Coupling efficiency of laser beam to multimode fiber

The coupling efficiency of laser beam to multimode fiber is given by geometrical optics, and the relation between the maximum coupling efficiency and the beam propagation factor M-2 is analyzed. An equivalent factor M-F(2) for the multimode fiber is introduced to characterize the fiber coupling capability. The coupling efficiency of laser beam to multimode fiber is calculated in respect of the ratio M-2/M-F(2) by the overlapping integral theory. The optimal coupling efficiency can be roughly estimated by the ratio of M-2 to M-F(2) but with a large error range. The deviation comes from the lacks of information on the detail of phase and intensity profile in the beam factor M-2. (C) 2007 Elsevier B.V. All rights reserved.

Spin squeezing, macrorealism and the heisenberg uncertainty principle

169 p.

Euskal herriko unibertsitatearen eragina spin-offen sortze- eta garapen-prozesuan

[EU]Enpresak sortzeko UPV/EHUko lehen programek eta programa horietatik sortutako lehen spin-offek hamabost urte baino gehiagoko ibilbidea egin dute jada. Denbora tarte horretan, hain zuzen, UPV/EHUtik hainbat spin-off sortu dira. Logikak agintzen duen moduan, enpresa bakoitzak garapen zehatza izan du, eta gaur egun bizi duen egoera bakarra da. Hala nola, enpresa bakoitzak unibertsitatearekin egun duen harremana ere desberdina da. Bada, ikerlan honen helburu nagusia da, alde batetik, UPV/EHUko egungo testuinguru ekintzailea aztertzea; eta bestetik, unibertsitateak spin-offen sorrera eta garapenean izan duen eragina ikertzea. Horretarako, enpresak sortzeko UPV/EHUko programaren baten babespean sortutako 40 spin-off aztertu dira, web formulario bidez bidalitako inkesta baten bitartez.

Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons

Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons from transversely polarized protons at the HERMES experiment. The asymmetries were studied as a function of the azimuthal angle psi about the beam direction between the target-spin direction and the hadron production plane, the transverse hadron momentum P-T relative to the direction of the incident beam, and the Feynman variable x(F). The sin psi* amplitudes are positive for pi(+) and K+ slightly negative for pi(-) and consistent with zero for K-, with particular P-T but weak x(F) dependences. Especially large asymmetries are observed for two small subsamples of events, where also the scattered electron was recorded by the spectrometer. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.

Spin orbitronics in metals

158 p.

Indoor air treatment by coupling biofiltration and adsortion

225 p.