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Grain Boundary Induced Ultralow Threshold Random Laser in a Single GaTe Flake
Zuxin Chen1,2, Yingjun Zhang3, Sheng Chu4
1Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China.
Researchers developed a new random laser (RL) using polycrystalline Gallium Telluride (GaTe) microflakes. This novel random laser achieves an ultra-low lasing threshold, making it suitable for optoelectronic applications.
Area of Science:
- Materials Science
- Optics
- Condensed Matter Physics
Background:
- Random lasing (RL) occurs in disordered media, requiring strong scattering for effectiveness.
- Achieving low thresholds in random lasers is crucial for practical applications.
Purpose of the Study:
- To report a novel random laser (RL) utilizing polycrystalline Gallium Telluride (GaTe) microflakes.
- To demonstrate an ultra-low lasing threshold in GaTe-based random lasers.
- To investigate factors influencing the performance of these random lasers.
Main Methods:
- Fabrication of individual polycrystalline GaTe microflakes (MFs).
- Characterization of lasing properties under optical pumping.
- Analysis of light scattering and trapping mechanisms within the MFs.
- Investigation of temperature and pumping intensity effects on localized cavities.
Main Results:
- A random laser (RL) was successfully realized using polycrystalline GaTe MFs.
- An ultra-low lasing threshold of 4.15 kW cm-2 was achieved, significantly lower than previous reports.
- Reduced grain size in GaTe MFs enhances light scattering and trapping, leading to the low threshold.
- The study explored the relationship between cavity dimensions, pumping intensity, and temperature.
Conclusions:
- Polycrystalline GaTe microflakes offer a promising platform for low-threshold random lasers.
- The findings present a viable method for creating compact, efficient random lasers.
- This research opens new possibilities for optoelectronic devices utilizing random lasing principles.
