Ultrafast lasers for high efficiency micromachining applications

Nov. 13, 2013
The EU collaborative project RAZipol will show laser material processing at new levels of productivity and precision material processing.

Stuttgart, Germany - High-precision laser micromachining has had such a big impact on daily life, its benefits and usefulness can often be taken for granted. For example, in the manufacture of smart phones, tablets, etc, high-precision laser micromachining is essential to produce some of the key features we use in these devices.

In the car industry, it is has been shown that diesel nozzles produced with ultrafast lasers lead to significantly reduced air pollution in comparison to nozzles produced with conventional fabrication techniques. Spinning nozzles used widely in the textile industry are also produced using ultrafast lasers.

The main goal of the EU collaborative project RAZipol (Ultrafast Lasers with Radial and Azimuthal Polarizations for High-efficiency Micro-machining Applications) is to demonstrate laser material processing at unprecedented levels of productivity (leading to drilling process times below 4 s of high aspect ratio 40:1 holes compared to current times of 25 s) and precision material processing (structure dimension below 1 micron) using beams with novel radial and azimuthal polarization.

The challenge is not only to achieve high productivity at moderate levels of precision or highest quality at low speeds, but to reach both targets at the same time. Therefore, an adequate ultrafast laser source with a very high average power and well-adapted beam parameters, including pulse duration, pulse energy, intensity profile, and polarization, is needed. Additionally, the laser beam has to be applied to the workpiece in a well-defined application-specific manner. Finally, advanced processing strategies are required to obtain optimum results at high productivity.

The ultrafast laser source planned for the RAZipol project combines several quite unique features. Its modular three-stage master oscillator power amplifier (MOPA) concept offers a high degree of flexibility to generate a broad range of pulse durations, pulse energies, and repetition rates. The MOPA combines an ultrafast oscillator together with a single crystal fiber as a first amplification stage and a thin-disk multipass amplifier as a final amplification stage.

Although the potential range of material processing applications for this laser source is extremely broad, the project will focus on two demonstration applications. The first application will be based on a fast scanner system that facilitates the production of complex structures like a "lab on a chip" on large wafers (8 in. diameter). For this application, the MOPA system providing up to 500 W average power will be set up for repetition rates in the 20-40 MHz range with pulse duration of approximately 1 ps.

The second application will be trepanning drilling of deep, high aspect holes with tight tolerances. In this case, the MOPA system providing up to 200 W average power will be set up for generating high pulse energies (≤ 1 mJ) at pulse duration of about 5 ps. It is believed that RAZipol will have a great impact on industrial fabrication since it targets cost-efficient solutions for a broad range of applications as well as fast and high-volume applications.

RAZipol has a total cost of $5,900,563; the EU contribution is $4,346,130. The project coordinator is the University of Stuttgart in Germany. Participants are GFH GmbH, Schweisstechnische Lehr- und Versuchsanstalt Slv Mecklenburg-Vorpommern, Class 4 Laser Professionals AG, Fibercryst SAS, Centre National de la Recherche Scientifique, Time-Bandwidth Products, and Next Scan Technology BV.

For further information, contact the administrator at the Instituitfuer Strahlwerkzeuge at the University of Stuttgart or go to Cordis Europa.

Sponsored Recommendations

Request a free Micro 3D Printed sample part

April 11, 2024
The best way to understand the part quality we can achieve is by seeing it first-hand. Request a free 3D printed high-precision sample part.

How to Tune Servo Systems: The Basics

April 10, 2024
Learn how to tune a servo system using frequency-based tools to meet system specifications by watching our webinar!

Motion Scan and Data Collection Methods for Electro-Optic System Testing

April 10, 2024
Learn how different scanning patterns and approaches can be used in measuring an electro-optic sensor performance, by reading our whitepaper here!

How Precision Motion Systems are Shaping the Future of Semiconductor Manufacturing

March 28, 2024
This article highlights the pivotal role precision motion systems play in supporting the latest semiconductor manufacturing trends.

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!