研究目的
Investigating and developing an electrically tunable liquid-crystal?polymer composite laser with a symmetric sandwich structure for potential applications in sensors, medical imaging, displays, and lighting.
研究成果
The study successfully demonstrated an electrical PBG-broadening and lasing-tunable LC?polymer composite symmetric sandwich sample. The electrical tuning of the lasing emission is caused by the electrically induced broadening of the oscillated PBG of the PSCLC bilayer. The proposed tunable laser with sandwich structure has high potential for adding on more functions and applications in sensors, medical imaging, displays, and lighting.
研究不足
The broadening of the PBG of the PSCLC will be reduced by the screening effect when the applied time of the dc field is as long as a couple of minutes, which is a common problem in dc-driven LC devices and can limit the laser tunability.
1：Experimental Design and Method Selection:
The study involves the fabrication of a symmetric sandwich structure consisting of two identical polymer-stabilized cholesteric liquid-crystal (PSCLC) layers and a dye-doped nematic LC (DDNLC) layer sandwiched between them. The PSCLC layers act as distributed Bragg reflectors, and the DDNLC layer acts as a half-wave plate with a gain medium. The entire cell functions as an optical cavity where resonant modes occur at the maxima of the cell’s transmission spectrum.
2：Sample Selection and Data Sources:
The materials used include negative NLC MJ042782, right-handed chiral dopants R811 and R1011, chiral monomer RM691, and photoinitiator Irg369 for the PSCLC layers. The DDNLC mixture was prepared by doping laser dyes DCM and P597 in the host positive NLC HTW-
3：List of Experimental Equipment and Materials:
1142 The experimental setup includes a Q-switch Nd:YAG second harmonic generation pulse laser for pumping, a fiber-based spectrometer for measuring lasing emission and reflection/transmission spectra, and various optical components like lenses and wave plates.
4：Experimental Procedures and Operational Workflow:
The PSCLC layers were fabricated by filling the polymerizable CLC mixture into cells, irradiating under UV light for polymerization, and then combining with a DDNLC layer to form the sandwich structure. The lasing emission and reflection/transmission spectra were measured under various applied voltages.
5：Data Analysis Methods:
The lasing emission spectra and reflection/transmission spectra were analyzed to determine the effects of the applied electric field on the PBG and lasing wavelength.
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MJ042782
Merck
Negative NLC used in the PSCLC layers
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R811
Fusol-Material
Right-handed chiral dopant used in the PSCLC layers
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R1011
Fusol-Material
Right-handed chiral dopant used in the PSCLC layers
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RM691
Merck
Chiral monomer used in the PSCLC layers
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Irg369
Pufeng
Photoinitiator used in the PSCLC layers
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DCM
Exciton
Laser dye doped in the DDNLC layer
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P597
Exciton
Laser dye doped in the DDNLC layer
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HTW-114200
Fusol-Material
Host positive NLC used in the DDNLC layer
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LAB 130-10
Spectra-Physics
Q-switch Nd:YAG second harmonic generation pulse laser used as the pump source
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USB2000
Ocean Optics
Fiber-based spectrometer used for measuring lasing emission and reflection/transmission spectra
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