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Tailoring Quantum Dot Saturable Absorber Mirrors for Ultra-Short Pulse Generation

Published online by Cambridge University Press:  01 February 2011

Matthew Lumb ,
Edmund Clarke ,
Dominic Farrell ,
Michael Damzen  and
Ray Murray
Matthew Lumb
Affiliation:
[email protected], Imperial College London, Department of Physics, The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BZ, United Kingdom, +44 (0)20 7594 7579, +44 (0)207 594 2077
Edmund Clarke
Affiliation:
[email protected], Imperial College London, EXSS Physics, The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BZ, United Kingdom
Dominic Farrell
Affiliation:
[email protected], Imperial College London, Photonics, The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BZ, United Kingdom
Michael Damzen
Affiliation:
[email protected], Imperial College London, Photonics, The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BZ, United Kingdom
Ray Murray
Affiliation:
[email protected], Imperial College London, EXSS Physics, The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BZ, United Kingdom
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Abstract

We have designed and grown a series of quantum dot semiconductor saturable absorber mirrors (QD-SESAMs) for a range of operating wavelengths, incorporating innovative design and processing features to optimise the device performance. Using a range of reflectivity studies, ellipsometric measurements and both time-integrated and time-resolved spectroscopic studies, we have conducted detailed investigations of device performance. Extensive modelling work of dielectric multilayers has been undertaken which supports our experimental findings and allows us to understand and design novel structures in order to improve and tailor device characteristics, including dielectric capping and non-normal incidence. We demonstrate samples designed for operation with the higher excited-states of the QDs which produced a self-starting train of mode-locked pulses with a temporal duration of 200 ps at a repetition rate of 78 MHz in a Nd:YVO4 solid-state laser. We also present SESAMs incorporating electronically coupled QD bilayers, allowing long wavelength operation.

Keywords

laserabsorptionoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1076: Symposium K – Materials and Devices for Laser Remote Sensing and Optical Communication , 2008 , 1076-K09-04
Copyright
Copyright © Materials Research Society 2008

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References

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