High aspect-ratio laser-drilling of micro-holes with a Nd:YAG master-oscillator power-amplifier (MOPA) system

Binder, Alexander; Metzger, Thomas; Ashkenasi, David; Müller, G.; Riesbeck, Thomas; Eichler, H. J.

doi:10.2351/1.5066156

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…In co-operation with the Institute for Optics at the Technical University of Berlin (TU Berlin), the Nd:YAG master oscillator power amplifier (MOPA) design is being permanently improved aiming at shorter pulse duration, higher average power and improved long-term stability [4] and [5]. The MOPA-layout is sketched in Fig.…”

Section: Master-oscillator Power-amplifier-systemmentioning

confidence: 99%

High-quality laser microdrilling of metals and ceramics with maximum aspect ratio

et al. 2003

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To meet the industry's demand for reducing machine cycle lengths concerning laser-drilling a Nd:YAG MasterOscillator Power-Amplifier (MOPA)-system was developed at the LMTB-laboratories that emits high-power peakpulses at excellent beam-quality. Presently, the output power of the oscillator (10W@1064nm) with a beam-quality of M²=1.3 is amplified to 95W@1064nm with M²=2.3 and a single pulse energy up to 500mJ. The pulse duration can be varied between 26 and 230ns. On account of the excellent beam quality, frequency conversion resulted in 49W@532nm and 4.8@266nm. The MOPA-System is used for laser micro drilling experiments into metals and ceramics where the influence of the beam quality on the geometrical shape of the hole is investigated and compared with applications conducted with similar laser systems. Additionally means in optimizing the drilling process such as burr-minimizing and melt-reduction were introduced. Furthermore, experiments using tapered drilling technique are undertaken. A maximum aspect ratio of 1:200 in stainless steel was obtained.

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Section: Master-oscillator Power-amplifier-systemmentioning

confidence: 99%

High-quality laser microdrilling of metals and ceramics with maximum aspect ratio

et al. 2003

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“…The new alternative to these conventional laser systems are much less researched pulsed Yb fiber lasers based on a master oscillator power amplifier (MOPA) architecture [1,2,37], which exhibit numerous superior characteristics, such as the flexibility in the control of a wide range of pulse durations and/or waveforms [37,39,40], allowing different processing operations to be performed with the same laser source. In this regard, their indispensability is already evident in the industrial applications of marking [41][42][43], removal of thin films (production of solar panels) [44,45], surface functionalization [46,47], engraving [48], drilling [49][50][51], cutting [52][53][54][55] and rapid prototyping [56]. They are also of general interest for use in many cases of microproduction [57][58][59], as they allow the formation of complex three-dimensional (3D) shapes in various industrially interesting materials, e.g., polymers, metals, ceramics, and organic materials [2].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Processing Parameters on the Laser-Ablation of Stainless Steel and Brass during the Engraving by Nanosecond Fiber Laser

et al. 2022

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In this paper, we investigate the influence of the following parameters: pulse duration, pulse repetition rate, line-to-line and pulse-to-pulse overlaps, and scanning strategy on the ablation of AISI 316L steel and CuZn37 brass with a nanosecond, 1064-nm, Yb fiber laser. The results show that the material removal rate (MRR) increases monotonically with pulse duration up to the characteristic repetition rate (f0) where pulse energy and average power are maximal. The maximum MRR is reached at a repetition rate that is equal or slightly higher as f0. The exact value depends on the correlation between the fluence of the laser pulses and the pulse repetition rate, as well as on the material properties of the sample. The results show that shielding of the laser beam by plasma and ejected material plays an important role in reducing the MRR. The surface roughness is mainly influenced by the line-to-line and the pulse-to-pulse overlaps, where larger overlap leads to lower roughness. Process optimization indicates that while operating with laser processing parameters resulting in the highest MRR, the best ratio between the MRR and surface roughness appears at ~50% overlap of the laser pulses, regardless of the material being processed.

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2009

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High aspect-ratio laser-drilling of micro-holes with a Nd:YAG master-oscillator power-amplifier (MOPA) system

Cited by 8 publications

References 2 publications

High-quality laser microdrilling of metals and ceramics with maximum aspect ratio

High-quality laser microdrilling of metals and ceramics with maximum aspect ratio

The Influence of the Processing Parameters on the Laser-Ablation of Stainless Steel and Brass during the Engraving by Nanosecond Fiber Laser

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