Raman scattering has been studied in molecular media. The role of rotational levels has been investigated. It is shown that themolecular vibrational coherence stronglydepends on the effect of coherent population trapping for rotational levels. The obtained results are important for application of Raman spectroscopy to molecular detection for engineering, chemical, and biological applications.
{"title":"Suppression of coherent scattering by coherent population trapping on molecular vibrational levels","authors":"Pooja Singh","doi":"10.1515/COPH-2016-0003","DOIUrl":"https://doi.org/10.1515/COPH-2016-0003","url":null,"abstract":"Raman scattering has been studied in molecular media. The role of rotational levels has been investigated. It is shown that themolecular vibrational coherence stronglydepends on the effect of coherent population trapping for rotational levels. The obtained results are important for application of Raman spectroscopy to molecular detection for engineering, chemical, and biological applications.","PeriodicalId":317947,"journal":{"name":"Coherent Optical Phenomena","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123538059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ben Wu, M. P. Chang, Naomi R. Caldwell, M. Caldwell, P. Prucnal
We summarize the principle and experimental setup of optical steganography based on amplified spontaneous emission (ASE) noise. Using ASE noise as the signal carrier, optical steganography effectively hides a stealth channel in both the time domain and the frequency domain. Coherent detection is used at the receiver of the stealth channel. Because ASE noise has short coherence length and random phase, it only interferes with itself within a very short range. Coherent detection requires the stealth transmitter and stealth receiver to precisely match the optical delay, which generates a large key space for the stealth channel. Several methods to further improve optical steganography, signal to noise ratio, compatibilitywith the public channel, and applications of the stealth channel are also summarized in this review paper.
{"title":"Amplifier Noise Based Optical Steganography with Coherent Detection","authors":"Ben Wu, M. P. Chang, Naomi R. Caldwell, M. Caldwell, P. Prucnal","doi":"10.2478/COPH-2014-0003","DOIUrl":"https://doi.org/10.2478/COPH-2014-0003","url":null,"abstract":"We summarize the principle and experimental setup of optical steganography based on amplified spontaneous emission (ASE) noise. Using ASE noise as the signal carrier, optical steganography effectively hides a stealth channel in both the time domain and the frequency domain. Coherent detection is used at the receiver of the stealth channel. Because ASE noise has short coherence length and random phase, it only interferes with itself within a very short range. Coherent detection requires the stealth transmitter and stealth receiver to precisely match the optical delay, which generates a large key space for the stealth channel. Several methods to further improve optical steganography, signal to noise ratio, compatibilitywith the public channel, and applications of the stealth channel are also summarized in this review paper.","PeriodicalId":317947,"journal":{"name":"Coherent Optical Phenomena","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124791264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Increasing Photovoltaic Power by Noise Induced Coherence Between Intermediate Band States","authors":"K. Dorfman, A. Svidzinsky, M. Scully","doi":"10.2478/COPH-2013-0002","DOIUrl":"https://doi.org/10.2478/COPH-2013-0002","url":null,"abstract":"","PeriodicalId":317947,"journal":{"name":"Coherent Optical Phenomena","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131025429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Enhancing photocell power by noise-induced coherence","authors":"A. Svidzinsky, K. Dorfman, M. Scully","doi":"10.2478/COPH-2012-0002","DOIUrl":"https://doi.org/10.2478/COPH-2012-0002","url":null,"abstract":"","PeriodicalId":317947,"journal":{"name":"Coherent Optical Phenomena","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123399096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The linear and nonlinear behaviors of susceptibility via tunable Fano-type interference, based on intersubband transitions in asymmetric double quantum wells (QWs) driven coherently by a probe laser field, are analyzed. It is shown that Kerr nonlinearity can be controlled competently by tuning the energy splitting of the two excited states (the coupling strength of the tunneling), i.e. Fano-type interference. This outcome may be used for optimizing and controlling long wavelength optical switching processes in QW solid-state systems, which is much more useful than that currently used in atomic systems because of its flexible design and the controllable interference strength.
{"title":"Long wavelength enhanced Kerr nonlinearity via Fano-type interference in semiconductor quantum wells","authors":"S. H. Asadpour, H. Soleimani","doi":"10.2478/COPH-2012-0001","DOIUrl":"https://doi.org/10.2478/COPH-2012-0001","url":null,"abstract":"The linear and nonlinear behaviors of susceptibility via tunable Fano-type interference, based on intersubband transitions in asymmetric double quantum wells (QWs) driven coherently by a probe laser field, are analyzed. It is shown that Kerr nonlinearity can be controlled competently by tuning the energy splitting of the two excited states (the coupling strength of the tunneling), i.e. Fano-type interference. This outcome may be used for optimizing and controlling long wavelength optical switching processes in QW solid-state systems, which is much more useful than that currently used in atomic systems because of its flexible design and the controllable interference strength.","PeriodicalId":317947,"journal":{"name":"Coherent Optical Phenomena","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132656195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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