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Ultrafast mode-locked dual-wavelength thulium-doped fiber laser using a Mach-Zehnder interferometric filter
摘要： A simple and robust method to generate a dual-wavelength mode-locked laser using a tunable Mach-Zehnder filter (TMZF) and a single-wall carbon nanotube (SWCNT) based saturable absorber (SA) is proposed and demonstrated. The proposed laser uses a thulium-doped fiber for lasing in the two-micron region and exploits the interferometric spectrum of the TMZF to produce dual peaks with nearly equal magnitude. SWCNT based SA enables mode-locking at a threshold value of 150.4 mW with distinct dual-wavelength peaks at 1919.2 nm and 1963.7 nm. The peaks have a calculated pulse width of 1.8 ps and 1.6 ps, respectively with a repetition rate of 9.1 MHz with a relatively high optical-signal-to-noise ratio value of 59.1 dB. The output is also observed to remain unchanged over time, indicating high stability. The proposed laser has a promising application, particularly in ultrafast gas molecular spectroscopy and sensing.
关键词： Thulium-doped fiber laser,Mode-locking,Dual-wavelength,Mach-Zehnder filter
更新于2025-11-28 14:24:03
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Pure gold saturable absorber for generating Q-switching pulses at 2?μm in Thulium-doped fiber laser cavity
摘要： We experimentally demonstrate Q-switched Thulium-doped fiber laser operating at 1949.19 nm using pure gold saturable absorber (Au-SA) as a Q-switcher. The Au-SA was fabricated by depositing gold particles molecules using electron beam evaporation on the surface of a polyvinyl alcohol (PVA) film. Subsequently, stable Q-switched pulses were obtained within the 1552 nm pump power range from 343.1 to 467.3 mW, with repetition rate tuned from 11.7 kHz to 21.95 kHz. At 467.3 mW pump power, the TDFL produced pulses train with the pulse width of 2.6 μs and the maximum pulse energy of 89.8 nJ. These results propose that pure gold could be a promising saturable absorber for pulse generation in 2 μm wavelength region.
关键词： Thulium-doped fiber laser,Q-switching,Pure gold saturable absorber
更新于2025-11-28 14:24:03
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Comparison of A 1940 nm Thulium-Doped Fiber Laser and A 1470 nm Diode Laser for Cutting Efficacy and Hemostasis in A Pig Model of Spleen Surgery
摘要： Partial and total splenectomies are associated with a high risk of substantial blood loss. Lasers operating at wavelengths strongly absorbed by water have the potential to improve hemostasis and cut while providing a narrow zone of thermal damage. The aim of this study is to compare a thulium-doped fiber laser (TDFL) emitting a wavelength of 1940 nm and a diode laser (DL) operating at 1470 nm for spleen surgery in a pig model. A partial splenectomy and spleen incisions were made in 12 animals using the two laser devices. The hemostasis was evaluated visually during surgeries. Post-mortem and histopathological evaluations were done on days 0, 7, and 14 following surgery. Neither TDFL nor DL caused bleeding on day 0 or delayed bleeding. On day 14, pale streaks at the site of incision were slightly wider after cutting with DL than with TDFL. Histological analysis revealed a carbonized zone with exudation and a deeper zone of thermal tissue damage on day 0. The width of the thermal changes was 655.26 ± 107.70 μm for TDFL and 1413.37 ± 111.85 μm for DL. On day 7, a proliferation of fibroblasts and splenocytes was visible, as well as a formation of multinucleated giant cells adjacent to the residues of carbonization. The zone of thermal damage was broader for DL (1157.5 ± 262.77 μm) than for TDFL (682.22 ± 116.58 μm). On day 14, cutting sites were filled with connective and granulation tissues with the residues of carbonization. The zone of thermal damage was narrower for TDFL (761.65 ± 34.3 μm) than for DL (1609.82 ± 202.22 μm). Thus, both lasers are efficient in spleen surgery, providing good hemostasis. However, TDFL produces a narrower zone of thermal damage, which suggests its better efficiency for spleen surgery, especially when performing more precise procedures.
