scholarly journals Pulses on Demand in Fibre and Hybrid Lasers

2019 ◽  
Vol 65 (11-12) ◽  
pp. 680-689
Author(s):  
Rok Petkovšek ◽  
Vid Agrež ◽  
Jaka Petelin ◽  
Luka Černe ◽  
Udo Bünting ◽  
...  
Keyword(s):  
Gain Control ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Laser Source ◽  
Single Shot ◽  
Transfer Printing ◽  
On Demand ◽  
Laser Transfer ◽  
Hybrid Lasers ◽  
Fibre Amplifier

This paper presents an investigation of pulse-on-demand operation in fibre and hybrid lasers. Two methods for efficient gain control that enable the generation of laser pulses at arbitrary times with controlled pulse parameters are presented. The method of direct modulation of the pump power in the high-power laser oscillator is shown to generate pulses with a duration in the nanosecond range, with repetition rates varying during operation from a single shot to over 1 MHz. An advanced method using a combination of marker and idler seeding a fibre amplifier chain is investigated. Such a system can easily achieve repetition rates of several tens of MHz. The lasers’ performances were successfully tested in a real environment on an industrial platform for laser transfer printing. Similar concepts were used for a laser source with ultrashort laser pulses (femtosecond range) on demand by using a mode-locked seed as a source and a solid-state amplifier to achieve high pulse energy and peak power.

Single-shot diagnosing of spatiotemporal couplings in ultrashort laser pulses by spatiospectral imaging of a third-order nonlinear process

2020 ◽  
Vol 45 (8) ◽  
pp. 2207
Author(s):  
Margoto Jean-Baptiste ◽  
Cheng Zhao ◽  
Lopez-Martens Rodrigo ◽  
Oksenhendler Thomas
Keyword(s):  
Laser Pulses ◽  
Nonlinear Process ◽  
Ultrashort Laser Pulses ◽  
Single Shot ◽  
Third Order ◽  
Ultrashort Laser

scholarly journals Numerical modeling of laser ablation of materials

2020 ◽  
Vol 28 (4) ◽  
pp. 398-405
Author(s):  
Ilkizar V. Amirkhanov ◽  
Nil R. Sarker ◽  
Ibrohim Sarkhadov
Keyword(s):  
Laser Ablation ◽  
Moving Boundary ◽  
Laser Action ◽  
Laser Pulses ◽  
Sample Surface ◽  
Ultrashort Laser Pulses ◽  
Laser Source ◽  
Maximum Temperature ◽  
Conductivity Equation ◽  
Thermal Conductivity Equation

In this paper, we report a numerical simulation of laser ablation of a material by ultrashort laser pulses. The thermal mechanism of laser ablation is described in terms of a one-dimensional nonstationary heat conduction equation in a coordinate system associated with a moving evaporation front. The laser action is taken into account through the functions of the source in the thermal conductivity equation that determine the coordinate and time dependence of the laser source. For a given dose of irradiation of the sample, the profiles of the sample temperature at different times, the dynamics of the displacement of the sample boundary due to evaporation, the velocity of this boundary, and the temperature of the sample at the moving boundary are obtained. The dependence of the maximum temperature on the sample surface and the thickness of the ablation layer on the radiation dose of the incident laser pulse is obtained. Numerical calculations were performed using the finite difference method. The obtained results agree with the results of other works obtained by their authors.

Precise, real-time, every-single-shot, carrier-envelope phase measurement of ultrashort laser pulses

2010 ◽  
Vol 36 (1) ◽  
pp. 1 ◽  
Author(s):  
A. M. Sayler ◽  
Tim Rathje ◽  
Walter Müller ◽  
Klaus Rühle ◽  
R. Kienberger ◽  
...  
Keyword(s):  
Real Time ◽  
Phase Measurement ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Single Shot ◽  
Carrier Envelope Phase ◽  
Ultrashort Laser

Single-shot wave-front measurements of high-intensity ultrashort laser pulses with a three-wave interferometer

1998 ◽  
Vol 23 (8) ◽  
pp. 621 ◽  
Author(s):  
Jean-Christophe Chanteloup ◽  
Frédéric Druon ◽  
Marc Nantel ◽  
Anatoly Maksimchuk ◽  
Gérard Mourou
Keyword(s):  
Wave Front ◽  
High Intensity ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Single Shot ◽  
Ultrashort Laser

Single-shot ablation of sapphire by ultrashort laser pulses

2010 ◽  
Vol 101 (2) ◽  
pp. 279-282 ◽  
Author(s):  
Mehrnaz N. Christensen ◽  
Jeppe Byskov-Nielsen ◽  
Bjarke H. Christensen ◽  
Peter Balling
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Single Shot ◽  
Ultrashort Laser

WITHDRAWN: Single- shot pulse ablation of silicon by ultrashort laser pulses of varying width in air and water

2019 ◽  
Author(s):  
Nikita Smirnov ◽  
Sergey Kudryashov ◽  
Pavel Danilov ◽  
Alena Nastulyavichus ◽  
Andrey Rudenko ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Single Shot ◽  
Ultrashort Laser

scholarly journals Single-Shot Multi-Stage Damage and Ablation of Silicon by Femtosecond Mid-infrared Laser Pulses

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Kevin Werner ◽  
Vitaly Gruzdev ◽  
Noah Talisa ◽  
Kyle Kafka ◽  
Drake Austin ◽  
...  
Keyword(s):  
High Intensity ◽  
Ion Beam ◽  
Laser Pulses ◽  
Ultrafast Laser ◽  
Ex Situ ◽  
Laser Source ◽  
Oxide Surface ◽  
Single Shot ◽  
Mid Infrared ◽  
Laser Solid Interactions

AbstractAlthough ultrafast laser materials processing has advanced at a breakneck pace over the last two decades, most applications have been developed with laser pulses at near-IR or visible wavelengths. Recent progress in mid-infrared (MIR) femtosecond laser source development may create novel capabilities for material processing. This is because, at high intensities required for such processing, wavelength tuning to longer wavelengths opens the pathway to a special regime of laser-solid interactions. Under these conditions, due to the λ2 scaling, the ponderomotive energy of laser-driven electrons may significantly exceed photon energy, band gap and electron affinity and can dominantly drive absorption, resulting in a paradigm shift in the traditional concepts of ultrafast laser-solid interactions. Irreversible high-intensity ultrafast MIR laser-solid interactions are of primary interest in this connection, but they have not been systematically studied so far. To address this fundamental gap, we performed a detailed experimental investigation of high-intensity ultrafast modifications of silicon by single femtosecond MIR pulses (λ = 2.7–4.2 μm). Ultrafast melting, interaction with silicon-oxide surface layer, and ablation of the oxide and crystal surfaces were ex-situ characterized by scanning electron, atomic-force, and transmission electron microscopy combined with focused ion-beam milling, electron diffractometry, and μ-Raman spectroscopy. Laser induced damage and ablation thresholds were measured as functions of laser wavelength. The traditional theoretical models did not reproduce the wavelength scaling of the damage thresholds. To address the disagreement, we discuss possible novel pathways of energy deposition driven by the ponderomotive energy and field effects characteristic of the MIR wavelength regime.

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