Fabricating a regular hexagonal lattice structure by interference pattern of six femtosecond laser beams

2017 ◽  
Vol 417 ◽  
pp. 69-72 ◽  
Author(s):  
Yoshiki Nakata ◽  
Masataka Yoshida ◽  
Kazuhito Osawa ◽  
Noriaki Miyanaga
Keyword(s):  
Femtosecond Laser ◽  
Interference Pattern ◽  
Lattice Structure ◽  
Hexagonal Lattice ◽  
Laser Beams

Structural analysis of the photosynthetic membrane from Ectothiorhodospira halochloris

1983 ◽  
Vol 41 ◽  
pp. 740-741
Author(s):  
H. Engelhardt ◽  
R. Guckenberger ◽  
W. Baumeister
Keyword(s):  
Lattice Structure ◽  
Bacterial Species ◽  
Hexagonal Lattice ◽  
Reaction Centre ◽  
Photosynthetic Membrane ◽  
Rhodopseudomonas Viridis ◽  
Photosynthetic Membranes ◽  
Ectothiorhodospira Halochloris ◽  
Main Components

Bacterial photosynthetic membranes contain, apart from lipids and electron transport components, reaction centre (RC) and light harvesting (LH) polypeptides as the main components. The RC-LH complexes in Rhodopseudomonas viridis membranes are known since quite seme time to form a hexagonal lattice structure in vivo; hence this membrane attracted the particular attention of electron microscopists. Contrary to previous claims in the literature we found, however, that 2-D periodically organized photosynthetic membranes are not a unique feature of Rhodopseudomonas viridis. At least five bacterial species, all bacteriophyll b - containing, possess membranes with the RC-LH complexes regularly arrayed. All these membranes appear to have a similar lattice structure and fine-morphology. The lattice spacings of the Ectothiorhodospira haloohloris, Ectothiorhodospira abdelmalekii and Rhodopseudomonas viridis membranes are close to 13 nm, those of Thiocapsa pfennigii and Rhodopseudomonas sulfoviridis are slightly smaller (∼12.5 nm).

Temporally shaped Laguerre–Gaussian femtosecond laser beams

2018 ◽  
Vol 57 (13) ◽  
pp. 3624 ◽  
Author(s):  
Tom Bolze ◽  
Patrick Nuernberger
Keyword(s):  
Femtosecond Laser ◽  
Laser Beams

Maskless formation of uniform subwavelength periodic surface structures by double temporally-delayed femtosecond laser beams

2019 ◽  
Vol 471 ◽  
pp. 516-520 ◽  
Author(s):  
Sohail A. Jalil ◽  
Jianjun Yang ◽  
Mohamed ElKabbash ◽  
Subhash C. Singh ◽  
Chunlei Guo
Keyword(s):  
Femtosecond Laser ◽  
Surface Structures ◽  
Laser Beams ◽  
Periodic Surface

scholarly journals Stimulated Raman Microscopy Implemented by Three Femtosecond Laser Sources

2021 ◽  
Vol 255 ◽  
pp. 06003
Author(s):  
Rajeev Ranjan ◽  
Maria Antonietta Ferrara ◽  
Luigi Sirleto
Keyword(s):  
Femtosecond Laser ◽  
Stimulated Raman Scattering ◽  
Second Harmonic ◽  
Laser Beams ◽  
Raman Gain ◽  
Harmonic Generator ◽  
Second Harmonic Generator ◽  
Laser Sources ◽  
Fingerprint Region ◽  
Stimulated Raman

In this work, the implementation of a femtosecond Stimulated Raman Scattering microscope, equipped with three femtosecond laser sources: a Titanium-Sapphire (Ti:Sa), an optical parametric oscillator (OPO), and a second harmonic generator (SHG); is presented. Our microscope is designed so that it can cover all the regions of Raman spectra, taking advantage of two possible laser combinations. The first, Ti:Sa and OPO laser beams, which cover the C-H region (>2800 cm-1 ) in stimulated Raman gain (SRG) modality, whereas the second, Ti:Sa and SHG laser beams, covering the C-H region and the fingerprint region in stimulated Raman losses (SRL) modality. The successful realization of the microscope is demonstrated, reporting images of polystyrene beads using both SRL and SRG modalities.

Non-equilibrium heat transport of electron in Cu films irradiated by three femtosecond laser beams

2019 ◽  
Vol 48 (2) ◽  
pp. 206001
Author(s):  
许孝芳 Xu Xiaofang ◽  
李晓良 Li Xiaoliang ◽  
王庆伟 Wang Qingwei ◽  
杨逢逢 Yang Fengfeng ◽  
高永锋 Gao Yongfeng ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Heat Transport ◽  
Laser Beams ◽  
Cu Films ◽  
Non Equilibrium
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