研究目的
Investigating the quasi-phase-matched third harmonic generation in periodic stacks of polymer bilayers.
研究成果
The fundamental wavelength of 1230 nm is close to the designed QPM condition. The study demonstrates the feasibility of QPM THG in isotropic polymer films with alternating layers of a highly nonlinear organic material and a passive resin.
研究不足
Realization of QPM THG with more periods would need more accurate evaluation of the refractive indices of each layer at the fundamental and third harmonic wavelengths, and a smaller absorption at the third harmonic wavelength.
1：Experimental Design and Method Selection:
The study focused on quasi-phase-matching (QPM) for third harmonic generation (THG) in isotropic polymer films with alternating layers of a highly nonlinear organic material and a passive resin.
2：Sample Selection and Data Sources:
Spin-coated thin films of ethyl-violet molecules mixed in an ethyl-cellulose polymer (EV) were used as the cubic medium for THG. A UV-curable resin, NOA 61 from Norland Products, was used as a phase compensating material.
3：List of Experimental Equipment and Materials:
Optical parametric generator-amplifier system was used as fundamental input.
4：Experimental Procedures and Operational Workflow:
Layered samples consisting of EV/NOA bilayer stacks were fabricated by spin-coating with the layer thicknesses equal to the respective coherence lengths. The signal from an optical parametric generator-amplifier system was used as fundamental input, and was tuned around the QPM condition of 1230 nm.
5：Data Analysis Methods:
The THG outputs were measured for different wavelengths and compared with calculated phasor diagrams for corresponding off-QPM conditions.
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