Toward a 10-W level femtosecond erbium laser operating in the 1600 nm low gain region
1.6 µm ultrafast lasers are important in biomedical applications because the wavelength is located within an attractive biological window called the near-infrared-II (NIR-II) region. However, for erbium- or thulium-doped fibers, 1.6 μm is not their typical gain wavelength; therefore, realizing a hig...
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AIP Publishing LLC
2025-01-01
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| Series: | APL Photonics |
| Online Access: | http://dx.doi.org/10.1063/5.0240027 |
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| author | Haolin Yang Ruili Zhang Sailing He |
| author_facet | Haolin Yang Ruili Zhang Sailing He |
| author_sort | Haolin Yang |
| collection | DOAJ |
| description | 1.6 µm ultrafast lasers are important in biomedical applications because the wavelength is located within an attractive biological window called the near-infrared-II (NIR-II) region. However, for erbium- or thulium-doped fibers, 1.6 μm is not their typical gain wavelength; therefore, realizing a high power femtosecond (fs) 1.6 μm laser is a challenging task. In this work, we propose a pump scheme assisted by a C-band laser. The new pump scheme can improve the gain at 1.6 μm with a mechanism originating from the re-absorption effect of the ground state and the in-band relaxation between the splitting energy levels 4I13/2b and 4I13/2a. Applying the pump scheme to the all-fiber large-mode-area (LMA) chirped pulse amplification (CPA) system, we achieve a record-high output power of ∼9.42 W, corresponding to a 262 nJ single pulse energy. The pulse duration after compression is ∼361 fs. Our approach of combining a LMA CPA system with a C-band auxiliary laser co-pumping scheme opens a way to increase the output power of an erbium-doped fiber laser by one order of magnitude in the 1600 nm region, even though this is a low gain region. |
| format | Article |
| id | doaj-art-03595c0db57d487f87bd0fe6a9f5a360 |
| institution | Kabale University |
| issn | 2378-0967 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | AIP Publishing LLC |
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| series | APL Photonics |
| spelling | doaj-art-03595c0db57d487f87bd0fe6a9f5a3602025-02-03T16:36:22ZengAIP Publishing LLCAPL Photonics2378-09672025-01-01101016103016103-610.1063/5.0240027Toward a 10-W level femtosecond erbium laser operating in the 1600 nm low gain regionHaolin Yang0Ruili Zhang1Sailing He2Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, ChinaZhejiang Engineering Research Center for Intelligent Medical Imaging, Sensing and Non-invasive Rapid Testing, Taizhou Hospital, Zhejiang University, Taizhou 318000, ChinaZhejiang Engineering Research Center for Intelligent Medical Imaging, Sensing and Non-invasive Rapid Testing, Taizhou Hospital, Zhejiang University, Taizhou 318000, China1.6 µm ultrafast lasers are important in biomedical applications because the wavelength is located within an attractive biological window called the near-infrared-II (NIR-II) region. However, for erbium- or thulium-doped fibers, 1.6 μm is not their typical gain wavelength; therefore, realizing a high power femtosecond (fs) 1.6 μm laser is a challenging task. In this work, we propose a pump scheme assisted by a C-band laser. The new pump scheme can improve the gain at 1.6 μm with a mechanism originating from the re-absorption effect of the ground state and the in-band relaxation between the splitting energy levels 4I13/2b and 4I13/2a. Applying the pump scheme to the all-fiber large-mode-area (LMA) chirped pulse amplification (CPA) system, we achieve a record-high output power of ∼9.42 W, corresponding to a 262 nJ single pulse energy. The pulse duration after compression is ∼361 fs. Our approach of combining a LMA CPA system with a C-band auxiliary laser co-pumping scheme opens a way to increase the output power of an erbium-doped fiber laser by one order of magnitude in the 1600 nm region, even though this is a low gain region.http://dx.doi.org/10.1063/5.0240027 |
| spellingShingle | Haolin Yang Ruili Zhang Sailing He Toward a 10-W level femtosecond erbium laser operating in the 1600 nm low gain region APL Photonics |
| title | Toward a 10-W level femtosecond erbium laser operating in the 1600 nm low gain region |
| title_full | Toward a 10-W level femtosecond erbium laser operating in the 1600 nm low gain region |
| title_fullStr | Toward a 10-W level femtosecond erbium laser operating in the 1600 nm low gain region |
| title_full_unstemmed | Toward a 10-W level femtosecond erbium laser operating in the 1600 nm low gain region |
| title_short | Toward a 10-W level femtosecond erbium laser operating in the 1600 nm low gain region |
| title_sort | toward a 10 w level femtosecond erbium laser operating in the 1600 nm low gain region |
| url | http://dx.doi.org/10.1063/5.0240027 |
| work_keys_str_mv | AT haolinyang towarda10wlevelfemtoseconderbiumlaseroperatinginthe1600nmlowgainregion AT ruilizhang towarda10wlevelfemtoseconderbiumlaseroperatinginthe1600nmlowgainregion AT sailinghe towarda10wlevelfemtoseconderbiumlaseroperatinginthe1600nmlowgainregion |