Femtosecond laser processing stainless steel foil and its Fourier spectrum detection
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Vol.16 No.6, 1 November 2020
Femtosecond laser processing stainless steel foil and its Fourier spectrum detection* TU Dong-ming (⎲ߜ᰾)1, MA Hao-yue (哫ⳃᴸ)1, JIANG Xiao-rui (⊏ᲃ⪎)1, LIU Hong-liang (ࡈ⍚Ӟ)1, WU Peng-fei (↖呿伎)1, SONG Li-wei (ᆻ・Տ)2**, and WANG Ming-wei (⦻᰾Տ)1** 1. Institute of Modern Optics, Nankai University, Tianjin 300350, China 2. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800, China1 (Received 30 December 2019) ©Tianjin University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2020 In this paper, we use femtosecond laser pulse to scribe 304 stainless steel foil, detect the Fourier transform infrared spectrum of the sample before and after processing, confirm the "cold processing" and "thermal processing" and their mutual conversion, and determine the "cold processing" parameter window. The ablation threshold and incubation coefficient of 304 stainless steel foil are calculated, and the effects of scanning speed and effective pulse number on the ablation threshold are analyzed. The ANSYS software is used to simulate the radial and axial temperature distributions of the surface on 304 stainless steel foil sample and the heat-affected zone with a femtosecond laser fluence of 10 J/cm2 and an effective number of pulses of 1 200 are obtained. In the aspect of spectral detection, the Fourier transform infrared spectra of the sample before and after processing are measured and two processing mechanisms of "cold processing" and "hot processing" are confirmed, which proves that we can achieve the conversion between "cold processing" and "hot processing" by changing the laser fluence and determine the "cold processing" laser fluence range. Document code: A Article ID: 1673-1905(2020)06-0471-6 DOI https://doi.org/10.1007/s11801-020-9223-x
Femtosecond laser refers to a laser with a pulse width of femtoseconds (1 fs=10-15 s). Due to the extremely short pulse width, the femtosecond laser can generate ultra-high instantaneous power density after being focused, which leads to nonlinear multi-photon absorption when interacting with materials[1]. This interacting mechanism enables femtosecond laser to process metals[2], semiconductors[3], fiber resins[4], organic polymers[5], ceramics[6], biological tissues[7,8], and other materials. Micro-machining with small heat-affected area or even "cold machining" without heat transfer[9] and also micro-machining spatial accuracy beyond the diffraction limit can be obtained. So it has unparalleled advantages compared with traditional mechanic machining and long-pulse laser machining, and has unique importance in the field of ultra-precision machining[10]. In order to achieve femtosecond "cold machining", we need to find an effective method to identify the "cold processing" and "hot processing" and determine the "cold processing" laser parameter window. The 304 stainless steel is the most widely used chromium-nickel stainless steel for its good corrosion resis*
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