研究目的
Investigating the laser induced damage threshold (LIDT) and morphology of nano-porous antire?ective silica thin ?lms under nanosecond and femtosecond laser pulses.
研究成果
Different drying methods significantly affect the LIDT of nano-porous antire?ective silica thin ?lms, with methods involving higher levels of heating shock resulting in higher LIDTs. SEM images reveal distinct damage mechanisms for nanosecond (thermal) and femtosecond (ablation) laser pulses.
研究不足
The study is limited to nano-porous antire?ective silica thin ?lms on BK7 substrates and does not explore other materials or substrates. The comparison is between nanosecond and femtosecond laser pulses at specific wavelengths.
1：Experimental Design and Method Selection:
The study involves preparing nano-porous antire?ective silica thin ?lms on BK7 substrates using dip-coating and drying them with three different heating methods. The LIDT is measured using 10 ns laser pulses at 532 nm, and the damage morphology is compared with samples irradiated by femtosecond pulses at 800 nm.
2：Sample Selection and Data Sources:
BK7 substrates are used, cleaned and coated with silica sol–gel, then dried using three different heating methods (gradual, stepwise, and fast elevation of temperature).
3：List of Experimental Equipment and Materials:
Includes a Nd:YAG laser for LIDT measurement, SEM for imaging, and materials like TEOS, NH3H2O, and ethanol for sol–gel preparation.
4：Experimental Procedures and Operational Workflow:
The samples are prepared, dried, and then irradiated with laser pulses. The damage is assessed using SEM imaging.
5：Data Analysis Methods:
The LIDT is calculated using a statistical method based on ISO11254 procedure, and SEM images are analyzed to compare damage morphologies.
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