Topical Meeting on Ultrafast Phenomena最新文献

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Ultracoherent Transient Spectroscopy 超相干瞬态光谱学
Topical Meeting on Ultrafast Phenomena Pub Date : 2008-06-05 DOI: 10.1063/1.35711
W. Warren, J. Bates
{"title":"Ultracoherent Transient Spectroscopy","authors":"W. Warren, J. Bates","doi":"10.1063/1.35711","DOIUrl":"https://doi.org/10.1063/1.35711","url":null,"abstract":"A major and ongoing focus of our research effort has been the development of laser pulse sequences analogous to those used in nuclear magnetic resonance, to study relaxation phenomena in condensed phases. Sequences of multiple rectangular 90° and 180° pulses with various phases have been used extensively in high resolution and solid state NMR for nearly three decades, and have been shown to enhance forbidden transitions, selectively refocus some intermolecular interactions, or even increase physiological image contrast for tumor identification. By contrast, the conventional approach to optical coherent transient spectroscopy (splitting a single high power pulse into several parts) generates pulse sequences with well defined delays, but generally totally unknown phases; in addition, the pulse shape is not easily controlled. This approach has proven extremely useful in the past, particularly if noncollinear pulses are used to exploit propagation effects, but growing recognition of the fundamental complexity of condensed phase relaxation processes (and the defects of a two-level approximation) reveals a fundamental need for a more powerful approach.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"33 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131804216","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}
引用次数: 0
Picosecond Optoelectronic Sampling of Electrical Waveforms Produced by an Optically Excited Field Effect Transistor 由光激发场效应晶体管产生的电信号的皮秒光电采样
Topical Meeting on Ultrafast Phenomena Pub Date : 1987-12-01 DOI: 10.1007/978-3-642-82918-5_33
S. Moss
{"title":"Picosecond Optoelectronic Sampling of Electrical Waveforms Produced by an Optically Excited Field Effect Transistor","authors":"S. Moss","doi":"10.1007/978-3-642-82918-5_33","DOIUrl":"https://doi.org/10.1007/978-3-642-82918-5_33","url":null,"abstract":"","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133753756","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}
引用次数: 3
Picosecond Photoluminescence and Energy-Loss Rates in GaAs Quantum Wells under High-Density Excitation 高密度激发下GaAs量子阱的皮秒光致发光和能量损失率
Topical Meeting on Ultrafast Phenomena Pub Date : 1987-08-01 DOI: 10.1063/1.339757
H. Uchiki, Takayoshi Kobayashi, H. Sakaki
{"title":"Picosecond Photoluminescence and Energy-Loss Rates in GaAs Quantum Wells under High-Density Excitation","authors":"H. Uchiki, Takayoshi Kobayashi, H. Sakaki","doi":"10.1063/1.339757","DOIUrl":"https://doi.org/10.1063/1.339757","url":null,"abstract":"Several features of the luminescence from the GaAs/AlGaAs semiconductors with quantum well structures have been extensively studied. Among the features studied the relaxation mechanism of hot carriers in quantum wells are still controversial among the studies at the present stage. The investigation of the relaxation process must be performed in order to clarify the essential mechanisms of excellent characteristics of laser oscillation such as the reduction of threshold current and the control of lasing over wide wavelength region.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123353292","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}
引用次数: 12
High Speed Circuit Measurements Using Photoemission Sampling 利用光电采样的高速电路测量
Topical Meeting on Ultrafast Phenomena Pub Date : 1986-09-12 DOI: 10.1063/1.97179
J. Bokor, A. Johnson, R. Storz
{"title":"High Speed Circuit Measurements Using Photoemission Sampling","authors":"J. Bokor, A. Johnson, R. Storz","doi":"10.1063/1.97179","DOIUrl":"https://doi.org/10.1063/1.97179","url":null,"abstract":"We report the development of a new technique for measurement of high speed signals in electronic devices. The method is based on the energy analysis of electrons emitted from the surface of a metallization line on the device by multiphoton photoelectric effect in vacuum using a low powered, cw mode-locked laser source. Changes in the potential of the surface give rise to shifts in the photoemitted electron energies, which can be measured using a simple, retarding field electron energy analyzer. Since the method involves the direct measurement of voltage on a metal line, it can be used on any type of electronic device, regardless of the electronic material being used to fabricate the device. Furthermore, the opacity of the metal eliminates the possibility of perturbation of device performance by absorption of the laser radiation in the semiconductor.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117138440","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}
引用次数: 21
Picosecond Pulse Amplification Using Pulse Compression Techniques 使用脉冲压缩技术的皮秒脉冲放大
Topical Meeting on Ultrafast Phenomena Pub Date : 1986-06-09 DOI: 10.1364/CLEO.1986.THL1
D. Strickland, P. Maine, M. Bouvier, S. Williamson, G. Mourou
{"title":"Picosecond Pulse Amplification Using Pulse Compression Techniques","authors":"D. Strickland, P. Maine, M. Bouvier, S. Williamson, G. Mourou","doi":"10.1364/CLEO.1986.THL1","DOIUrl":"https://doi.org/10.1364/CLEO.1986.THL1","url":null,"abstract":"Nd:Glass amplifiers have very good energy storage capabilities, but, the energy extraction is extremely inefficient for short pulse amplification. Scientists working in the radar field overcame similar peak power limitations by first chirping and stretching the pulse prior to amplification.1-2 By amplifying the longer pulses, much higher energies could be achieved. The echo was then compressed to a pulsewidth approximately equal to 1/Δf, where Δf is the total frequency chirp.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133040751","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}
