研究目的
Investigating the manufacture and spectroscopic analysis of Tm3+-doped silica glass and microstructure optical fiber through the laser sintering technique for 2.0 μm laser applications.
研究成果
The Tm3+-doped silica glass and microstructure optical fiber made through laser sintering technique are applicable for 2.0 μm laser. The maximal output power was 740 mW with a laser slope efficiency of 16.73 %. Future work includes reducing OH? groups’ concentration to further decrease fiber loss and optimizing fiber drawing process to achieve a higher slope efficiency.
研究不足
The coupling efficiency was only 17.65 %, primarily due to large pump laser spot and poor processing of fiber pump end. The fiber loss is higher than that in commercial MCVD method, and OH? groups’ concentration was calculated to be about 14.23 ppm.
1：Experimental Design and Method Selection:
The Tm3+-doped silica glass was prepared using laser sintering technique and then made into microstructure optical fibers via stack-capillary-draw method.
2：Sample Selection and Data Sources:
The composition of the glass was
3：1Tm2O3, 1Al2O3, 9SiO2 in mol%. List of Experimental Equipment and Materials:
Spectrophotometer (Lambda 900 UV-VIS-NIR, Perkin-Elmer, UK), EPMA system (EPMA-1600, Shimadzu, Kyoto, Japan), Raman spectrometer (Renishaw InVia, London, UK), optical spectrum analyzer (NIRQuest 256, Ocean Optics, USA), power meter (Thorlabs S314C, USA).
4：Experimental Procedures and Operational Workflow:
The glass was cut, ground, and polished into a cylindrical rod. The rod was then inserted into a stack of pure silica capillaries to form a fiber preform, which was drawn into fibers at about 2000°C.
5：Data Analysis Methods:
Absorption spectrum analysis, Judd-Ofelt theory for spectroscopic properties, and measurement of laser output power and slope efficiency.
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