研究目的
Investigating the controllable polarization of lasing emission from a polymer microfiber laser for applications in on-chip optical communications, optical sensors, and optical switches.
研究成果
The study demonstrates a polymer microfiber laser with controllable polarization of output emission, offering potential applications in optical switches, optical modulators, and optical sensors. The ability to control the polarization by adjusting the pumping laser's polarization and direction provides a novel approach for designing microlasers with desired properties.
研究不足
The study is limited to the analysis of polarization properties under specific pumping conditions and does not explore the full range of potential applications or the scalability of the fabrication process.
1：Experimental Design and Method Selection:
The study involves the fabrication of dye-doped polymer microfibers by direct drawing from a polymer solution and the investigation of their lasing properties under optical pulse excitation. The polarization properties of the output laser are analyzed using a micro-photoluminescence (μ-PL) setup combined with a polarizer.
2：Sample Selection and Data Sources:
Polymer microfibers with various diameters ranging from about 10 to 100 μm were fabricated. The samples were selected based on their smooth outer surface for efficient optical confinement.
3：List of Experimental Equipment and Materials:
A frequency-doubled, Q-switched Nd:YAG laser (wavelength: 532 nm, pulse width: 1 ns, frequency: 60 Hz) was used as the pumping source. Other materials include Polymethylmethacrylate (PMMA), Rhodamine 6G (R6G), Araldite 506 epoxy resin, and dichloromethane (DCM).
4：Experimental Procedures and Operational Workflow:
The microfiber was placed on top of a distributed Bragg reflector (DBR) and pumped from the side. The polarization of the output laser was analyzed by rotating a polarizer in front of the spectrometer.
5：Data Analysis Methods:
The spectral linewidth of the lasing mode was measured to calculate the Q factor. The polarization property of the output laser was analyzed using the Malus’s law.
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