关键词： thulium-doped fiber laser (1940 nm),pig model of spleen surgery,diode laser (1470 nm),thermal damage zone,partial splenectomy,hemostasis
更新于2025-09-19 17:13:59
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Wavelength-tunable thulium-doped fiber laser with sampled fiber Bragg gratings
摘要： A continuous wave (CW) wavelength-tunable Tm3+-doped fiber laser with two sampled fiber Bragg gratings (SFBGs) has been proposed and demonstrated. This proposed laser is stable operating with a significant 14.44 nm wavelength range from 1942.09 nm to 1956.53 nm due to the Vernier effect. The laser OSNRs of different wavelengths ranged from 45 dB to 58 dB at a launched pump power of 3.67 W. The wavelength shift and power fluctuation were less than 0.03 nm and 0.46 dB, respectively. An 8.62% slope efficiency was achieved using a grating for laser extracting. To the authors’ knowledge, this is the first time that a wavelength-tunable Tm3+-doped fiber laser with two SFBGs has been demonstrated.
关键词： Wavelength-tunable,Thulium-doped fiber laser,Sampled fiber Bragg grating
更新于2025-09-16 10:30:52
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Generation of Two Dissipative Soliton Resonance Pulses in an All-Anomalous-Dispersion Regime Thulium-Doped Fiber Laser
摘要： In this paper, we demonstrate experimentally a thulium-doped passively mode-locked figure-of-eight fiber laser to generate dissipative-soliton-resonance (DSR) pulses in an all-anomalous-dispersion regime. And two different DSR pulses are obtained by simply adjusting the polarization controllers. At maximum pump power of 2.4 W, the average power and repetition rate of two DSR pulses is 113.5 mW and 2.532 MHz respectively, corresponding to a pulse energy of 45 nJ. Subsequently, the effect of NALM length on the two DSR pulses is investigated, and pulses with maximum pulse energy of 63 nJ near 2 μm are obtained.
关键词： dissipative soliton resonance,Thulium-doped fiber laser
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Improvement of soliton pulse energy in thulium-doped fiber laser
摘要： In this paper, we report a thulium-doped fiber laser based on non-polarization rotation technique. Increasing the pump power to 2500 mW and adjusting the polarization controllers, Baussian pulse with high pulse energy can be achieved. The pulse duration of de-chirped pulse is 242 fs. Due to dispersion management, most related studies are still focused on the 1 μm band, and few reports are available for the 2 μm band. By using non-polarization rotation technique, the mode-locked start-up threshold can be avoided. At the maximum pump power, the direct output power of the resonator cavity is 272.2 mW, and the corresponding single pulse energy is 1.825 nJ.
关键词： mode-locking,thulium-doped fiber laser,non-polarization rotation technique,dispersion management
更新于2025-09-16 10:30:52
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Switchable multiwavelength thulium-doped fiber laser with cylindrical vector beam emission
摘要： We experimentally demonstrate a switchable multiwavelength thulium-doped fiber laser with cylindrical vector beam (CVB) emission, which is the first report, to our best knowledge, on the generation of CVBs in a 2 μm wavelength band. The Sagnac loop filter, made up of a 50:50 coupler, a section of polarization-maintaining fiber and a polarization controller, serves as a periodical filter and accounts for the excitation of multiwavelength channels. The mode-selective coupler consisting of both tapered single-mode and four-mode fibers has been designed and fabricated as a mode converter from LP01 to LP11 mode with a purity of >80%. By adjusting the polarization controllers, laser outputs with 1–3 switchable wavelengths have been realized in the spectrum ranging from 1988–1998 nm. The laser could find miscellaneous applications in wavelength/mode-division multiplexing system, etc.
关键词： cylindrical vector beams (CVBs),thulium-doped fiber laser (TDFL),multiwavelength fiber laser,mode conversion
更新于2025-09-12 10:27:22
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Switchable multi-wavelength thulium-doped fiber laser employing a polarization-maintaining sampled fiber Bragg grating
摘要： A continuous wave, switchable multi-wavelength, thulium-doped fiber laser (TDFL) with a polarization-maintaining sampled fiber Bragg grating (PM-SFBG) is proposed and demonstrated for the first time. A length of 150 m highly-nonlinear fiber (HNLF) was used to introduce the four-wave mixing effect for the efficient suppression of the wavelength competition existing in the gain medium of thulium-doped fiber. By adjusting the state of polarization (SOP) of light in the laser cavity, two six-wavelength operations at two orthogonal SOPs and a ten-wavelength operation were obtained. When the TDFL ran at the six-wavelength operation mode with a pump power of 4.11 W, there were at least four lasing wavelengths with an optical signal-to-noise ratio (OSNR) higher than 30 dB, and when it ran at the ten-wavelength operation mode with a pump power of 4.60 W, there were nine lasing wavelengths with an OSNR higher than 30 dB. Regardless of the operation mode, the TDFL exhibited high stability.
关键词： sampled fiber Bragg grating,thulium-doped fiber laser,multi-wavelength
更新于2025-09-11 14:15:04