Ultrashort Pulse Laser Material Processing

Bliedtner, Jens; Schindler, Christian; Seiler, Michael; Wächter, Sebastian; Friedrich, Maria; Giesecke, Jan

doi:10.1002/latj.201600037

Cited by 18 publications

(7 citation statements)

References 4 publications

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“…An optimum processing window around 1 J/cm 2 was found for steel. Glasses require higher fluences ranging up to ∼ 30 J/cm 2 [5]. However, in alternative sequential processing strategies it might be beneficial to increase the removal rate via much higher fluences in a first roughing step.…”

Section: Introductionmentioning

confidence: 99%

X-ray emission as a potential hazard during ultrashort pulse laser material processing

et al. 2018

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In laser machining with ultrashort laser pulses unwanted X-ray radiation in the keV range can be generated when a critical laser intensity is exceeded. Even if the emitted X-ray dose per pulse is low, high laser repetition rates can lead to an accumulation of X-ray doses beyond exposure safety limits. For 925 fs pulse duration at a center wavelength of 1030 nm, the X-ray emission was investigated up to an intensity of 2.6 × 10 14 W/cm 2 . The experiments were performed in air with a thin disk laser at a repetition rate of 400 kHz. X-ray spectra and doses were measured for various planar target materials covering a wide range of the periodic table from aluminum to tungsten. Without radiation shielding, the measured radiation doses at this high repetition rate clearly exceed the regulatory limits. Estimations for an adequate radiation shielding are provided.

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Section: Introductionmentioning

confidence: 99%

X-ray emission as a potential hazard during ultrashort pulse laser material processing

et al. 2018

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“…The focusing of ultrashort laser pulses allows the machining of a large variety of materials down to a microscopic scale [1][2][3]. Non-contact, cold ablation enables the processing and manufacturing of work pieces without altering the surrounding material through excessive energy input, either through heat or through mechanical influences.…”

Section: Introductionmentioning

confidence: 99%

Intensity distribution on cylindrical surfaces in ultrashort pulse laser turning

Zettl,

Esen,

Hellmann

2024

Laser-Based Micro- And Nanoprocessing XVIII

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Tangential laser turning is applied to generate rotationally symmetric parts on a micrometer scale. Due to the non-contact material ablation, this process is especially advantageous for machining brittle materials such as stellite, which tends to easily break during conventional lathe. Furthermore, the use of focused ultrashort laser pulses enables the process to machine a large variety of materials because of the low heat input into the work piece.By impinging a cylindrical work piece laterally, a distortion of the projected circular, focused laser beam on the material surface occurs. In order to predict the actual fluence and intensity distribution on the rotating work piece, fundamental calculations and experimental results are necessary.Against this background, we report on laser turning of cylindrical components using ultrashort laser pulses with attention to the geometrical conditions and the resulting intensity distribution on the work piece. Particularly, the laser spot formation on a cylindrical surface at an oblique angle is discussed. In addition, the use of a trepanning optic in the laser turning process and the resulting beam path on the surface will be issued. The superimposed motion of the work piece rotation, trepanning rotation and linear laser feed rate is subject to fundamental calculations and experimental results.

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“…In recent years, the study of short laser pulses has become a sustained and attractive topic in the field of laser due to its extensive applications, such as industrial processing [1,2], medical surgery [3,4], optical surveying [5,6], optical communication [7,8] and scientific research [9,10]. This short laser pulses having pulse duration from microsecond to femtosecond can be generated by utilizing the Q-switching or mode-locking technique.…”

Section: Introductionmentioning

confidence: 99%

Utilization of group 10 2D TMDs-PdSe₂ as a nonlinear optical material for obtaining switchable laser pulse generation modes

et al. 2020

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In-plane anisotropic two-dimensional (2D) materials have gained considerable interest in the field of research, due to having the potential of being used in different device applications. Recently, among these 2D materials, group 10 transition metal dichalcogenides (TMDs) pentagonal Palladium diselenide (PdSe2) is utilized in various sections of researches like nanoelectronics, thermoelectric, spintronics, optoelectronics, and ultrafast photonics, owing to its high air stability and broad absorption spectrum properties. In this paper, it is demonstrated that by utilizing this novel 2D layered PdSe2 material as a saturable absorber (SA) in an EDF laser system, it is possible to obtain switchable laser pulse generation modes. At first, the Q-switching operation mode is attained at a threshold pump power of 56.8 mW at 1564 nm, where the modulation range of pulse duration and repetition rate is 18.5 μs–2.0 μs and 16.4 kHz–57.0 kHz, respectively. Afterward, the laser pulse generation mode is switched to the mode-locked state at a pump power of 63.1 mW (threshold value) by changing the polarization condition inside the laser cavity, and this phenomenon persists until the maximum pump power of 230.4 mW. For this mode-locking operation, the achieved pulse duration is 766 fs, corresponding to the central wavelength and 3 dB bandwidth of 1566 nm and 4.16 nm, respectively. Finally, it is illustrated that PdSe2 exhibits a modulation depth of 7.01%, which substantiates the high nonlinearity of the material. To the best of the authors’ knowledge, this is the first time of switchable modes for laser pulse generation are achieved by using this PdSe2 SA. Therefore, this work will encourage the research community to carry out further studies with this PdSe2 material in the future.

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Ultrashort Pulse Laser Material Processing

Cited by 18 publications

References 4 publications

X-ray emission as a potential hazard during ultrashort pulse laser material processing

X-ray emission as a potential hazard during ultrashort pulse laser material processing

Intensity distribution on cylindrical surfaces in ultrashort pulse laser turning

Utilization of group 10 2D TMDs-PdSe₂ as a nonlinear optical material for obtaining switchable laser pulse generation modes

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Ultrashort Pulse Laser Material Processing

Cited by 18 publications

References 4 publications

X-ray emission as a potential hazard during ultrashort pulse laser material processing

X-ray emission as a potential hazard during ultrashort pulse laser material processing

Intensity distribution on cylindrical surfaces in ultrashort pulse laser turning

Utilization of group 10 2D TMDs-PdSe2 as a nonlinear optical material for obtaining switchable laser pulse generation modes

Contact Info

Product

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Utilization of group 10 2D TMDs-PdSe₂ as a nonlinear optical material for obtaining switchable laser pulse generation modes