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

Li, Chiangxiu and Gusev, Vitalyi and Dimakis, Emmanouil and Dekorsy, Thomas (2019) Broadband Photo-Excited Coherent Acoustic Frequency Combs and Mini-Brillouin-Zone Modes in a MQW-SESAM Structure. Applied Sciences, 9 (2). Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/app9020289 ISSN 2076-3417

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Abstract

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.

Item URL in elib:https://elib.dlr.de/127235/
Document Type:Article
Title:Broadband Photo-Excited Coherent Acoustic Frequency Combs and Mini-Brillouin-Zone Modes in a MQW-SESAM Structure
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Li, ChiangxiuKonstanz University, Department of Physics and Applied OpticsUNSPECIFIED
Gusev, VitalyiLUNAM Universités, CNRS, Université du Maine, LAUM UMR-CNRS 6613, Av.O. Messiaen, 72085 Le Mans, FranceUNSPECIFIED
Dimakis, EmmanouilInstitute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum-Dresden-RossendorfUNSPECIFIED
Dekorsy, ThomasThomas.Dekorsy (at) dlr.dehttps://orcid.org/0000-0003-2257-2854
Date:2019
Journal or Publication Title:Applied Sciences
Refereed publication:No
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:9
DOI :10.3390/app9020289
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2076-3417
Status:Published
Keywords:coherent acoustic Phonons, pump-probe spectroscopy, Quantum well, semiconductor superlattice, high-speed asynchronous optical sampling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics
Deposited By: Heidenreich, Angela
Deposited On:14 May 2019 22:03
Last Modified:29 Jul 2019 09:44

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