引用次数: 4
Femtosecond Carrier Relaxation In Semiconductor-Doped Glasses 半导体掺杂玻璃中的飞秒载流子弛豫
Topical Meeting on Ultrafast Phenomena Pub Date : 1986-06-09 DOI: 10.1063/1.97225
M. Nuss, W. Zinth, W. Kaiser
{"title":"Femtosecond Carrier Relaxation In Semiconductor-Doped Glasses","authors":"M. Nuss, W. Zinth, W. Kaiser","doi":"10.1063/1.97225","DOIUrl":"https://doi.org/10.1063/1.97225","url":null,"abstract":"Semiconductor-doped glasses, incorporating small CdSxSe1–x or CdSexTe1–x crystallites in a glass matrix, show strong nonlinear absorption1 and large values of the nonlinear optical susceptibility χ8 have been reported in recent degenerate-four-wave-mixing experiments2. This nonlinearity has been attributed to the generation of a dense electron-hole plasma in the semiconductor crystallites.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116362256","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}
引用次数: 108
Picosecond Excite-Probe and Transient Grating Studies of GaInAsP GaInAsP的皮秒激发探针和瞬态光栅研究
Topical Meeting on Ultrafast Phenomena Pub Date : 1986-06-09 DOI: 10.1364/up.1986.me1
R. Manning, A. Miller, A. M. Fox, J. Marsh
{"title":"Picosecond Excite-Probe and Transient Grating Studies of GaInAsP","authors":"R. Manning, A. Miller, A. M. Fox, J. Marsh","doi":"10.1364/up.1986.me1","DOIUrl":"https://doi.org/10.1364/up.1986.me1","url":null,"abstract":"We have previously reported ultrafast saturation recovery in 0.860 eV (1.45 μm) bandgap GaxIn1–xAsyP1-y (x = 0.35, y = 0.78) [1], at high carrier densities (> l019 cm–3) using 5 psec pulses at 1.054 μm (1.176 eV). The extremely rapid (~ 10 psec) recovery was attributed to Auger recombination, and was consistent with values for the Auger coefficient measured by Sermage et al [2] at lower carrier densities, and subsequently by Wintner and Ippen [3]. Recently Islam et al [4] have carried out 2-pulse grating measurements on GaInAsP. This paper extends these studies to the 3-pulse transient grating technique with samples having different bandgap energies.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116553259","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}
引用次数: 0
Fluctuations and Chirp in Colliding Pulse Mode-Locked Dye Lasers 碰撞脉冲锁模染料激光器中的波动和啁啾
Topical Meeting on Ultrafast Phenomena Pub Date : 1986-06-09 DOI: 10.1364/CLEO.1986.THR2
D. Kühlke, T. Bonkhofer, U. Herpers, D. Linde
{"title":"Fluctuations and Chirp in Colliding Pulse Mode-Locked Dye Lasers","authors":"D. Kühlke, T. Bonkhofer, U. Herpers, D. Linde","doi":"10.1364/CLEO.1986.THR2","DOIUrl":"https://doi.org/10.1364/CLEO.1986.THR2","url":null,"abstract":"To ensure the shortest possible pulse duration in passively mode-locked dye lasers intracavity self-phase modulation (SPM) and phase dispersion (PD) must be properly balanced /1,2/. SPM is caused mainly by time-dependent saturation of the bleachable absorber /3/, and also by the Kerr-type nonlinearity of the index of refraction of the dye solvent. So far very little attention has been paid to the interrelation between SPM an PD effects and the noise properties of the pulses. We believe that consideration of pulse fluctuations is essential because in almost any conceivable application the noise of the pulses will be a matter of concern. Also the noise behavior provides interesting insight into the pulse forming and pulse evolution mechanisms.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134359687","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}
引用次数: 0
Dispersion Compensated Fiber Raman Oscillator 色散补偿光纤拉曼振荡器
Topical Meeting on Ultrafast Phenomena Pub Date : 1986-06-09 DOI: 10.1007/978-3-642-82918-5_15
J. Kafka, T. Baer, D. F. Head
{"title":"Dispersion Compensated Fiber Raman Oscillator","authors":"J. Kafka, T. Baer, D. F. Head","doi":"10.1007/978-3-642-82918-5_15","DOIUrl":"https://doi.org/10.1007/978-3-642-82918-5_15","url":null,"abstract":"","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122987763","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}
引用次数: 2
Fast Sampling of Atomic Velocities by Incoherent Light Stimulated Photon Echoes 非相干光激发光子回波对原子速度的快速采样
Topical Meeting on Ultrafast Phenomena Pub Date : 1986-02-01 DOI: 10.1364/up.1986.tue7
M. Defour, J. Keller, J. L. Gouët
{"title":"Fast Sampling of Atomic Velocities by Incoherent Light Stimulated Photon Echoes","authors":"M. Defour, J. Keller, J. L. Gouët","doi":"10.1364/up.1986.tue7","DOIUrl":"https://doi.org/10.1364/up.1986.tue7","url":null,"abstract":"It has been recently pointed out that incoherent light can be used to generate coherent optical transients and that there are decided advantages in using such broad-band non-laser source to achieve very high time resolution {1,2}. When a light pulse and its time-delayed replica interact with a sample to produce the non-linear optical response, the ultimate time resolution should identify with the correlation time τC of the light field rather than with the pulse duration τL. The situation where τC ≪ τL is easily obtained with broad-band incoherent light sources. Time resolution in the femtosecond range is then attainable using nanosecond light pulses. This has been recently demonstrated through the observation of the relaxation of photon echoes in Nd3+-doped silicate glass {1,2}. In these cases, attention is focused on the measurement of fast homogeneous decay rates and the inhomogeneous broadening ΩD is assumed to be much larger than the spectral width of the excitation light.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122565881","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}
引用次数: 0
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