研究目的
To demonstrate a simple, compact double-pass pumped Nd:YVO4 thin disk laser and investigate its continuous-wave performance with different Nd doping concentrations and thicknesses experimentally, including a numerical analysis and experimental study of the temperature distribution and thermal lens effect.
研究成果
The study successfully demonstrated a compact double-pass pumped Nd:YVO4 thin disk laser, achieving a maximum output power of 17.7 W with an optical-to-optical efficiency of 46%. The numerical analysis of temperature distribution and thermal lens effect matched well with experimental results, validating the theoretical model. The 0.5 at.% doped system showed higher output power and efficiency, while the 1 at.% doped system had better beam quality at maximum output power.
研究不足
The study was limited by the sensitivity of the system to thermal lens effects at high pump powers, which could lead to instability or disappearance of the output power. The beam quality was also affected by thermal effects, with higher doping concentrations leading to worse beam quality at maximum output power.
1：Experimental Design and Method Selection:
The study involved designing a double-pass pumped Nd:YVO4 thin disk laser setup to investigate its performance under different doping concentrations and thicknesses. Theoretical models for temperature distribution and thermal lens effect were employed.
2：Sample Selection and Data Sources:
Two types of a-cut Nd:YVO4 crystals with different doping concentrations (1 at.% and 0.5 at.%) and thicknesses were used. Data on output power, temperature distribution, and beam quality were collected.
3：5 at.%) and thicknesses were used. Data on output power, temperature distribution, and beam quality were collected.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup included a fiber-coupled laser diode, Nd:YVO4 crystals, a water-cooled heat sink, and indium foils for thermal contact.
4：Experimental Procedures and Operational Workflow:
The laser's performance was tested under continuous-wave operation, measuring output power and temperature at different absorbed pump powers. Beam profiles were monitored to assess beam quality.
5：Data Analysis Methods:
Numerical analysis was performed using COMSOL Multiphysics software and MATLAB to simulate temperature distribution and thermal lens effect, comparing these with experimental results.
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