Experimental investigation of femtosecond laser through-hole drilling of stainless steel with and without transverse magnetic assistance

Xia, Kaibo; Ren, Na; Lin, Qing; Li, Tao; Fu-qiang, Gao; Yang, Huayu; Song, Shiwen

doi:10.1364/ao.412621

Cited by 11 publications

(3 citation statements)

References 45 publications

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“…High-power and high-energy femtosecond lasers have gained extensive use in scientific and industrial fields for various applications, such as attosecond laser generation [1], ultrafast pump-probe spectroscopy [2], THz generation [3], and material precision micromachining [4][5][6][7]. Especially in ultrafast micro-machining, these lasers are favored because they can remove material without causing heat damage.…”

Section: Introductionmentioning

confidence: 99%

High-Power GHz Burst-Mode All-Fiber Laser System with Sub 300 fs Pulse Duration

Li,

Zhao,

et al. 2024

Photonics

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An all-fiber low-repetition-rate SESAM mode-locked fiber oscillator combined with a dispersion-managed active fiber loop produces a flexible GHz burst-mode laser source. The high-power output is then produced by amplifying the GHz burst-mode laser source using an all-fiber chirped-pulse amplification system. Then, the laser is compressed using a grating pair compressor; a maximum amplified power of 97 W is obtained. This results in a compressed high power of 82.07 W with a power stability RMS of 0.09% and beam quality better than 1.2. Accurate dispersion control allows for the production of a high-quality pulse duration of 265 fs.

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Section: Introductionmentioning

confidence: 99%

High-Power GHz Burst-Mode All-Fiber Laser System with Sub 300 fs Pulse Duration

Li,

Zhao,

et al. 2024

Photonics

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“…The quantity of light incident in a hole diminishes as the depth of the hole increases, making the depth measuring of a blind hole in laser micromachining difficult with an eye-dependent measurement method such as an optical microscope. There is also a way of directly examining the cross-section of the blind hole by polishing [9], although objective depth measurement is problematic owing to grinding parameters. To objectively and accurately measure, numerous measuring tools and methodologies have been proposed [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Hole Depth Prediction in a Femtosecond Laser Drilling Process Using Deep Learning

et al. 2023

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In high-aspect ratio laser drilling, many laser and optical parameters can be controlled, including the high-laser beam fluence and number of drilling process cycles. Measurement of the drilled hole depth is occasionally difficult or time consuming, especially during machining processes. This study aimed to estimate the drilled hole depth in high-aspect ratio laser drilling by using captured two-dimensional (2D) hole images. The measuring conditions included light brightness, light exposure time, and gamma value. In this study, a method for predicting the depth of a machined hole by using a deep learning methodology was devised. Adjusting the laser power and the number of processing cycles for blind hole generation and image analysis yielded optimal conditions. Furthermore, to forecast the form of the machined hole, we identified the best circumstances based on changes in the exposure duration and gamma value of the microscope, which is a 2D image measurement instrument. After extracting the data frame by detecting the contrast data of the hole by using an interferometer, the hole depth was predicted using a deep neural network with a precision of within 5 μm for a hole within 100 μm.

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“…In recent years, Laser drilling is widely used in many neighborhoods as a controllable machining technology based on laser ablation [3]. Especially femtosecond laser processing has become one of the mainstream technologies for turbine-blade microhole processing due to its various advantages, such as being ultrafast and ultraintense as well as having a small heat-affected zone [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Validation of Multiscale 3D Laser Spiral Machining of Microholes

Dong

Li³

et al. 2022

Laser Part. Beams

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Femtosecond laser ablation is widely applied in high-precision machining of microholes in aeroengine turbine blades. To further explore the mechanism of action during the laser processing of microholes, numerical simulations were performed on the basis of a molecular dynamics (MD) method coupled with a two-temperature model (TTM). Laser irradiation on the surface of copper for different femtosecond-laser processing parameters is investigated in this work. Through the femtosecond-laser single-pulse central ablation simulation model, the laser energy flux density in a Gaussian laser spot range was discretized and analyzed to calculate the ablation depth at multiple points separately. The cross-sectional morphology of the femtosecond-laser single-pulse ablation pits was approximated and fitted. Finally, a 3D simulation model of the whole process of multiscale femtosecond-laser spiral processing microholes was established by superimposing multipulse femtosecond-laser spiral trajectories. This provides a theoretical basis for analyzing the evolution of geometric parameters and morphological characteristics of the hole during machining with specific laser and process parameters.

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Experimental investigation of femtosecond laser through-hole drilling of stainless steel with and without transverse magnetic assistance

Cited by 11 publications

References 45 publications

High-Power GHz Burst-Mode All-Fiber Laser System with Sub 300 fs Pulse Duration

High-Power GHz Burst-Mode All-Fiber Laser System with Sub 300 fs Pulse Duration

Hole Depth Prediction in a Femtosecond Laser Drilling Process Using Deep Learning

Numerical Simulation and Validation of Multiscale 3D Laser Spiral Machining of Microholes

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