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Proceedings Paper

Temporal pulse shaping using fiber laser technology: nanoscaling for flexible industrial laser material processing
Author(s): Rajesh S. Patel; Michelle Lynn Stock; Zaza Sartania; Jim M. Bovatsek; Alan Y. Arai; Heinrich Endert
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Paper Abstract

On the basis of highly efficient Yb:fiber amplifiers, a new technology platform for compact and nearly maintenance-free laser sources from the femtosecond to the nanosecond time scale has been developed, allowing their application-customized use in industrial laser material processing. The core of this technology is the patented use of multimode fibers with TEM00 output characteristics, enabling high and efficient amplification while maintaining high quality of the output beam. First, we review the fiber laser amplifier developments in the femtosecond pulse regime. Then, we present for the first time a picosecond seed source, Yb fiber amplifier laser design. Next, we present a completely new laser seeder/amplifier design, enabling online temporal tuning of laser pulses between 4 and 20 ns without changing pulse energy by utilizing high-speed control circuitry to adjust pulse duration, repetition rate and pulse energy independently. Pulse length can be optimized to process a given dimension of a sample structure that needs to be modified. Pulse shape can be controlled to produce almost rectangular pulses with <1.5 ns rise times. The resultant pulses can be transported by a polarization-maintaining delivery fiber for easy integration and use in material processing applications. Finally, we describe a few examples of micromachining using pulses from this new, flexible, fiber-based nanosecond laser source.

Paper Details

Date Published: 19 February 2003
PDF: 5 pages
Proc. SPIE 4830, Third International Symposium on Laser Precision Microfabrication, (19 February 2003); doi: 10.1117/12.486528
Show Author Affiliations
Rajesh S. Patel, IMRA America, Inc. (United States)
Michelle Lynn Stock, IMRA America, Inc. (United States)
Zaza Sartania, IMRA America, Inc. (United States)
Jim M. Bovatsek, IMRA America, Inc. (United States)
Alan Y. Arai, IMRA America, Inc. (United States)
Heinrich Endert, IMRA America, Inc. (United States)


Published in SPIE Proceedings Vol. 4830:
Third International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Kojiro F. Kobayashi; Koji Sugioka; Reinhart Poprawe; Henry Helvajian, Editor(s)

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