Pulse Shaper Assisted Characterization of Single-cycle Optical Pulses

2009 ◽  
Author(s):  
Zhi-Ming Hsieh ◽  
Chien-Jen Lai ◽  
Wei-Hong Liang ◽  
Tsung-Ta Tang ◽  
Wei-Jan Chen ◽  
...  
Keyword(s):  
Pulse Shaper ◽  
Optical Pulses ◽  
Single Cycle

Amplitude and Phase Characterization of 5.0 fs Optical Pulses Using Spectral Phase Interferometry for Direct Electric-Field Reconstruction

2001 ◽  
Vol 40 (Part 2, No. 7A) ◽  
pp. L684-L687 ◽  
Author(s):  
Liming Li ◽  
Satoru Kusaka ◽  
Naoki Karasawa ◽  
Ryuji Morita ◽  
Hidemi Shigekawa ◽  
...  
Keyword(s):  
Electric Field ◽  
Spectral Phase ◽  
Optical Pulses ◽  
Field Reconstruction ◽  
Phase Characterization

Enzymatic properties of hepatitis C virus NS3-associated helicase

Microbiology ◽  
2000 ◽  
Vol 81 (5) ◽  
pp. 1335-1345 ◽  
Author(s):  
Chantal Paolini ◽  
Raffaele De Francesco ◽  
Paola Gallinari
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Rna Structure ◽  
Structural Protein ◽  
Single Cycle ◽  
Detailed Characterization ◽  
Stem Loop ◽  
Hybrid Substrates ◽  
Serine Protease Activity

The hepatitis C virus non-structural protein 3 (NS3) possesses a serine protease activity in the N-terminal one-third, whereas RNA-stimulated NTPase and helicase activities reside in the C-terminal portion. In this study, an N-terminal hexahistidine-tagged full-length NS3 polypeptide was expressed in Escherichia coli and purified to homogeneity by conventional chromatography. Detailed characterization of the helicase activity of NS3 is presented with regard to its binding and strand release activities on different RNA substrates. On RNA double-hybrid substrates, the enzyme was shown to perform unwinding activity starting from an internal ssRNA region of at least 3 nt and moving along the duplex in a 3′ to 5′ direction. In addition, data are presented suggesting that binding to ATP reduces the affinity of NS3 for ssRNA and increases its affinity for duplex RNA. Furthermore, we have ascertained the capacity of NS3 to specifically interact with and resolve the stem–loop RNA structure (SL I) within the 3′-terminal 46 bases of the viral genome. Finally, our analysis of NS3 processive unwinding under single cycle conditions by addition of heparin in both helicase and RNA-stimulated ATPase assays led to two conclusions: (i) NS3-associated helicase acts processively; (ii) most of the NS3 RNA-stimulated ATPase activity may not be directly coupled to translocation of the enzyme along the substrate RNA molecule.

scholarly journals Characterization of a high efficiency, ultrashort pulse shaper incorporating a reflective 4096-element spatial light modulator

2007 ◽  
Vol 278 (2) ◽  
pp. 368-376 ◽  
Author(s):  
Jeffrey J. Field ◽  
Thomas A. Planchon ◽  
Wafa Amir ◽  
Charles G. Durfee ◽  
Jeff A. Squier
Keyword(s):  
Ultrashort Pulse ◽  
Spatial Light Modulator ◽  
High Efficiency ◽  
Pulse Shaper ◽  
Light Modulator

Characterization of the train-average time–frequency parameters inherent in the low-power picosecond optical pulses generated by the actively mode-locked semiconductor laser with an external single-mode fiber cavity

Optik ◽  
2011 ◽  
Vol 122 (2) ◽  
pp. 136-141 ◽  
Author(s):  
Alexandre S. Shcherbakov ◽  
A.Yu. Kosarsky ◽  
Pedro Moreno Zarate ◽  
Joaquin Campos Acosta ◽  
Yurij V. Il’in ◽  
...  
Keyword(s):  
Low Power ◽  
Semiconductor Laser ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Optical Pulses ◽  
Time Frequency

Single-Cycle Optical Pulses from Coherently Combined Independent Mode-locked Lasers

2012 ◽  
Author(s):  
William P. Putnam ◽  
Jonathan A. Cox ◽  
Alexander Sell ◽  
Alfred Leitenstorfer ◽  
Franz X. Kärtner
Keyword(s):  
Optical Pulses ◽  
Single Cycle ◽  
Mode Locked Lasers ◽  
Independent Mode

Towards single-cycle optical pulses

2003 ◽  
Author(s):  
Franz X. Kaertner ◽  
Thomas R. Schibli ◽  
Jungwon Kim ◽  
Onur Kuzucu ◽  
Lia Matos ◽  
...  
Keyword(s):  
Optical Pulses ◽  
Single Cycle
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