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High-power distributed feedback lasers with high-order surface curved gratings
Optics Letters
|May 23, 2023
Summary
Researchers developed a novel broad-area distributed feedback laser using curved gratings. This high-power laser offers improved output and mode selection for various applications.
Area of Science:
- Optics and Photonics
- Semiconductor Lasers
Background:
- Broad-area lasers often suffer from poor mode control and low output power.
- Distributed feedback (DFB) lasers offer wavelength selectivity but can be challenging to scale in power.
Purpose of the Study:
- To fabricate a novel broad-area DFB laser with enhanced output power and improved mode selection.
- To investigate the performance characteristics of a DFB laser utilizing high-order surface curved gratings and an unstable cavity structure.
Main Methods:
- Fabrication of a broad-area DFB laser using standard near-ultraviolet lithography.
- Incorporation of high-order surface curved gratings and an unstable cavity structure with a high-reflectivity coated rear facet.
- Implementation of current injection/non-injection regions and asymmetric waveguides for mode suppression.
Main Results:
- Achieved simultaneous increase in output power and mode selection around 1070 nm.
- Obtained a maximum output power of 915 mW with a spectral width of 0.138 nm.
- Demonstrated a threshold current of 370 mA and a side-mode suppression ratio of 33 dB.
Conclusions:
- The novel broad-area DFB laser design effectively enhances output power and mode selectivity.
- The simple manufacturing process and stable performance indicate significant potential for applications in light detection and ranging, laser pumping, and optical data storage.
