LASIK operations with the Ziemer FEMTO LDV femtosecond laser flap creation after previous photorefractive keratometry or laser‐assisted sub‐epithelial keratomileusis

Pietilä, Juhani; Huhtala, Anne; Mäkinen, Petri; Uusitalo, Hannu

doi:10.1111/j.1755-3768.2012.02452.x

Cited by 4 publications

(2 citation statements)

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“…x-ray source [7,8] has become a research hotspot in the field of strong and ultrafast physics [9][10][11]. Thomson scattering is the elastic scattering of electromagnetic radiation by a free charged particle, and the x-rays produced by that are widely applied in modern astrophysics [12] and biomedicine [13,14].…”

Section: Introductionmentioning

confidence: 99%

Spatial radiation features of the off-axis collision between a relativistic electron and a tightly focused linearly polarized laser

Yang¹,

Wang²,

Cao³

et al. 2023

Laser Phys. Lett.

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The collision between relativistic electrons and a tightly focused linearly polarized laser pulse produced nonlinear inverse Thomson scattering (NITS), which generates backward x-rays. The effects of the initial transverse position of electrons with varied initial energy on the angular distribution of radiation power and spectrum are studied through numerical simulation. For the electrons with low initial energy (i.e. 2.56 MeV ), the off-axis collision breaks the spatial symmetry of x-ray radiation compared with the axial collision, the radiation direction is also torqued towards the same off-axis direction. There exists an optimal initial transverse position of electrons, which means the electron emitted from this position obtains greater radiation power. For the high-energy ( > 10 MeV ) electrons, the effect of torsion is not significant. The impact of off-axial is mainly manifested in the high-order harmonic spectrum. These findings help obtain high quality x-rays and modulate NITS radiation symmetry by electron parameters.

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Section: Introductionmentioning

confidence: 99%

Spatial radiation features of the off-axis collision between a relativistic electron and a tightly focused linearly polarized laser

Yang¹,

Wang²,

Cao³

et al. 2023

Laser Phys. Lett.

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“…Nonlinear Thomson scattering refers to the process that free electrons interact with intense lasers, which emits electromagnetic radiations (figure 1). Therefore, the application of nonlinear inverse Thomson scattering (NITS) as x-ray and γ-ray sources has become a research hotspot, and the rays are widely used in biomedicine 7,8 and nuclear physics 9 .…”

Section: Introductionmentioning

confidence: 99%

Symmetry of nonlinear inverse Thomson scattering with initial phase modulation of ultrashort circularly polarized laser

Yang,

Zhang,

Cao

et al. 2023

Eighteenth National Conference on Laser Technology and Optoelectronics

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Nonlinear inverse Thomson scattering (NITS) has gained many applications as premium x-ray sources, and is of great research values. Based on the classical theory of NITS, the effects of laser’s initial phase on NITS radiation are analyzed through numerical simulation when the relativistic electron collides with a circularly polarized ultrashort intense laser pulse. When pulse width of the laser is very short, the initial phase has a significant impact on the symmetry of electron’ trajectory and spatial radiation power, and the electrons’ trajectories show a ‘triple symmetry’ property with respect to the initial phase. The angular distribution of NITS radiation energy is generally circular, but there is a prominent single peak, which shows the high collimation. The direction and energy of the radiation peak can be modulated by initial phase periodically. Furthermore, the symmetry of radiate spatial spectrum varies with the change of initial phase, but the distribution pattern of the spectrum remains unchanged. Broad-band x-rays with different wavelength widths can be obtained at different positions in space. The findings above show that it is feasible to use initial phase of the laser to modulate the symmetry of the x-rays generated by NITS, which also provides a numerical basis for obtaining x-rays with different wavelength widths in practical experiments.

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Laser‐assisted in situ keratomileusis flap creation with the three‐dimensional, transportable Ziemer FEMTO LDV model Z6 I femtosecond laser

Pietilä

Huhtala²,

Mäkinen

et al. 2013

Acta Ophthalmologica

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ABSTRACT.Purpose: To present the outcomes of laser-assisted in situ keratomileusis (LASIK) operations performed with the new three-dimensional, transportable FEMTO LDV Z6 I femtosecond laser (Ziemer Ophthalmic Systems, Port, Switzerland) and the Allegretto Wave Concerto 500 Hz excimer laser (Wavelight AG, Erlangen, Germany) in terms of accuracy, reproducibility and safety of flap creation. Methods: This is a retrospective study of 309 consecutive eyes of 160 patients treated with the FEMTO LDV Z6 I for corneal flap creation. The target flap thickness was 90 lm. The size of the suction ring varied from 9.5 to 10.0 mm and target flap diameter from 9.3 to 9.6 mm, respectively. The target hinge length was 4.0 mm. Results: The FEMTO LDV Z6 I produced the 90-lm targeted flaps very consistently (mean 90.1 AE 2.7 lm, range 78-100). Mean flap diameter with the 9.3-mm target flap diameter was 9.3 AE 0.1 mm (range 9.0-9.6) and with the 9.6-mm target flap diameter 9.6 AE 0.1 mm (range 9.0-9.8). Mean hinge length was 3.9 AE 0.1 mm (range 3.3-4.2). Minor complications were reported in 15 (5%) eyes, but none of them prevented refractive laser treatment. The most common complications were bubbles in the conjunctiva (n = 7, 2%) and an opaque bubble layer inside the flap margin (n = 6, 2%). None of the eyes lost two Snellen lines of corrected distance visual acuity during 1-month follow-up. Conclusions: In the hands of an experienced surgeon, the transfer from the Classic FEMTO LDV to Z6 I was a safe and straight forward process yielding accurate and reproducible flaps.

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LASIK operations with the Ziemer FEMTO LDV femtosecond laser flap creation after previous photorefractive keratometry or laser‐assisted sub‐epithelial keratomileusis

Cited by 4 publications

References 4 publications

Spatial radiation features of the off-axis collision between a relativistic electron and a tightly focused linearly polarized laser

Spatial radiation features of the off-axis collision between a relativistic electron and a tightly focused linearly polarized laser

Symmetry of nonlinear inverse Thomson scattering with initial phase modulation of ultrashort circularly polarized laser

Laser‐assisted in situ keratomileusis flap creation with the three‐dimensional, transportable Ziemer FEMTO LDV model Z6 I femtosecond laser

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