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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
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Noise-Like Pulse Generation Using Polarization Maintaining Mode-Locked Thulium-Doped Fiber Laser With Nonlinear Amplifying Loop Mirror
摘要： We investigate noise-like pulse (NLP) generation in a mode-locked thulium-doped fiber laser with nonlinear amplifying loop mirror (NALM) and different net anomalous dispersions. The all-polarization maintaining (PM) fiber oscillator generates pulse trains with a frequency adjustable in the range of 4.06–20.4 MHz by utilizing different lengths of PM passive fiber in the NALM loop. An NLP with a coherence spike width of 232 fs was generated at 1993.6 nm with a 3-dB spectral width of 32.6 nm when the net cavity dispersion was ?0.711 ps2.
关键词： thulium-doped fiber,mode-locked laser,NALM,fiber laser,noise-like generation
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Short-Wavelength, Near-Diffraction-Limited Beam, 792 nm Cladding Pumped Efficient Thulium-Doped Fiber Laser in a Power-Scalable Fiber Design
摘要： Thulium-doped fiber lasers (TDFLs) offer a broad 3F4 → 3H6 emission band ~1600-2200 nm. Thanks to “two-for-one” cross-relaxation process in TDFLs, that enables to achieve output power > 1 kW at ~2045 nm with 0.79-μm cladding-pumping. Efficient cross-relaxation requires high Tm-concentration ( > 3wt%). This results in a high core refractive index (thus higher V-number) that degrades the beam quality. It also increases the thermal load per unit length, although this can be reduced by a large cladding-to-core area ratio that increases the absorption length of the fiber. A long fiber also shifts the emission to long wavelengths with more signal re-absorption. For short-wavelength emission the re-absorption must be reduced in some other way, which also ensures adequate total pump absorption. Simplest technique is to reduce the area ratio, but then excessive thermal load or inefficient cross-relaxation (if the Tm-concentration is low to reduce the thermal load per unit length) hampers power-scaling.
关键词： short-wavelength,Thulium-doped fiber lasers,power-scalable fiber design,near-diffraction-limited beam
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - High Energy Dissipative Soliton Resonance in a Thulium-Doped Fiber Laser at 1750 nm
摘要： In recent years, the popular thulium-doped fiber lasers (TDFL) are expanding their operational wavelength coverage through accessing the 1.7-μm region, where they have previously been hindered by the quasi-three-level nature of TDF emission, which leads to strong re-absorption of short wavelength light. This was driven by a plenty of applications such as deep bio-imaging, spectroscopic analysis and material processing that takes advantages of the third near-infrared (NIR3) optical window (1600–1870 nm) for bioimaging and abundant molecular absorptions in this spectral region. At present, short wavelength TDFLs have been demonstrated to operate in the continues-wave (CW), soliton mode-locking and gain-switching regimes. Here we report a TDFL that demonstrates dissipative soliton resonance (DSR) at 1750 nm with a maximum single pulse energy of 321.2 nJ.
关键词： high energy,thulium-doped fiber lasers,1750 nm,1.7-μm region,dissipative soliton resonance
更新于2025-09-11 14:15:04