Prospective study of removing solar lentigines in Asians using a novel dual-wavelength and dual-pulse width picosecond laser

2018 ◽  
Vol 50 (8) ◽  
pp. 851-858 ◽  
Author(s):  
Kei Negishi ◽  
Hirotaka Akita ◽  
Yukiko Matsunaga
Keyword(s):  
Prospective Study ◽  
Pulse Width ◽  
Picosecond Laser ◽  
Dual Wavelength

A Prospective Study of Fractionated Dual‐Wavelength Picosecond Laser in Treating Acne Scar

2020 ◽  
Vol 52 (8) ◽  
pp. 735-742 ◽  
Author(s):  
Ching‐Sheng Yang ◽  
Yau‐Li Huang ◽  
Chun‐Yu Cheng ◽  
Sindy Hu ◽  
Shyue‐Luen Chang ◽  
...  
Keyword(s):  
Prospective Study ◽  
Picosecond Laser ◽  
Dual Wavelength ◽  
Acne Scar ◽  
A Prospective Study

Treatment of Leg and Face Veins with a Cryogen Spray, Variable Pulse Width 1064 nm Nd:Yag Laser—A Prospective Study of 47 Patients

2002 ◽  
Vol 19 (1) ◽  
pp. 3-8 ◽  
Author(s):  
Cindy Y. Li ◽  
Sorin Eremia
Keyword(s):  
Prospective Study ◽  
Nd:Yag Laser ◽  
Pulse Width ◽  
Skin Type ◽  
Type I ◽  
High Fluences ◽  
Vein Segment ◽  
The Face ◽  
A Prospective Study ◽  
Reticular Veins

Objective: Throughout the 1990s, laser treatment of leg veins was a challenge. Newer, longer wavelength lasers capable of delivering high fluences with larger spot sizes with a variable pulse width have shown promising preliminary results. Experience with these lasers for treatment of facial telangiectasia and periorbital reticular veins is even more scant. To our knowledge this is the first prospective study to evaluate a variable pulse width, cryogen spray—equipped 1064 nm Nd:Yag laser for both the treatment of leg and face veins, including larger periorbital reticular veins. Materials and Methods: Forty-seven volunteers aged 32–67 years (30 with skin type I-V with leg telangiectasia and reticular veins, and 17 with skin type I-IV with face telangiectasia and reticular periorbital veins) were treated with the Nd:Yag laser. For leg vein patients, 2–3 sets of different leg veins were treated with a maximum of 3 treatments. Patients were examined 1 week after each treatment and at 1, 2, and 3 months after the last treatment. All face vein patients received 1 treatment and were examined at 1 month posttreatment. Treatment parameters for both leg and face veins varied with the size of vessels being treated. Pre- and posttreatment 35 mm photos were taken. Improvement was judged by 2 experienced physicians both visually on patients and by comparison of pre- and posttreatment photos. Results were graded as percent resolution in 5 groups: 0%, 0–25%, 25–50%, 50–75%, and 75–100%. Results: Twenty-three of 30 patients completed the leg vein segment of the study. A total of 41 leg vein sites were treated. Greater than 75% improvement was observed at 85% of the treated sites. Greater than 50% improvement was observed at 95% of the treated sites. Less than 25% improvement was observed at 5% of the treated sites. Seventeen of 17 patients completed the face vein segment of the study, and 32 sites were treated (24 cheeks, noses, and chin telangiectasia and 8 periorbital reticular veins). Greater than 75% improvement was observed at 97% of the treated sites. Greater than 50% improvement was observed at 100% of the treated sites. Notably, 100% of the facial reticular veins treated had essentially 100% resolution. Pain during treatment was variably perceived by patients, but was occasionally sufficient for patients to decline further treatment. Transient hemosiderin pigmentation, as seen with sclerotherapy, was common with larger vessels. Conclusion: The cryogen spray-equipped 1064 nm Nd: Yag laser was remarkably effective and safe for skin type I-V patients. Excellent results for leg veins, approaching sclerotherapy outcomes, were obtained for both 0.3–1.5 mm telangiectasia and larger 1.5–3.0 mm reticular veins. Furthermore, this 1064 Nd:Yag laser is also an outstanding tool for treatment of facial telangiectasia with little if any risk of purpura. For the first time we appear to have a safe and effective treatment for 1–2 mm periorbital reticular veins. The use of topical anesthesia may be needed for some patients.

scholarly journals Scanning electron microscope studies on laser ablation of solids

2019 ◽  
Vol 37 (01) ◽  
pp. 101-109 ◽  
Author(s):  
Mohamed E. Shaheen ◽  
Joel E. Gagnon ◽  
Brian J. Fryer
Keyword(s):  
Pulse Width ◽  
Laser Energy ◽  
Laser System ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Ablation Rate ◽  
Laser Wavelength ◽  
High Laser Fluence ◽  
Electron Imaging ◽  
Scanning Electron

AbstractThis study investigates the interaction of picosecond laser pulses with sapphire and brass in air using scanning electron microscopy. A picosecond laser system operating at a wavelength of 785 nm, pulse width of 110 ps, and variable repetition rate (1–1000 Hz) was used in this study. The pulse width applied in this work was not widely investigated as it lies in the gap between ultrashort (femtosecond) and long (nanosecond) pulse width lasers. Different surface morphologies were identified using secondary electron and backscattered electron imaging of the ablated material. Thermal ablation effects were more dominant in brass than in sapphire. Exfoliation and fractures of sapphire were observed at high laser fluence. Compared with brass, multiple laser pulses were necessary to initiate ablation in sapphire due to its poor absorption to the incident laser wavelength. Ablation rate of sapphire was lower than that of brass due to the dissipation of a portion of the laser energy due to heating and fracturing of the surface.

Laser Treatment of Professional Tattoos With a 1064/532-nm Dual-Wavelength Picosecond Laser

2017 ◽  
Vol 43 (12) ◽  
pp. 1434-1440 ◽  
Author(s):  
Arielle N.B. Kauvar ◽  
Terrence C. Keaney ◽  
Tina Alster
Keyword(s):  
Laser Treatment ◽  
Picosecond Laser ◽  
Dual Wavelength ◽  
532 Nm
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