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Conference Paper: Real-time characterization of spectral coherence of ultrafast laser based on optical time-stretch

TitleReal-time characterization of spectral coherence of ultrafast laser based on optical time-stretch
Authors
KeywordsCorrelation map
Phase
Spectral coherence
Ultrafast measurement
Issue Date2016
PublisherSPIE - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml?WT.svl=mddp2
Citation
Real-Time Measurements, Rogue Events, and Emerging Applications, San Francisco, CA., 15-16 February 2016. In Conference Proceedings, 2016, v. 9732, article no. 97320C How to Cite?
AbstractNonlinearly generated broadband ultrafast laser have been increasingly utilized in many applications. However, traditional techniques of characterizing these sources lack the ability to observe the instantaneous features and transitory behaviours of both amplitude and phase. With the advent of the optical time stretch techniques, the instantaneous shotto- shot spectral intensity can be directly measured continuously at an unprecedentedly high speed. Meanwhile, the information of the real-time phase variation, which is carried by the frequency-time mapped spectral signal has yet been fully explored. We present a technique of experimentally measuring the spectral coherence dynamics of broadband pulsed sources. Our method relies on a delayed Young's type interferometer combined with optical time-stretch. We perform the proof-of-principle demonstrations of spectral coherence dynamics measurement on two sources: a supercontinuum source and a fiber ring buffered cavity source, both with a repetition rate of MHz. By employing the optical time stretch with a dispersive fiber, we directly map the spectral interference fringes of the delayed neighbouring pulses and obtain a sufficiently large ensemble of spectral interferograms with a real-time oscilloscope (80Gb/s sampling rate). This enables us to directly quantify the spectral coherence dynamics of the ultrafast sources with a temporal resolution down to microseconds. Having the ensemble of single-shot interferograms, we also further calculate the cross spectral coherence correlation matrices of these ultrafast sources. We anticipate that our technique provides a general approach for experimentally evaluating the spectral coherence dynamics of ultrafast laser generated by the nonlinear processes e.g. modulation instability, supercontinuum generation, and Kerr resonator. © 2016 SPIE.
Persistent Identifierhttp://hdl.handle.net/10722/234154
ISBN
ISSN

 

DC FieldValueLanguage
dc.contributor.authorXu, Y-
dc.contributor.authorWei, X-
dc.contributor.authorRen, Z-
dc.contributor.authorWong, KKY-
dc.contributor.authorTsia, KKM-
dc.date.accessioned2016-10-14T06:59:24Z-
dc.date.available2016-10-14T06:59:24Z-
dc.date.issued2016-
dc.identifier.citationReal-Time Measurements, Rogue Events, and Emerging Applications, San Francisco, CA., 15-16 February 2016. In Conference Proceedings, 2016, v. 9732, article no. 97320C-
dc.identifier.isbn978-162841967-2-
dc.identifier.issn0277-786X-
dc.identifier.urihttp://hdl.handle.net/10722/234154-
dc.description.abstractNonlinearly generated broadband ultrafast laser have been increasingly utilized in many applications. However, traditional techniques of characterizing these sources lack the ability to observe the instantaneous features and transitory behaviours of both amplitude and phase. With the advent of the optical time stretch techniques, the instantaneous shotto- shot spectral intensity can be directly measured continuously at an unprecedentedly high speed. Meanwhile, the information of the real-time phase variation, which is carried by the frequency-time mapped spectral signal has yet been fully explored. We present a technique of experimentally measuring the spectral coherence dynamics of broadband pulsed sources. Our method relies on a delayed Young's type interferometer combined with optical time-stretch. We perform the proof-of-principle demonstrations of spectral coherence dynamics measurement on two sources: a supercontinuum source and a fiber ring buffered cavity source, both with a repetition rate of MHz. By employing the optical time stretch with a dispersive fiber, we directly map the spectral interference fringes of the delayed neighbouring pulses and obtain a sufficiently large ensemble of spectral interferograms with a real-time oscilloscope (80Gb/s sampling rate). This enables us to directly quantify the spectral coherence dynamics of the ultrafast sources with a temporal resolution down to microseconds. Having the ensemble of single-shot interferograms, we also further calculate the cross spectral coherence correlation matrices of these ultrafast sources. We anticipate that our technique provides a general approach for experimentally evaluating the spectral coherence dynamics of ultrafast laser generated by the nonlinear processes e.g. modulation instability, supercontinuum generation, and Kerr resonator. © 2016 SPIE.-
dc.languageeng-
dc.publisherSPIE - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml?WT.svl=mddp2-
dc.relation.ispartofSPIE - International Society for Optical Engineering. Proceedings-
dc.rightsSPIE - International Society for Optical Engineering. Proceedings. Copyright © S P I E - International Society for Optical Engineering.-
dc.rightsCopyright 2016. Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.-
dc.subjectCorrelation map-
dc.subjectPhase-
dc.subjectSpectral coherence-
dc.subjectUltrafast measurement-
dc.titleReal-time characterization of spectral coherence of ultrafast laser based on optical time-stretch-
dc.typeConference_Paper-
dc.identifier.emailWei, X: xmwei@hku.hk-
dc.identifier.emailWong, KKY: kywong@eee.hku.hk-
dc.identifier.emailTsia, KKM: tsia@hku.hk-
dc.identifier.authorityWong, KKY=rp00189-
dc.identifier.authorityTsia, KKM=rp01389-
dc.identifier.doi10.1117/12.2211969-
dc.identifier.scopuseid_2-s2.0-84982176789-
dc.identifier.hkuros267560-
dc.identifier.volume9732, article no. 97320C-
dc.publisher.placeUnited States-
dc.customcontrol.immutablesml 161111-

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