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Single-frequency fiber lasers based on metal thiophosphites with sub-kHz linewidths
Yiyu Gan1, Wenyao Zhang1, Qiao Wen1
1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. wenqiao@szu.edu.cn.
Nanoscale
|January 3, 2024
Summary
Researchers developed novel single-frequency fiber lasers using chromium thiophosphites (CrPX₄). These lasers demonstrate enhanced performance, with one achieving a record-narrow linewidth for this laser type.
Area of Science:
- Materials Science
- Optoelectronics
- Laser Physics
Background:
- Metal thiophosphites (CrPX₄) are emerging layered materials with applications in electronics and magnetism.
- Their use in single-frequency fiber lasers (SFFLs) is underexplored.
Purpose of the Study:
- To investigate the potential of CrPX₄ materials in SFFLs.
- To develop novel SFFLs utilizing CrPX₄-based saturable absorbers.
Main Methods:
- Liquid phase exfoliation to obtain few-layered CrPX₄ nanosheets.
- Fabrication of CrPX₄-based saturable absorbers (CrPX₄-SA) on D-shaped fibers.
- Integration of CrPX₄-SA into fiber laser cavities.
Main Results:
- Successful creation of two stable SFFLs using CrPS₄ and CrPSe₄ at ~1550 nm.
- CrPSe₄-based SFFL achieved a record-narrow linewidth of ~375 Hz and SNR of 74.17 dB.
- Maximum output powers of 0.796 mW and 0.963 mW with low power fluctuations (2.5% and 1.4%).
Conclusions:
- CrPX₄ materials are effective for developing high-performance SFFLs.
- The developed CrPSe₄-based SFFL exhibits state-of-the-art narrow linewidth performance.
- This work opens new avenues for CrPX₄ in advanced laser applications.
