5 September 2002 Annular coaxial waveguide CO2 laser with rf discharge and diffusion cooling
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It has been proved that gain volume scaling can be successfully applied to achieve high output power and a compact design. The waveguide material is metallic and diffusion-cooled, thus heat removal is more efficient. It is easy for the annular system consisting of two coaxial tubes to keep in shape and maintain mechanical stability. Annular gain media offer large gain volume with short axial dimensions. The resonator structure, principles of gain volume scaling and characteristics of the output power are presented in this paper. The outer diameter of annular waveguide walls is 20mm; an output power of 75W at wavelength 10.6µm has been obtained from a guide gap of 2.25mm and a gain length of 150mm. The annularly shaped output beam can be used directly for making holes. Moreover, according to its axisymmetrical structure and the law of refraction, by using two small prisms of the exact same material, it is possible to transform the annular beam into a solid beam by careful selection of the incident angle. Further, the diameter of the annular beam varies once the space between two prisms is changed.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yuanfang Lin, Yuanqing Huang, "Annular coaxial waveguide CO2 laser with rf discharge and diffusion cooling", Proc. SPIE 4914, High-Power Lasers and Applications II, (5 September 2002); doi: 10.1117/12.481829; https://doi.org/10.1117/12.481829

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