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Low-threshold random lasers based on the DCM-DEG gain system with graphene nanosheets
Optics Express
|February 24, 2023
Summary
Graphene nanosheets significantly lower the lasing threshold and enhance the quality of random lasers. Adding gold nanoparticles further reduces the threshold, offering a new method for high-quality random laser development.
Area of Science:
- Photonics and Laser Technology
- Materials Science
- Nanotechnology
Background:
- Random lasers offer unique properties but often suffer from high lasing thresholds.
- Graphene and gold nanoparticles are known for their optical and plasmonic properties.
Purpose of the Study:
- To investigate the effect of graphene nanosheets on the lasing threshold and mode quality of DCM-DEG (DD) random lasers.
- To explore the synergistic effects of graphene and gold nanoparticles for further threshold reduction.
Main Methods:
- Fabrication of random laser gain media by incorporating graphene nanosheets into a DCM-DEG solution.
- Addition of gold nanoparticles to create a hybrid graphene-gold nanoparticle system.
- Characterization of lasing threshold and mode quality under optical pumping.
Main Results:
- Graphene nanosheets significantly reduced the lasing threshold and improved mode quality of DD random lasers.
- A concentration of 0.088wt% graphene nanosheets lowered the threshold to 31.8% and increased mode quality fivefold.
- Incorporation of gold nanoparticles further reduced the lasing threshold to 5.2% of the original DD sample.
Conclusions:
- Graphene nanosheets are effective in creating low-threshold, high-quality random lasers.
- Hybrid systems combining graphene and gold nanoparticles offer a promising route for ultra-low threshold random lasers.
- This study presents a novel approach for developing advanced random laser devices.
