نتایج جستجو برای: separate photorefractive soliton

تعداد نتایج: 146784  

Journal: :journal of current ophthalmology 0
مهرداد محمدپور mehrdad mohammadpour حسن هاشمی hassan hashemi محمود جباروند mahmoud jabbarvand فیروزه رحیمی firoozeh rahimi امیرهوشنگ بهشت نژاد amir houshang beheshtnejad محمدناصر هاشمیان mohammad naser hashemian محمدعلی زارع

purpose : to assess the safety, efficacy and predictability of photorefractive keratectomy (prk) [tissue-saving (ts) versus plano-scan (ps) ablation algorithms] of technolas 217z excimer laser for correction of myopic astigmatism methods : in this retrospective study one hundred and seventy eyes of 85 patients (107 eyes (62.9%) with ps and 63 eyes (37.1%) with ts algorithm) were included. ts al...

Journal: :Physical review letters 1996
Brubaker Wang Nolte Melloch

Intervalley scattering of hot electrons during high-field transport in transverse-field photorefractive quantum wells induces a nonlocal optical response in which photoinduced changes in the refractive index are spatially shifted relative to the optical stimulus, providing an avenue for optical gain. We demonstrate that the onset of the photorefractive phase shift coincides with the onset of ve...

2001
C. Weilnau W. Królikowski E. A. Ostrovskaya M. Ahles M. Geisser G. McCarthy C. Denz Y. S. Kivshar B. Luther-Davies

We review the generation of the recently predicted multi-component spatial optical solitons in a saturable nonlinear bulk medium. We present numerical simulations for an effectively isotropic model and experimental results for a set of different combinations of a Gaussian beam co-propagating incoherently with a beam of a more complex internal structure, such as a higher order transverse laser m...

Journal: :Optics and Photonics News 1993

2013
Sundeep Jolly James Barabas Daniel Smalley Michael Bove

We have previously introduced an architecture for updatable photorefractive holographic display based around direct fringe writing of computer-generated holographic fringe patterns. In contrast to interference-based stereogram techniques for hologram exposure in photorefractive polymer (PRP) materials, the direct fringe writing architecture simplifies system design, reduces system footprint and...

2016
Dahuai Zheng Yongfa Kong Shiguo Liu Muling Chen Shaolin Chen Ling Zhang Romano Rupp Jingjun Xu

For a long time that optical damage was renamed as photorefraction, here we find that the optical damage resistance and photorefraction can be simultaneously enhanced in MgO and Bi2O3 co-doped LiNbO3 (LN:Bi,Mg). The photorefractive response time of LN:Bi,Mg was shortened to 170 ms while the photorefractive sensitivity reached up to 21 cm(2)/J. Meanwhile, LN:Bi,Mg crystals could withstand a ligh...

Journal: :بینا 0
فرید کریمیان f karimian ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranتهران- پاسداران- بوستان نهم- خیابان پایدارفرد (خیابان امیر ابراهیمی)- پلاک 23- مرکز تحقیقات چشم حمیدرضا حسنی hr hasani ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranتهران- پاسداران- بوستان نهم- خیابان پایدارفرد (خیابان امیر ابراهیمی)- پلاک 23- مرکز تحقیقات چشم محمد آقازاده امیری m aghazade amiri ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranتهران- پاسداران- بوستان نهم- خیابان پایدارفرد (خیابان امیر ابراهیمی)- پلاک 23- مرکز تحقیقات چشم مهدی طباطبایی m tabatabayi دانشگاه علوم پزشکی تهران- دانشکده بهداشت و آمار نوشین دادبین n dadbin بیمارستان چشم پزشکی نگاه

purpose: to determine changes in streoacuity in anisometropic myopic eyes after photorefractive keratectomy (prk). methods: this quasi-experimental clinical trial was performed in myopic patients with at least 1 d of in anisometropia spherical, astigmatic or spherical equivalent who underwent photorefractive keratectomy (prk) using the technolas 217 z excimer laser machine. changes in streoacui...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2004
Nail Akhmediev J M Soto-Crespo

We have observed, in numerical simulations, strongly asymmetric soliton explosions in dissipative systems modeled by the one-dimensional complex cubic-quintic Ginzburg-Landau equation. The explosions occur at one side of the soliton, in spite of the fact that the initial conditions and the equation itself are symmetric. From one explosion to the next, the side of the soliton where it occurs alt...

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