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/ | |||||||||||||||
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Document Type: | Article | |||||||||||||||
Title: | Broadband Photo-Excited Coherent Acoustic Frequency Combs and Mini-Brillouin-Zone Modes in a MQW-SESAM Structure | |||||||||||||||
Authors: |
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Date: | 2019 | |||||||||||||||
Journal or Publication Title: | Applied Sciences | |||||||||||||||
Refereed publication: | Yes | |||||||||||||||
Open Access: | Yes | |||||||||||||||
Gold Open Access: | Yes | |||||||||||||||
In SCOPUS: | Yes | |||||||||||||||
In ISI Web of Science: | Yes | |||||||||||||||
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 (old) | |||||||||||||||
Location: | Stuttgart | |||||||||||||||
Institutes and Institutions: | Institute of Technical Physics | |||||||||||||||
Deposited By: | Heidenreich, Angela | |||||||||||||||
Deposited On: | 14 May 2019 22:03 | |||||||||||||||
Last Modified: | 23 Jan 2020 16:11 |
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