Yuzhen Liao, Deen Wang, Xuewei Deng, Xin Zhang, Ying Yang, Yuyuan Guo, Shengheng Zheng, Qiang Yuan, Dongxia Hu. Influence of structural surface roughness on self-excited oscillation of main amplification system of high power laser device[J]. High Power Laser and Particle Beams, 2020, 32(1): 011020
- High Power Laser and Particle Beams
- Vol. 32, Issue 1, 011020 (2020)
Fig. 1. Amplifier optical path structure and self-oscillation time waveform in the back of cavity mirror
Fig. 2. Ablative trace near the aperture of the spatial filter
Fig. 3. Two-dimensional Gaussian rough surface constructed by Monte-Carlo method
Fig. 4. Simulated circular light spot which is reflected by a Gaussian rough surface
Fig. 5. Resonant cavity between the orifice plate and the cavity mirror
Fig. 6. Surface roughness comparison of samples prepared by shot blasting
Fig. 7. Relationship between aperture size, surface roughness and the proportion of reflected laser entering the main amplification system
Fig. 8. Experiment procedure
Fig. 9. Spot image collected on CCD
Fig. 10. Simulated spot image
Fig. 11. Statistical distribution of light intensity
Fig. 12. Increasing the surface roughness of the structure
Fig. 13. Self-oscillation waveform test before and after increasing the surface roughness of the structure
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Table 1. Qualitative division of surface roughness
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Table 2. Comparison of sample surface process statistics
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