| Output beam analysis of high power COIL |
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| 作者姓名： | 于德利 桑凤亭 金玉奇 孙以珠 |
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| 作者单位： | Dalian Institute of Chemical Physics，Chinese Academy of Sciences，Dallan 116023 Nanyang Technological University，EEE，Block S1，Nanyang Avenue，Singapore 639798，Dalian Institute of Chemical Physics，Chinese Academy of Sciences，Dalian 116023，Dalian Institute of Chemical Physics，Chinese Academy of Sciences，Dalian 116023，Dalian Institute of Chemical Physics，Chinese Academy of Sciences，Dalian 116023 |
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| 摘 要： | As the output power of a chemical oxygen iodine laser (COIL) increases, the output laser beam instability appears as the far-field beam spot drift and deformation for the large Presnel number unstable resonator. In order to interpret this phenomenon, an output beam mode simulation code was developed with the fast Fourier transform method. The calculation results show that the presence of the nonuniform gain in COIL produces a skewed output intensity distribution, which causes the mirror tilt and bulge due to the thermal expansion. With the output power of COIL increases, the mirror surfaces, especially the back surface of the scraper mirror, absorb more and more heat, which causes the drift and deformation of far field beam spot seriously. The initial misalignment direction is an important factor for the far field beam spot drifting and deformation.
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Output beam analysis of high power COIL |
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| Abstract: | As the output power of a chemical oxygen iodine laser (COIL) increases, the output laser beam instabilityappears as the far-field beam spot drift and deformation for the large Fresnel number unstable resonator.In order to interpret this phenomenon, an output beam mode simulation code was developed with the fastFourier transform method. The calculation results show that the presence of the nonuniform gain in COILproduces a skewed output intensity distribution, which causes the mirror tilt and bulge due to the thermalexpansion. With the output power of COIL increases, the mirror surfaces, especially the back surface ofthe scraper mirror, absorb more and more heat, which causes the drift and deformation of far field beamspot seriously. The initial misalignment direction is an important factor for the far field beam spot driftingand deformation. |
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