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Wang T, Ren B, Li C, Guo K, Leng J, Zhou P. Monolithic tapered Yb-doped fiber chirped pulse amplifier delivering 126 μJ and 207 MW femtosecond laser with near diffraction-limited beam quality. Front Optoelectron 2023; 16:30. [PMID: 37906421 PMCID: PMC10618150 DOI: 10.1007/s12200-023-00087-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 10/06/2023] [Indexed: 11/02/2023]
Abstract
In this work, a high-energy and high peak power chirped pulse amplification system with near diffraction-limited beam quality based on tapered confined-doped fiber (TCF) is experimentally demonstrated. The TCF has a core numerical aperture of 0.07 with core/cladding diameter of 35/250 µm at the thin end and 56/400 μm at the thick end. With a backward-pumping configuration, a maximum single pulse energy of 177.9 μJ at a repetition rate of 504 kHz is realized, corresponding to an average power of 89.7 W. Through partially compensating for the accumulated nonlinear phase during the amplification process via adjusting the high order dispersion of the stretching chirped fiber Bragg grating, the duration of the amplified pulse is compressed to 401 fs with a pulse energy of 126.3 μJ and a peak power of 207 MW, which to the best of our knowledge represents the highest peak power ever reported from a monolithic ultrafast fiber laser. At the highest energy, the polarization extinction ratio and the M2 factor were respectively measured to be ~ 19 dB and 1.20. In addition, the corresponding intensity noise properties as well as the short- and long-term stability were also examined, verifying a stable operation of the system. It is believed that the demonstrated laser source could find important applications in, for example, advanced manufacturing and photomedicine.
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Affiliation(s)
- Tao Wang
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Bo Ren
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Can Li
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China.
| | - Kun Guo
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Jinyong Leng
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, 410073, China
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, 410073, China
| | - Pu Zhou
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China.
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Hua P, Ding Z, Liu K, Guo H, Pan M, Zhang T, Li S, Jiang J, Liu T. Distributed optical fiber biosensor based on optical frequency domain reflectometry. Biosens Bioelectron 2023; 228:115184. [PMID: 36878065 DOI: 10.1016/j.bios.2023.115184] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 02/09/2023] [Accepted: 02/25/2023] [Indexed: 03/05/2023]
Abstract
In situ acquisition of spatial distribution of biochemical substances is important in cell analysis, cancer detection and other fields. Optical fiber biosensors can achieve label-free, fast and accurate measurements. However, current optical fiber biosensors only acquire single-point of biochemical substance content. In this paper, we present a distributed optical fiber biosensor based on tapered fiber in optical frequency domain reflectometry (OFDR) for the first time. To enhance evanescent field at a relative long sensing range, we fabricate a tapered fiber with a taper waist diameter of 6 μm and a total stretching length of 140 mm. Then the human IgG layer is coated on the entire tapered region by polydopamine (PDA) -assisted immobilization as the sensing element to achieve to sense anti-human IgG. We measure shifts of the local Rayleigh backscattering spectra (RBS) caused by the refractive index (RI) change of an external medium surrounding a tapered fiber after immunoaffinity interactions by using OFDR. The measurable concentration of anti-human IgG and RBS shift has an excellent linearity in a range from 0 ng/ml to 14 ng/ml with an effective sensing range of 50 mm. The concentration measurement limit of the proposed distributed biosensor is 2 ng/ml for anti-human IgG. Distributed biosensing based on OFDR can locate a concentration change of anti-human IgG with an ultra-high sensing spatial resolution of 680 μm. The proposed sensor has a potential to realize a micron-level localization of biochemical substances such as cancer cells, which will open a door to transform single-point biosensor to distributed biosensor.
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Affiliation(s)
- Peidong Hua
- School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin, 300072, China; Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin, 300072, China
| | - Zhenyang Ding
- School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin, 300072, China; Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin, 300072, China.
| | - Kun Liu
- School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin, 300072, China; Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin, 300072, China
| | - Haohan Guo
- School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin, 300072, China; Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin, 300072, China
| | - Ming Pan
- School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin, 300072, China; Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin, 300072, China
| | - Teng Zhang
- School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin, 300072, China; Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin, 300072, China
| | - Sheng Li
- School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin, 300072, China; Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin, 300072, China
| | - Junfeng Jiang
- School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin, 300072, China; Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin, 300072, China
| | - Tiegen Liu
- School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin, 300072, China; Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin, 300072, China
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