研究目的
Investigating the ablation effects on allyl‐diglycol CR39 polymer induced by laser irradiation at 157?nm F2 laser (VUV) and 248?nm KrF laser for optical waveguides application.
研究成果
The study demonstrates that CR39 polymer can be effectively modified by laser irradiation for optical waveguide applications, with a determined ablation threshold and refractive index changes. The mechanism responsible for the refractive index change is suspected to be due to photothermal effect.
研究不足
The study is limited to the specific wavelengths of 157?nm and 248?nm for laser ablation on CR39 polymer. The exact mechanism leading to the variation of the CR39 refractive index is yet to be determined.
1：Experimental Design and Method Selection:
The study focuses on using F2 (157?nm laser) and KrF (248?nm laser) to obtain ablation threshold for CR39 polymer at these wavelengths. Refractive index of CR39 is changed by varying the laser fluences using continuous wave laser.
2：Sample Selection and Data Sources:
CR39 polymer samples were used, with thicknesses of 1?mm and 0.5?mm for different experiments.
3：5?mm for different experiments.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A 157?nm VUV F2 laser (Lambda Physik LPF 200), KrF excimer laser (Opto Systems Ltd Excimer Laser series CL5100), and a frequency‐doubled argon ion laser emitting at 244?nm were used. A motorized stage and a three‐axis x‐y‐z translational platform were used for sample positioning.
4：Experimental Procedures and Operational Workflow:
For pulse laser, an aperture size of 6?×?3?mm is aligned and positioned in front of the lens to ensure substantial edge of craters can be seen on the film. For continuous wave laser, the laser beam is focused by a 25‐mm focusing lens onto the CR39, placed onto a three‐axis stepper motor.
5：Data Analysis Methods:
The ablation threshold was determined from the etch rate per pulse versus fluence plots. Refractive index change was calculated from the numerical aperture (NA) measurement on the written waveguides.
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