研究目的
Investigating the high-quality tuning of cholesteric liquid crystal lasers based on a polymer composite system.
研究成果
The ChLC laser based on the polymer-LC composite system with equal parts of the polymer and LC retains high slope efficiency, low threshold, and narrow spectral linewidth throughout tuning operation, demonstrating fully continuous wavelength tuning over a 13 nm range.
研究不足
The study focuses on specific compositions of polymer-LC composites and their lasing characteristics under electric fields. Potential areas for optimization include further reducing light scattering and expanding the tuning range.
1：Experimental Design and Method Selection:
The study involves the fabrication of polymer-LC composite films by photopolymerizing mixtures of LC monomers and LCs, and examining their optical and lasing properties under electric fields.
2：Sample Selection and Data Sources:
Samples with varying weight ratios of LC monomer, nematic LC, and chiral dopant were prepared.
3：List of Experimental Equipment and Materials:
Includes UV light sources, multichannel spectrometer, scanning electron microscope, and laser measurement setup.
4：Experimental Procedures and Operational Workflow:
Involves cooling the samples to obtain a monodomain Grandjean texture, polymerizing with UV light, and measuring reflection, transmission, and lasing characteristics under electric fields.
5：Data Analysis Methods:
Analysis of reflection and transmission spectra, lasing threshold, slope efficiency, and spectral linewidth.
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UCL-011NT1
DIC Inc.
Photopolymerizable nematic LC monomer used in the polymer-LC composite system.
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RDP-94990
DIC Inc.
Nematic LC mixture used in the polymer-LC composite system.
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DDS-1015R
LCC Inc.
Right-handed chiral component used to induce helical structure in the LC.
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Pyrromethene 597
Exciton
Laser dye used as the gain medium in the ChLC laser.
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IRUGACURE819
Ciba
Photoinitiator used to compensate for the decrease in polymerization speed due to absorption of the laser dye.
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LC-L1
Hamamatsu Photonics
UV light source for polymerization.
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PMA-12
Hamamatsu
Multichannel spectrometer for measuring reflection and transmission spectra.
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SU-6600
Hitachi
Scanning electron microscope for observing polymer structure.
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FDSS532-Q2
CryLas
Pump source for lasing measurement.
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iHR320
Horiba Scientific
Imaging spectrometer for monitoring emission spectrum.
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PD300UV
Ophir
Calibrated power meter for measuring input and output powers of the laser.
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