Results 261 to 270 of about 57,251 (307)

Intraocular microsurgery with a picosecond Nd:YAG laser

Lasers in Surgery and Medicine, 1994
AbstractWe investigated the use of picosecond Nd:YAG laser pulses for intraocular microsurgery. With a pulse duration of 100 picoseconds, only 70 μJ of pulse energy is required to consistently produce optical breakdown in the deep vitreous. This pulse energy is nearly two orders of magnitude less than the typical pulse energies used in conventional ...
C P, Lin, Y K, Weaver, R, Birngruber, J G, Fujimoto, C A, Puliafito   +4 more
openaire   +2 more sources

Evolution of the Picosecond Laser: A Review of Literature

Dermatologic Surgery, 2019
BACKGROUND Picosecond pulse duration lasers (PS) have altered the field of dermatology. PS were initially used in tattoo removal, to optimize efficacy and reduce side effects with nanosecond domain lasers. More recently, they have been demonstrated to be effective in the treatment of pigmentary disorders, acne scarring, and ...
Richard L, Torbeck, Laura, Schilling, Hooman, Khorasani, Jeffrey S, Dover, Kenneth A, Arndt, Nazanin, Saedi   +5 more
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Characterization of a picosecond CO_2 laser system

Applied Optics, 1985
The pulse duration of an optical free induction decay picosecond CO2 laser system was modeled and compared to autocorrelation measurements. Satisfactory agreement was obtained indicating that pulses as short as 20 psec were produced. The pulse duration can be continuously adjusted up to ∼200 psec by changing the CO2 gas pressure.
Sheik-Bahaei, M., Kwok, Hoi Sing
openaire   +3 more sources

Simple picosecond excimer laser system

Applied Optics, 1986
A method to generate a picosecond excimer laser pulse using a short-cavity dye laser is described.
K, Yamada, K, Miyazaki, T, Hasama, T, Sato   +3 more
openaire   +2 more sources

The use of picosecond lasers beyond tattoos

Journal of Cosmetic and Laser Therapy, 2016
Picosecond lasers are a novel laser with the ability to create a pulse of less than one nanosecond. They have been available in the clinical context since 2012. Dermatologists are now using picosecond lasers regularly for the treatment of blue and green pigment tattoo removal. This article reviews the use of picosecond lasers beyond tattoo removal. The
E, Forbat, F, Al-Niaimi
openaire   +2 more sources

Ultrastructure of Picosecond Laser Intrastromal Photodisruption

Journal of Refractive Surgery, 1996
ABSTRACT PURPOSE: To investigate the ultrastructure of the corneal stroma after picosecond intrastromal photodisruption with a neodymium-doped yttriumlithium-fluoride (Nd:YLF) laser. METHODS: We performed picosecond intrastromal photodisruption on six human eye-bank eyes using a lamellar technique.
R R, Krueger, A J, Quantock, T, Juhasz, M, Ito, K K, Assil, D J, Schanzlin   +5 more
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Laser picosecond acoustics in multilayer structures

Ultrasonics, 2002
The field of laser picosecond acoustics has thrived owing to the ease of detection of propagating picosecond acoustic pulses through changes in optical reflectance. Reflectance changes are caused by the inhomogeneous modulation of the refractive index by the propagating elastic strain through the photoelastic effect and also by the associated induced ...
O, Matsuda, O B, Wright
openaire   +2 more sources

Picosecond Laser Techniques

1978
In recent years, experimental investigations of vibrational relaxation processes have received increasing attention. Interesting information is obtained from the band shapes observed in infrared and Raman spectroscopy [1, 21. The interpretation of the measured lines is difficult, however, since several physical processes contribute in general to the ...
A. Laubereau, W. Kaiser
openaire   +1 more source

Laser processing of sapphire with picosecond and sub-picosecond pulses

Applied Surface Science, 1997
Abstract Laser processing of sapphire using a Ti:sapphire laser at 790 and 395 nm and pulse widths varying between 0.2 and 5 ps is reported. A clear improvement in quality is demonstrated for multi-shot processing with sub-ps laser pulses. For fluences between 3 and 12 J/cm 2 two ablation phases were observed, in agreement with previous work from ...
D Ashkenasi, A Rosenfeld, H Varel, M Wähmer, E.E.B Campbell   +4 more
openaire   +1 more source

Picosecond lasers: the next generation of short-pulsed lasers

Seminars in Cutaneous Medicine and Surgery, 2014
Selective photothermolysis, first discussed in the context of targeted microsurgery in 1983, proposed that the optimal parameters for specific thermal damage rely critically on the duration over which energy is delivered to the tissue. At that time, nonspecific thermal damage had been an intrinsic limitation of all commercially available lasers ...
Joshua R, Freedman, Joely, Kaufman, Andrea I, Metelitsa, Jeremy B, Green   +3 more
openaire   +2 more sources