Unusual Polarization Relation between Single-Mode Lasing Emission and Excitation Laser from an Evanescent-Wave Pumped Micro-Cavity Laser
Using a fiber of that is 125 μm in diameter in rhodamine 6G ethanol solution, controllable multi- and single-whispering-gallery-mode (WGM) optofluidic lasers based on evanescent-wave-coupled gain are both available. With multi-mode WGM emission, lasing emission with almost pure TM (transverse magnet...
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| Format: | Article |
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MDPI AG
2021-02-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/8/3/66 |
| _version_ | 1797395197847404544 |
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| author | Yuchen Wang Hongsheng Li Shu Hu Heng Li Chuanxiang Sheng |
| author_facet | Yuchen Wang Hongsheng Li Shu Hu Heng Li Chuanxiang Sheng |
| author_sort | Yuchen Wang |
| collection | DOAJ |
| description | Using a fiber of that is 125 μm in diameter in rhodamine 6G ethanol solution, controllable multi- and single-whispering-gallery-mode (WGM) optofluidic lasers based on evanescent-wave-coupled gain are both available. With multi-mode WGM emission, lasing emission with almost pure TM (transverse magnetic) or almost TE (transverse electric) modes can be obtained when the pump laser has an electric field parallel (perpendicular) to the fiber axis, i.e., the polarization direction of output laser is the same as that of the pump laser. On the other hand, when the laser emission is single-mode, the TE output laser always emerges firstly above lasing threshold, then keeps TE mode while the pump laser’s intensity increases with polarization direction perpendicular to the fiber axis; on the contrary, TE emission will dwindle relatively, while the TM emission emerges and dominates the spectra, when the pump laser’s intensity increases with polarization parallel to the fiber axis. Our work proves that controlling the leakage of the evanescent wave from high-Q microcavities is crucial for both modes of lasing emission and its polarization. |
| first_indexed | 2024-03-09T00:31:00Z |
| format | Article |
| id | doaj.art-e5ec0399534c4243b4f6401b6b6eee44 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-09T00:31:00Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-e5ec0399534c4243b4f6401b6b6eee442023-12-11T18:32:34ZengMDPI AGPhotonics2304-67322021-02-01836610.3390/photonics8030066Unusual Polarization Relation between Single-Mode Lasing Emission and Excitation Laser from an Evanescent-Wave Pumped Micro-Cavity LaserYuchen Wang0Hongsheng Li1Shu Hu2Heng Li3Chuanxiang Sheng4School of Science, Qingdao University of Technology, 777 E Jialingjiang Rd, Qingdao 266525, ChinaSchool of Science, Qingdao University of Technology, 777 E Jialingjiang Rd, Qingdao 266525, ChinaSchool of Electronic and Optical Engineering, Nanjing University of Science and Technology, 200 XiaoLingWei, Nanjing 210094, ChinaSchool of Electronic and Optical Engineering, Nanjing University of Science and Technology, 200 XiaoLingWei, Nanjing 210094, ChinaSchool of Electronic and Optical Engineering, Nanjing University of Science and Technology, 200 XiaoLingWei, Nanjing 210094, ChinaUsing a fiber of that is 125 μm in diameter in rhodamine 6G ethanol solution, controllable multi- and single-whispering-gallery-mode (WGM) optofluidic lasers based on evanescent-wave-coupled gain are both available. With multi-mode WGM emission, lasing emission with almost pure TM (transverse magnetic) or almost TE (transverse electric) modes can be obtained when the pump laser has an electric field parallel (perpendicular) to the fiber axis, i.e., the polarization direction of output laser is the same as that of the pump laser. On the other hand, when the laser emission is single-mode, the TE output laser always emerges firstly above lasing threshold, then keeps TE mode while the pump laser’s intensity increases with polarization direction perpendicular to the fiber axis; on the contrary, TE emission will dwindle relatively, while the TM emission emerges and dominates the spectra, when the pump laser’s intensity increases with polarization parallel to the fiber axis. Our work proves that controlling the leakage of the evanescent wave from high-Q microcavities is crucial for both modes of lasing emission and its polarization.https://www.mdpi.com/2304-6732/8/3/66polarizationmicrocavity laserssingle modewhispering gallery mode |
| spellingShingle | Yuchen Wang Hongsheng Li Shu Hu Heng Li Chuanxiang Sheng Unusual Polarization Relation between Single-Mode Lasing Emission and Excitation Laser from an Evanescent-Wave Pumped Micro-Cavity Laser Photonics polarization microcavity lasers single mode whispering gallery mode |
| title | Unusual Polarization Relation between Single-Mode Lasing Emission and Excitation Laser from an Evanescent-Wave Pumped Micro-Cavity Laser |
| title_full | Unusual Polarization Relation between Single-Mode Lasing Emission and Excitation Laser from an Evanescent-Wave Pumped Micro-Cavity Laser |
| title_fullStr | Unusual Polarization Relation between Single-Mode Lasing Emission and Excitation Laser from an Evanescent-Wave Pumped Micro-Cavity Laser |
| title_full_unstemmed | Unusual Polarization Relation between Single-Mode Lasing Emission and Excitation Laser from an Evanescent-Wave Pumped Micro-Cavity Laser |
| title_short | Unusual Polarization Relation between Single-Mode Lasing Emission and Excitation Laser from an Evanescent-Wave Pumped Micro-Cavity Laser |
| title_sort | unusual polarization relation between single mode lasing emission and excitation laser from an evanescent wave pumped micro cavity laser |
| topic | polarization microcavity lasers single mode whispering gallery mode |
| url | https://www.mdpi.com/2304-6732/8/3/66 |
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