Results 161 to 170 of about 1,870,110 (224)

Three‐Year Results of Facial Photoaging in Asian Patients After Alexandrite 755 nm Picosecond Laser With Diffractive Lens Array: A Split‐Face, Single‐Blinded, Randomized Controlled Comparison

Lasers in Surgery and Medicine, 2021
The long‐term efficacy of a picosecond alexandrite laser (PSAL) with a diffractive lens array (DLA) for the treatment of photoaging is absent. To observe the long‐term efficacy of PSAL for the treatment of photoaging.
Wenyou Yu, Jiafang Zhu, Wenxin Yu, Ying Shang, Dongze Lyu, Xiaoxi Lin, Hui Xu, Zhen Zhang   +7 more
semanticscholar   +1 more source

Diffractive Alvarez lens

Optics Letters, 2000
A diffractive Alvarez lens is demonstrated that consists of two separate phase plates, each having complementary 16-level surface-relief profiles that contain cubic phase delays. Translation of these two components in the plane of the phase plates is shown to produce a variable astigmatic focus.
Ian M. Barton, Sham N. Dixit, Leslie J. Summers, Charles A. Thompson, Kenneth Avicola, Julia Wilhelmsen   +5 more
openaire   +2 more sources

Safety of a picosecond laser with diffractive lens array (DLA) in the treatment of Fitzpatrick skin types IV to VI: A retrospective review.

Journal of the American Academy of Dermatology, 2016
A. Haimovic, J. Brauer, Yoon-Soo Cindy Bae, R. Geronemus   +3 more
semanticscholar   +3 more sources

A Prospective, Split‐Face, Randomized Study Comparing a 755‐nm Picosecond Laser With and Without Diffractive Lens Array in the Treatment of Melasma in Asians

Lasers in Surgery and Medicine, 2020
Treatment of melasma with lasers remains a challenge due to its limited clinical efficacy in addition to high rates of recurrence and side effects. Recently, picosecond lasers have shown favorable results in treatment of benign pigmented lesions.
W. Manuskiatti, Chadakan Yan, Ploypailin Tantrapornpong, K. A. Cembrano, Thanya Techapichetvanich, R. Wanitphakdeedecha   +5 more
semanticscholar   +1 more source

Fabrication and characterization of a binary diffractive lens for controlling focal distribution.

Applied Optics, 2020
We fabricated a binary diffractive lens to control focal distribution, such as intensity distribution, by controlling the focal length and depth of focus. The results revealed changes in the focal length and depth of focus as a function of changes in the
A. Motogaito, Yosuke Iguchi, Shuji Kato, K. Hiramatsu   +3 more
semanticscholar   +1 more source

Diffraction-based solid immersion lens

Journal of the Optical Society of America A, 2004
A solid immersion lens based on diffraction (dSIL) is proposed as an alternative to the conventional design based on refraction. A design analogous to a Fresnel zone plate is derived in accordance with the Huygens-Fresnel principle. Fabrication of a binary dSIL is achieved by electron-beam lithography and reactive-ion etching on LaSF35, with index n ...
Robert, Brunner, Matthias, Burkhardt, Alexander, Pesch, Oliver, Sandfuchs, Margit, Ferstl, Sungchul, Hohng, Jeffrey O, White   +6 more
openaire   +2 more sources

Binary subwavelength diffractive-lens design

Optics Letters, 1998
We present a procedure for the design of binary diffractive lenses with pulse-width-modulated subwavelength features. The procedure is based on the combination of two approximate theories, effective medium theory and scalar diffraction theory, and accounts for limitations on feature size and etch depth imposed by fabrication.
J N, Mait, D W, Prather, M S, Mirotznik
openaire   +2 more sources

Diffractive Bifocal Lens Designs

Optometry and Vision Science, 1993
Modifying the number, width, depth, and shape of the echelettes in a diffractive bifocal lens will influence the image intensity and quality within the zero, first, and higher order images. By appropriately varying these parameters optimal bifocal lens designs may be achieved.
openaire   +2 more sources

Efficacy and Safety Evaluation of Picosecond Alexandrite Laser with a Diffractive Lens Array for Treatment of Melasma in Asian Patients by VISIA Imaging System

Photobiomodulation, photomedicine, and laser surgery, 2019
Objective: To evaluate the efficacy and safety of picosecond (ps) 755-nm alexandrite laser with a diffractive lens array (DLA) generating laser-induced optical breakdown, which may be beneficial for melasma treatment. Background: Melasma is notorious for
Yu-Tsung Chen, Erh-Ti Lin, Chang-Cheng Chang, B. Lin, Hsiu-Mei Chiang, Yung-Hsueh Huang, Hui-Ying Lin, Ke Wang, Tsong-Min Chang   +8 more
semanticscholar   +1 more source

Prospective randomized controlled trial comparing treatment efficacy and tolerance of picosecond alexandrite laser with a diffractive lens array and triple combination cream in female asian patients with melasma

Journal of the European Academy of Dermatology and Venereology, 2019
Recent evidence suggests melasma to be a photoaging disorder. Triple combination creams (TCC: fluocinolone acetonide 0.01%, hydroquinone 4% and tretinoin 0.05%) remain the gold standard treatment.
Y. Wang, Erh-Ti Lin, Y. Chen, Pin-Chi Chiu, Bor-Shyh Lin, Hsiu-Mei Chiang, Y. Huang, K.Y. Wang, H. Lin, T.‐M. Chang, C. Chang   +10 more
semanticscholar   +1 more source