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Large aperture vertical cavity surface emitting laser with distributed-ring contact.

Yong-Qin Hao¹, Yan Luo, Yuan Feng

¹National Key Lab of High-Power Semiconductor Lasers, Changchun University of Science and Technology, Weixing Road 7089, Changchun, 130022, China. hyq720812@yahoo.com.cn

|March 3, 2011

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A novel distributed-ring-contact (DRC) vertical cavity surface emitting laser (VCSEL) design significantly reduces current crowding in large-aperture devices. This innovation achieves high continuous-wave output power and improved efficiency for VCSEL applications.

Area of Science:

Optoelectronics
Semiconductor Lasers
Photonics

Background:

Large-aperture top-emitting vertical cavity surface emitting lasers (VCSELs) suffer from current crowding, limiting performance.
Current crowding leads to reduced efficiency and non-uniform optical output.

Purpose of the Study:

To propose and demonstrate a distributed-ring-contact (DRC) VCSEL architecture.
To mitigate the current crowding effect in large-aperture VCSELs.
To enhance the performance metrics of top-emitting VCSELs.

Main Methods:

Fabrication of a novel distributed-ring-contact (DRC) structure for VCSELs.
Characterization of the optical output power, wall-plug efficiency, and emission profile.
Spectral analysis of the laser output.

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Main Results:

Demonstrated a maximal continuous-wave (cw) light output power exceeding 0.3 W for a 300 μm-diameter VCSEL.
Achieved a high wall-plug efficiency of 17.4%.
Observed a more homogeneous emission profile and a narrow spectral width (< 0.2 nm FWHM) at 803.3 nm.

Conclusions:

The DRC VCSEL design effectively overcomes current crowding in large-aperture devices.
The proposed structure significantly enhances output power and efficiency.
DRC VCSELs offer improved beam quality and spectral characteristics for advanced applications.