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Directional emission InP/GaInAsP square-resonator microlasers.

Yong-Zhen Huang¹, Kai-Jun Che, Yue-De Yang

¹State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China. yzhuang@semi.ac.cn

|October 3, 2008

Summary

We developed novel Indium Phosphide/Gallium Indium Arsenide Phosphide (InP/GaInAsP) square-resonator microlasers. These devices demonstrate low threshold current and high quality factor, enabling efficient light emission for photonic applications.

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Area of Science:

Optoelectronics
Semiconductor Physics
Nanophotonics

Background:

Indium Phosphide (InP) and Gallium Indium Arsenide Phosphide (GaInAsP) are crucial materials for optoelectronic devices.
Microlasers are essential components in integrated photonics and optical communication systems.
Square-resonator designs offer unique optical confinement properties.

Purpose of the Study:

To fabricate and characterize novel InP/GaInAsP square-resonator microlasers.
To evaluate the performance metrics, including threshold current and quality factor.
To investigate the lasing characteristics and multimode oscillation behavior.

Main Methods:

Standard photolithography and inductively-coupled-plasma etching techniques were employed for fabrication.

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Continuous-wave (cw) operation was achieved at room temperature.

Mode linewidth measurements were used to determine the quality (Q) factor.

Lasing mode wavelength and side-mode suppression ratio (SMSR) were analyzed.

Main Results:

A 20-micrometer-side square microlaser with a 2-micrometer-wide output waveguide exhibited a cw threshold current of 11 mA at room temperature.
The highest mode Q factor measured was 1.0x10^4 at an injection current of 10 mA.
Multimode oscillation was observed at 1546 nm with an SMSR of 20 dB at 15 mA injection current.

Conclusions:

The fabricated InP/GaInAsP square-resonator microlasers demonstrate promising performance for integrated photonic applications.
The achieved low threshold current and high Q factor indicate efficient light generation.
Further optimization could lead to advanced laser sources for optical communication and sensing.