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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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High-performance PCW-DFB laser diodes using offset quantum well epitaxial structures.

Qianru Lu, Yuanhao Zhang, Can Liu

|April 4, 2024

Summary

This summary is machine-generated.

We developed a high-performance partially corrugated waveguide distributed feedback (PCW-DFB) laser. This laser achieves high output power, low relative intensity noise (RIN), and a narrow linewidth for advanced applications.

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Area of Science:

Optoelectronics
Semiconductor Lasers

Background:

Distributed feedback (DFB) lasers are crucial for optical communication.
Achieving high output power, low noise, and narrow linewidth simultaneously remains a challenge.

Purpose of the Study:

To demonstrate a novel partially corrugated waveguide distributed feedback (PCW-DFB) laser.
To achieve single transverse mode operation with high performance metrics.

Main Methods:

Utilized an offset quantum-well structure to ensure sufficient threshold gain difference.
Designed the laser using a simulation model based on coupled wave equations.
Fabricated an 8-µm-wide ridge waveguide PCW-DFB laser.

Main Results:

Achieved single mode operation with a side-mode suppression ratio (SMSR) over 55 dB.
Exhibited an output power exceeding 190 mW for a 1.3 mm cavity length.
Recorded relative intensity noise (RIN) below -160.5 dB/Hz and a linewidth of 45 kHz.

Conclusions:

The developed PCW-DFB laser demonstrates excellent performance characteristics.
The offset quantum-well design effectively enables stable single transverse mode operation.
This laser is a promising candidate for applications requiring high power and spectral purity.