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Large-aperture beam expander for 40 kilowatt laser system: design and wavefront analysis
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DOI：10.1117/1.OE.65.4.045101.png)
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Abstract
En 中文
To enhance the resistance to high-power laser irradiation and environmental thermal stability of the off-axis laser beam expander in high-power laser systems. We proposed an all-Invar flexible hollowed-out support structure and established a theoretical model based on the finite element method, wavefront fitting, and ray tracing. Using the RMS as the evaluation factor, an optimized design was carried out. Furthermore, simulation analysis and experimental tests were conducted, focusing on the effects of laser thermal distortion and ambient temperature. The research results indicate that the thermal distortion induced by the 40 kW laser on the 400 mm aperture off-axis beam expander is minimal, with a wavefront aberration RMS value of 15.74 nm. At ambient temperatures of -40 degrees C and +60 degrees C, the system wavefront aberration RMS values are 39.1 and 28.5 nm, respectively, both below the diffraction limit. The experimental measurement results support the simulation analysis findings. This study provides valuable insights for the design and implementation of high-power laser systems.
Keywords:
high power laser
off-axis laser beam expander
thermal effect
wavefront aberration RMS
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