Design And Construction Of Regenerative

Topics: Laser, Optical cavity, Lasers Pages: 66 (17853 words) Published: December 4, 2014
D. Geskus

Design and construction of
regenerative amplifier and
compressor for chirped
pulse amplification

D. Geskus

Design and construction of
regenerative amplifier and
compressor for chirped
pulse amplification

University of Twente
Department of Science and Technology
Laser Physics and Non-linear Optics
Enschede, July 11, 2006
Graduation Committee:
Prof. Dr. K.J. Boller
Dr. Ir. F.A. van Goor
Prof. Dr. M. Pollnau
Dr. H.J.W.M. Hoekstra

Summary

Research on acceleration of electrons by plasma waves will be performed at the laser physics and non-linear optics group of the University of Twente to develop a new compact method for acceleration of electrons. This method of electron acceleration requires an intense ultrashort laser pulse to induce a plasma wave in the plasma on which the electrons can ”surf” to higher kinetic energies. Therefore, a laser is being developed that should deliver an 1 Joule laser pulse with a duration of 30 fs to generate the demanded 30 TW of optical power for creation of the plasma wave as required for this electron wake field acceleration experiment.

The principle of the laser is based on chirped pulse amplification; a stretched pulse is amplified to the demanded energy, and re-compressed afterwards. This report describes the performed work concerning the design and construction of a pre-amplifier and a compressor. For pre-amplification of the pulse a regenerative amplifier is used, which has been constructed and characterised. The measured output power of the regenerative amplifier is approximately 3.5 mJ, in the future this pulse will be further amplified by two additional multipass amplifiers. But as this further amplification is beyond the scope of this master thesis, it will not be treated in this report. A grating compressor with an efficiency of approximately 70%, recompresses the pre-amplified pulse to a duration of 29 fs with a pulse energy of the compressed pulse of 2.5 mJ. For creation of short pulses the dispersion of the optical system becomes very important. Because chirped pulse amplification is based on introducing dispersion in a controlled manner, it is of vital importance to fully comprehend these dispersive properties of the experimental set-up. Therefore, mathematical models have been successfully evaluated and the final output of the experimental set-up agrees very well to the results of the used mathematical models.

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CONTENTS

Preface

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1 Introduction
1.1 The laser physics group . . . . . . . . . . . . . . . . . . . . . . . 1.2 Acceleration of electrons . . . . . . . . . . . . . . . . . . . . . . . 1.3 Plasma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 University of Twente and the laser wake field acceleration demonstration experiment . . . . . . . . . . . . . . . . . . . . . . . . . .

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2 Laser system
2.1 Kerr lens modelocked laser
2.2 Stretcher . . . . . . . . . .
2.3 Regenerative amplifier . . .
2.4 Multi pass amplifier . . . .
2.5 Grating compressor . . . . .
2.6 Grenouille . . . . . . . . . .

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3 Pulse amplification in detail
3.1 Bandwidth of the regenerative amplifier . . . . . . . . . . . . . . 3.2 Analysis of beam propagation . . . . . . . . . . . . . . . . . . . . 3.2.1 Calculation of the beam properties by the resonator properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.2 Calculation of the beam properties with use of the (ABCD)Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.3...

Bibliography: Enschede, July 11, 2006
Dimitri Geskus
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