to 1.5 THz.

Conclusions:

The demonstrated dual mode laser diode offers a novel approach for tunable THz radiation generation.
The single cavity design with independent mode tuning provides enhanced control over THz output.
This technology holds potential for various THz applications requiring tunable sources.