[1] Chang G, Tu Y L. Closed-loop control in ultrafast laser milling process using laser triggered plasma[J]. International Journal of Machine Tools and Manufacture, 60, 35-39(2012).
[2] Chen J X, Zhou X L, Lin S W et al. A prediction-correction scheme for microchannel milling using femtosecond laser[J]. Optics and Lasers in Engineering, 91, 115-123(2017).
[3] Liu Y. Study on the classification of femtosecond laser spot images based on manifold learning and ELM[D], 9-10(2019).
[4] Fu G J, Wang Y, Ren J et al. Denoising algorithms based on wavelet for pools underwater image[J]. Techniques of Automation and Applications, 32, 65-68(2013).
[5] Yao D, Zheng K Y, Liu Z D et al. Wavelet denoising in near-infrared broadband cavity-enhanced absorption spectroscopy[J]. Acta Optica Sinica, 39, 0930006(2019).
[6] Zhang J W, Feng Y, Li W. Research on wavelet denoising method based on an improved threshold function[J]. Electronic Design Engineering, 25, 137-140, 144(2017).
[7] Wang F B, Li X, Wu C et al. Integrated wavelet processing for plasma spot image produced from femtosecond laser ablating silicon wafer[J]. Laser Journal, 38, 93-96(2017).
[8] Zhang B B. The differentiability of fractal interpolation function[D], 6-7(2017).
[9] Sha Z, Ruan H J. Fractal and fitting[M]. Xu S J, Transl, 124-128(2005).
[10] Liu H Y. Calculation method of box dimension of computer image[J]. Electronic Technology & Software Engineering, 87-88(2015).
[11] Wang Q H. Research on fault diagnosis for hydraulic system based on fractal theory[D](2004).
[12] Zhang X, Liu K, Wang M D et al. Etching technology for copper-clad laminates based on femtosecond laser[J]. Acta Optica Sinica, 39, 1214003(2019).
[13] Lü J, Wang H J, Cao Z et al. Synergistic effect of microstructure on green femtosecond laser machining behavior of ZrO2 ceramics[J]. Journal of Synthetic Crystals, 49, 305-311, 330(2020).