研究目的
The study aims to investigate the photobleaching of submicron DAST crystals in a PMMA film by direct laser writing to form a 2D grating with periodic modulation of the nonlinear optical coefficient, essential for quasi-phasematching generation.
研究成果
The study confirmed the ability to write 2D gratings in PMMA films with submicron DAST crystals using direct laser writing, achieving lines with widths less than 1 μ m without damaging the layer. This method is promising for creating structures with quasi-phasematching for nonlinear optical applications.
研究不足
The study is limited to 2D writing due to the wavelength of the laser used (532 nm), which is close to the absorption peak of the material. 3D writing would require two-photon absorption at a different wavelength.
1：Experimental Design and Method Selection:
The study involves direct laser writing on DAST crystals embedded in a PMMA film to investigate photobleaching effects.
2：Sample Selection and Data Sources:
Samples were prepared by spin-coating a mixture of PMMA and DAST solutions, followed by annealing to transform amorphous DAST into crystalline state.
3：List of Experimental Equipment and Materials:
Equipment includes a Nd-YAG laser, piezoelectric translator, avalanche photodiode, and optical microscope. Materials include PMMA (Plexiglas? V045) and DAST (Genolite Biotek).
4：Experimental Procedures and Operational Workflow:
Laser writing was performed at various powers and speeds, followed by luminescence scanning and optical microscopy to analyze the effects.
5：Data Analysis Methods:
The effects of laser writing were analyzed through luminescence mapping and optical microscopy.
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