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dc.contributor.author
Barh, Ajanta
dc.contributor.author
Heidrich, Jonas
dc.contributor.author
Alaydin, Behçet Ö.
dc.contributor.author
Gaulke, Marco
dc.contributor.author
Golling, Matthias
dc.contributor.author
Phillips, Christopher R.
dc.contributor.author
Keller, Ursula
dc.date.accessioned
2021-03-04T10:01:41Z
dc.date.available
2021-03-03T08:33:17Z
dc.date.available
2021-03-04T10:01:41Z
dc.date.issued
2021-02-15
dc.identifier.issn
1094-4087
dc.identifier.other
10.1364/OE.416894
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/472636
dc.description.abstract
Femtosecond lasers with high peak power at wavelengths above 2 µm are of high interest for generating mid-infrared (mid-IR) broadband coherent light for spectroscopic applications. Cr2+-doped ZnS/ZnSe solid-state lasers are uniquely suited since they provide an ultra-broad bandwidth in combination with watt-level average power. To date, the semiconductor saturable absorber mirror (SESAM) mode-locked Cr:ZnS(e) lasers have been severely limited in power due to the lack of suitable 2.4-µm SESAMs. For the first time, we develop novel high-performance 2.4-µm type-I and type-II SESAMs, and thereby obtain state-of-the-art mode-locking performance. The type-I InGaSb/GaSb SESAM demonstrates a low non-saturable loss (0.8%) and an ultrafast recovery time (1.9 ps). By incorporating this SESAM in a 250-MHz Cr:ZnS laser cavity, we demonstrate fundamental mode-locking at 2.37 µm with 0.8 W average power and 79-fs pulse duration. This corresponds to a peak power of 39 kW, which is the highest so far for any saturable absorber mode-locked Cr:ZnS(e) oscillator. In the same laser cavity, we could also generate 120-fs pulses at a record high average power of 1 W. A comparable laser performance is achieved using type-II InAs/GaSb SESAM as well. These results pave the way towards a new class of high-power femtosecond SESAM mode-locked oscillators operating directly above 2-µm wavelength. © 2021 Optical Society of America
en_US
dc.language.iso
en
en_US
dc.publisher
Optical Society of America
en_US
dc.title
Watt-level and sub-100-fs self-starting mode-locked 2.4-µm Cr:ZnS oscillator enabled by GaSb-SESAMs
en_US
dc.type
Journal Article
dc.date.published
2021-02-09
ethz.journal.title
Optics Express
ethz.journal.volume
29
en_US
ethz.journal.issue
4
en_US
ethz.journal.abbreviated
Opt. express
ethz.pages.start
5934
en_US
ethz.pages.end
5946
en_US
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2021-03-03T08:33:22Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-03-04T10:01:51Z
ethz.rosetta.lastUpdated
2021-03-04T10:01:51Z
ethz.rosetta.versionExported
true
ethz.COinS
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