研究目的
To demonstrate the fabrication and characterization of chalcogenide glass microsphere lasers operating at the ～1.9-μm spectral band using a Tm3+-doped 2S2G glass as the base material.
研究成果
The study successfully demonstrated the fabrication and characterization of high-quality 2S2G microsphere lasers operating at the ～1.9-μm spectral band. The microspheres exhibited high quality factors, low laser thresholds, and significant thermal sensitivity, making them promising for various active optical/photonic devices in the MIR spectrum.
研究不足
The thermal resolution of the 2S2G microsphere laser is limited by the spectral resolution of the OSA, which is 0.05 nm, resulting in a thermal resolution of 1.69 °C. Supplementary temperature controlling mechanisms are necessary for stable operation.
1：Experimental Design and Method Selection
A droplet sphere-forming method was employed to form 2S2G microspheres. The method involves dropping glass powders through a vertical heating chamber purged with inert gas, where they are melted and transformed into microspheres by surface tension.
2：Sample Selection and Data Sources
Tm3+-doped germanium gallium antimony sul?de (Ge20Ga5Sb10S65, or 2S2G) glass was used as the base material. Microspheres of various diameters were produced and characterized.
3：List of Experimental Equipment and Materials
Customized commercial furnace (Sante Inc., model number: STGK-40-12), 808-nm laser diode (Changchun New Industrial Optoelectronics Tech. Co., model: MDL-III-808L/1–100 mW), Optical Spectrum Analyzer (OSA, Yokogawa, model: AQ6375), infrared photodetector (Thorlabs, model: PDA10CS-EC).
4：Experimental Procedures and Operational Workflow
Glass powders were dropped through a vertical heating chamber to form microspheres. Microspheres were then coupled with silica ?ber tapers for optical characterizations. An 808-nm laser diode was used to excite ?uorescence light in microspheres, which was then analyzed for spectral and power characteristics.
5：Data Analysis Methods
Transmission spectra and WGM patterns were analyzed to determine the quality factors and laser characteristics of the microspheres. The relationship between output laser power and absorbed pump power was plotted to determine laser thresholds.
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