Single-mode surface-emitting DFB lasers with a large-area oxidized aperture based on the surface grating

Area of Science:

• Optoelectronics
• Semiconductor Lasers
• Photonics

Background:

• Surface-emitting lasers are crucial for optical communication and sensing.
• Achieving high side-mode suppression ratio and low threshold current in these lasers remains a challenge.

Purpose of the Study:

• To propose and demonstrate a novel single-mode surface-emitting distributed feedback laser.
• To enhance laser performance through a unique grating design and aperture optimization.

Main Methods:

• Fabrication of an 850 nm laser incorporating a second-order grating section between two first-order grating sections.
• Utilizing a large-area rectangle-shaped oxidized aperture.
• Experimental characterization of laser performance, including side-mode suppression ratio, threshold current, and differential resistance.

Main Results:

• Successful demonstration of an 850 nm single-mode surface-emitting distributed feedback laser.
• Achieved a high side-mode suppression ratio of 47 dB.
• Obtained a low threshold current of 1.8 mA and a low differential resistance of 59 Ω.

Conclusions:

• The proposed laser design effectively achieves surface emission and removes emission degeneracy.
• The optimized structure and aperture lead to significant improvements in laser performance metrics.
• This work presents a promising approach for developing high-performance surface-emitting lasers.