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Article

Broadband Photo-Excited Coherent Acoustic Frequency Combs and Mini-Brillouin-Zone Modes in a MQW-SESAM Structure

1
Department of Physics and Center of Applied Photonics, University of Konstanz, D-78457 Konstanz, Germany
2
LAUM, UMR-CNRS 6613, Le Mans Université, Avenue O. Messiaen, 72085 Le Mans, France
3
Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany
4
Institute for Technical Physics, German Aerospace Center (DLR), D-70569 Stuttgart, Germany
5
Research Center for Non-Destructive Testing GmbH, 4040 Linz, Austria
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(2), 289; https://doi.org/10.3390/app9020289
Received: 4 December 2018 / Revised: 6 January 2019 / Accepted: 8 January 2019 / Published: 15 January 2019
(This article belongs to the Special Issue Laser Ultrasonics)
A multiple quantum-well semiconductor saturable absorber mirror (MQW-SESAM) structure has been investigated by femtosecond pump-probe laser spectroscopy at a central wavelength of around 1050 nm. Coherent acoustic phonons are generated and detected over a wide frequency range from ~15 GHz to ~800 GHz. In the optical absorption region, i.e., in the multiple quantum wells (In0.27Ga0.73As), acoustic frequency combs centered at ~365 GHz, with a comb spacing of ~33 GHz, are generated. Most importantly, in the transparent region, i.e., in the distributed Bragg reflector, which is formed by a non-doped long-period semiconductor GaAs/Al0.95Ga0.05As superlattice, the mini-Brillouin-zone center, as well as zone-edge acoustic modes, are observed. The mini-zone-center modes with a fundamental frequency of 32 GHz can be attributed to the spatial modulation of the pump optical interference field with a period very close to that of the distributed Bragg reflector, in combination with the periodic spatial modulation of the electrostriction coefficient in the distributed Bragg reflector. The excitation of mini-zone-edge modes is attributed to the stimulated subharmonic decay of the fundamental center modes. Their subsequent back-folding to the mini-Brillouin-zone center makes them Raman active for the probe light. View Full-Text
Keywords: coherent acoustic phonons; pump-probe spectroscopy; quantum well; semiconductor superlattice; mini-Brillouin-zone; high-speed asynchronous optical sampling coherent acoustic phonons; pump-probe spectroscopy; quantum well; semiconductor superlattice; mini-Brillouin-zone; high-speed asynchronous optical sampling
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MDPI and ACS Style

Li, C.; Gusev, V.; Dimakis, E.; Dekorsy, T.; Hettich, M. Broadband Photo-Excited Coherent Acoustic Frequency Combs and Mini-Brillouin-Zone Modes in a MQW-SESAM Structure. Appl. Sci. 2019, 9, 289. https://doi.org/10.3390/app9020289

AMA Style

Li C, Gusev V, Dimakis E, Dekorsy T, Hettich M. Broadband Photo-Excited Coherent Acoustic Frequency Combs and Mini-Brillouin-Zone Modes in a MQW-SESAM Structure. Applied Sciences. 2019; 9(2):289. https://doi.org/10.3390/app9020289

Chicago/Turabian Style

Li, Changxiu, Vitalyi Gusev, Emmanouil Dimakis, Thomas Dekorsy, and Mike Hettich. 2019. "Broadband Photo-Excited Coherent Acoustic Frequency Combs and Mini-Brillouin-Zone Modes in a MQW-SESAM Structure" Applied Sciences 9, no. 2: 289. https://doi.org/10.3390/app9020289

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