研究目的
Investigating the influence of structural parameters on organic semiconducting polymer lasers with an external holographic grating as feedback layer.
研究成果
The study demonstrates that a single longitudinal lasing mode can be observed only when the con?nement factor Γ is within a specific range. Optimal laser performance is achieved by selecting a reasonable thickness of the gain film and a prepolymer with a higher refractive index. This work contributes to the understanding of film thickness on organic DFB laser performance and aids in the development of organic semiconducting polymer lasers.
研究不足
The study is limited to optical pumping and does not address electrical pumping, which remains a challenging task for organic laser diodes. The optimization of laser performance is constrained by the specific range of the con?nement factor Γ.
1：Experimental Design and Method Selection:
The study involved fabricating and characterizing an organic distributed feedback laser using a semiconducting polymer gain layer and a holographic polymer dispersed liquid crystal grating as an external cavity. A model was established to calculate the con?nement factor Γ.
2：Sample Selection and Data Sources:
MEH-PPV was dissolved in chlorobenzene solvent and deposited onto glass substrates by spin coating. The thickness of the MEH-PPV ?lm was controlled by the spin speed.
3：List of Experimental Equipment and Materials:
MEH-PPV, chlorobenzene solvent, glass substrates, HPDLC grating materials including nematic LC TEB30A, N-vinylpyrrolidone, N-phenylglycine, Rose Bengal, and various monomers.
4：Experimental Procedures and Operational Workflow:
The MEH-PPV solution was spin-coated onto glass substrates, heated, and cooled. HPDLC gratings were fabricated by holographic photocuring. The samples were optically pumped by a Q-switched frequency-doubled Nd:YAG laser.
5：Data Analysis Methods:
The surface morphology of MEH-PPV ?lms was investigated by AFM. The absorption and photoluminescence spectra were measured by spectrophotometers. The lasing performance was analyzed based on the con?nement factor Γ.
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