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Chirped-pulse oscillators for the generation of high-energy femtosecond laser pulses

Published online by Cambridge University Press:  07 June 2005

ALEXANDER FUERBACH ,
A. FERNANDEZ ,
A. APOLONSKI ,
T. FUJI  and
F. KRAUSZ
ALEXANDER FUERBACH
Affiliation:
Femtolasers Produktions GmbH, Vienna, Austria
A. FERNANDEZ
Affiliation:
Photonics Institute, Christian Doppler Laboratory, Vienna University of Technology, Vienna, Austria
A. APOLONSKI
Affiliation:
Photonics Institute, Christian Doppler Laboratory, Vienna University of Technology, Vienna, Austria
T. FUJI
Affiliation:
Photonics Institute, Christian Doppler Laboratory, Vienna University of Technology, Vienna, Austria
F. KRAUSZ
Affiliation:
Photonics Institute, Christian Doppler Laboratory, Vienna University of Technology, Vienna, Austria
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Abstract

This paper reports on a novel approach for producing high energy femtosecond pulses without external amplification. The so-called chirped-pulse oscillator (CPO) concept is based on an extended-cavity oscillator, operating at small net positive intracavity group delay dispersion (GDD), over a broad spectral range by the use of chirped multilayer mirrors. The resultant chirped picosecond pulses are compressed by a dispersive delay line external to the laser cavity. Utilizing this technique, sub-30 fs pulses with an energy exceeding 200 nJ at a repetition rate of 11 MHz were produced. The demonstrated peak power in excess of 5 MW is the highest ever achieved from a cw-pumped laser and is expected to be scaleable to tens of megawatts by increasing the pump power and/or decreasing the repetition rate. The demonstrated source allows micromachining of any materials under relaxed focusing conditions.

Keywords

Ablation FieldFemtosecond laserFemtosecondMicromachiningUltrafast
Type
Research Article
Information
Laser and Particle Beams , Volume 23 , Issue 2 , June 2005 , pp. 113 - 116
Copyright
2005 Cambridge University Press

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