研究目的
Investigating the 3D spatio-temporal thermal profile of joule-class Yb3+-based laser amplifiers to mitigate thermal effects that lead to spatial phase aberrations and material damage.
研究成果
The benchmarked 3D spatio-temporal thermal pro?le model provides crucial insights into the thermal effects within pumped active materials, enabling the mitigation of spatial phase aberrations and material damage in joule-class laser amplifiers.
研究不足
The applicability of the scanning method to joule-class laser ampli?ers is currently limited due to the large active material radius, low ampli?er repetition rates, and the vast material dataset required for calibration.
1：Experimental Design and Method Selection:
A detailed, spatio-temporal numerical simulation was constructed using COMSOL (Version
2：2, Sweden) to model the 3D spatio-temporal thermal profile of pumped active materials. Sample Selection and Data Sources:
Various end-pumped Yb3+-doped laser-active materials (Yb:YAG, Yb:CaF2, Yb:fluorophosphate glass) were used.
3：List of Experimental Equipment and Materials:
A homogenized
4：8 kW laser diode source, thermal IR camera FLIR P620, and water-cooled mounts were utilized. Experimental Procedures and Operational Workflow:
Materials were end-pumped with empirically determined repetition rates and pulse durations, and thermal measurements were taken after reaching a steady-state regime.
5：Data Analysis Methods:
The thermal simulations were compared to surface thermal measurements for accuracy.
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