研究目的
To demonstrate soliton mode-locking in a thulium-doped fibre laser (TDFL) by evanescent field interaction with a reduced graphene oxide-titanium dioxide saturable absorber (rGO-TiO2 SA), achieving the longest central lasing wavelength in this configuration.
研究成果
The rGO-TiO2 coated D-shaped fiber successfully induces soliton mode-locking in a TDFL, achieving a central wavelength of 1939.4 nm with high stability. This configuration offers potential for applications in medicine and other fields requiring eye-safe laser operations.
研究不足
The study is limited by the relatively low pulse energy of 0.0127 nJ and the need for further optimization of the SA's modulation depth and saturation intensity for broader applications.
1：Experimental Design and Method Selection
The study employs a passively mode-locked TDFL configuration using a D-shaped fiber coated with rGO-TiO2 nanoparticles as the SA. The design leverages evanescent field interaction for mode-locking.
2：Sample Selection and Data Sources
The rGO-TiO2 solution is prepared via a hydrothermal technique, and its properties are characterized using UV–vis spectroscopy, Raman spectroscopy, and FESEM. The D-shaped fiber is fabricated by polishing one side of an SMF-28 fiber.
3：List of Experimental Equipment and Materials
Includes a Varian Cary 50 UV–visible spectrophotometer, Renishaw Raman Microscope, Hitachi SU8220 FESEM, Yokogawa AQ6375 OSA, Keysight DS0X3102T OSC, Anritsu MS2683 RFSA, and Thorlabs optical power meter.
4：Experimental Procedures and Operational Workflow
The rGO-TiO2 solution is coated onto the D-shaped fiber, which is then integrated into a TDFL cavity. The laser's spectral and temporal characteristics are analyzed to assess performance.
5：Data Analysis Methods
Nonlinear absorption measurements are conducted using the twin-detector technique. The optical and RF spectra are analyzed to determine stability and performance metrics.
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Hitachi SU8220 field emission scanning electron microscope
SU8220
Hitachi
Analyzing the structure and morphology of the rGO-TiO2 nanomaterial
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Yokogawa AQ6375 optical spectrum analyzer
AQ6375
Yokogawa
Analyzing the spectral characteristics of the output laser
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Keysight DS0X3102T oscilloscope
DS0X3102T
Keysight
Analyzing the pulse train characteristics
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Anritsu MS2683 radio-frequency spectrum analyzer
MS2683
Anritsu
Measuring the signal-to-noise ratio (SNR) of the output pulse
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Varian Cary 50 UV–visible spectrophotometer
Cary 50
Varian
Analyzing the UV–vis spectrum of the rGO-TiO2 solution
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Renishaw Raman Microscope
Renishaw
Obtaining the Raman spectrum of the rGO-TiO2 solution
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Thorlabs optical power meter
Thorlabs
Measuring the optical power of the generated pulse
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