Ultra high repetition rate (133 MHz) laser ablation of aluminum with 1.2-ps pulses

Lapczyna, Markus; Chen, K.P.; Herman, Peter R.; Tan, Hong; Marjoribanks, R. S.

doi:10.1007/s003390051552

Cited by 92 publications

(37 citation statements)

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“…However, it is compatible with burst-mode operation, using widely spaced bunches of ps pulses. This has been shown to improve the speed of material processing compared to the same energy delivered in an evenly spaced pulse train [15]. This mode of operation also has scientific uses such as for photo-injectors in large free-electron systems [16] and has been successfully demonstrated in high performance fiber laser systems [17].…”

Section: Simulationsmentioning

confidence: 99%

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Malinowski

Price

Zervas³

2015

IEEE J. Quantum Electron.

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Abstract-We propose a new tandem pumping scheme in threelevel rare-earth doped optical fibers where energy storage in a pump fiber laser enables much shorter (~500 ns) pump pulses than is possible with pulsed diode laser pumping. This has the effect of reducing the time during which the final amplifier has high inversion and hence reduces the ASE when compared to continuous wave (c.w.) tandem pumping. We simulate the gain and ASE dynamics in a pulse-pumped Yb-doped fiber amplifier and show that the ratio of amplified signal to ASE background can be improved by up to 2 orders of magnitude over a large range of pulse energies compared to c.w. tandem pumping. Sub-microsecond pulsed tandem pumping offers a relatively straightforward, as yet experimentally untried, way to substantially reduce undesirable ASE compared to the levels in diode-pumped fiber amplifiers.

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Section: Simulationsmentioning

confidence: 99%

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Malinowski

Price

Zervas³

2015

IEEE J. Quantum Electron.

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“…Tailoring ultrafast laser pulses is one of the key technologies to enhance the performance of ultrafast laser processing in terms of fabrication efficiency, quality, and resolution [131][132][133][134]. Spatial manipulation of laser pulses is effective to increase the fabrication speed, that is, increased throughput by multibeam parallel processing and enhancement of the laser energy utilization efficiency [135][136][137][138][139][140].…”

Section: Shaped Beam Processingmentioning

confidence: 99%

“…Similar behavior has also been observed by burst mode irradiation with ultrafast laser pulses (e.g., ca. 400 identical 1 ps pulses with a pulse separation of 7.5 ns), which allowed higher quality ablation with less microcracks and shock-induced effects than a single high-fluence laser pulse [132]. Very smooth holes with diameters of 7-10 µm and depths of ca.…”

Section: Temporal Shapingmentioning

confidence: 99%

Progress in ultrafast laser processing and future prospects

Sugioka

2017

Nanophotonics

180

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Abstract:The unique characteristics of ultrafast lasers have rapidly revolutionized materials processing after their first demonstration in 1987. The ultrashort pulse width of the laser suppresses heat diffusion to the surroundings of the processed region, which minimizes the formation of a heat-affected zone and thereby enables ultrahigh precision micro-and nanofabrication of various materials. In addition, the extremely high peak intensity can induce nonlinear multiphoton absorption, which extends the diversity of materials that can be processed to transparent materials such as glass. Nonlinear multiphoton absorption enables three-dimensional (3D) micro-and nanofabrication by irradiation with tightly focused femtosecond laser pulses inside transparent materials. Thus, ultrafast lasers are currently widely used for both fundamental research and practical applications. This review presents progress in ultrafast laser processing, including micromachining, surface micro-and nanostructuring, nanoablation, and 3D and volume processing. Advanced technologies that promise to enhance the performance of ultrafast laser processing, such as hybrid additive and subtractive processing, and shaped beam processing are discussed. Commercial and industrial applications of ultrafast laser processing are also introduced. Finally, future prospects of the technology are given with a summary.

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“…To overcome this bottleneck, we have implemented burst-mode operation, which was first demonstrated by R. Marjoribanks, et al using picosecond solid state lasers [1]. In burst mode, the laser produces packages of high-repetition-rate pulses, or bursts, which are repeated at a much lower, adjustable frequency.…”

mentioning

confidence: 99%

Ablation-cooled material removal at high speed with femtosecond pulse bursts

Kerse

Kalaycıoğlu

Elahi

et al. 2015

Advanced Solid State Lasers

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We report exploitation of ablation cooling, a concept well-known in rocket design, to remove materials, including metals, silicon, hard and soft tissue. Exciting possibilities include ablation using sub-microjoule pulses with efficiencies of 100-µJ pulses.OCIS codes: 140. 3390, 060.1510, 320.7090 Femtosecond pulses hold great promise for high-precision material and tissue processing. It is well-known that use of such pulse durations allows very precise and virtually thermal-damage free material removal under appropriate conditions. However, two drawbacks remain. The first is the limited ablation rates, which is particularly limiting for biological tissue removal. The second is that at several microjoules, but often 10's to 100's of microjoules of pulse energy are required. Regarding speed of ablation, the physics of the laser-material interaction precludes a straightforward scaling up of the removal rate simply by sending pulses more frequently, since this leads to collateral damage due to heat accumulation.Here, we exploit the same physics to circumvent this limitation. We apply rapid succession of ultrafast pulses from a burst-mode fibre laser to ablate the target before residual heat deposited by the previous pulse can diffuse away from the interaction region. In addition to being able to process thermally sensitive materials, such as brain tissue, at high speed and without thermal damage, our approach reduces the required pulse energy by orders of magnitude, opening the route to highly efficient material removal with oscillator-level pulse energies.For a long time, it was commonly assumed that heat effects are nearly completely eliminated through the use of ultrafast pulses. Heat damage can indeed occur during ultrafast pulse processing as a result of pulse-to-pulse accumulation of residual heat that is deposited around the border of the ablated region by each pulse. While deposition of some residual heat by each pulse is unavoidable, we present here a laser system that can catch much of this heat before it can diffuse beyond the volume to be ablated by the next incoming pulse by operating at very high repetition rates. This brings three interrelated advantages: (1) Most of the residual heat left by the previous pulse has not yet diffused out of the volume to be ablated by the next pulse. Thus, each pulse targets an already hot volume, which lowers the required ablation energy and peak power with numerous side benefits, such minimizing plasma shielding, reducing shock wave, cavitation bubble formation and self-focusing. In addition, the quantity of residual heat is proportional to the pulse energy, thus reducing the magnitude of the problem to be solved. (3) Finally and most importantly, much of this residual heat is then carried away from the tissue in the form of ablated matter when ablated by the next pulse, reducing the build-up of heat from pulse to pulse. This is known as ablation cooling, which is very well known in the context of atmospheric entry of meteorites or reusable space rockets ...

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Ultra high repetition rate (133 MHz) laser ablation of aluminum with 1.2-ps pulses

Cited by 92 publications

References 0 publications

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Progress in ultrafast laser processing and future prospects

Ablation-cooled material removal at high speed with femtosecond pulse bursts

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