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Can Cihan, Abdullah Muti, Isinsu Baylam, Askin Kocabas, Umit Demirbas, Alphan Sennaroglu
We report, to the best of our knowledge, the shortest femtosecond pulses generated from a Kerr-lens mode-locked (KLM) Alexandrite laser operating near 750 nm. The Alexandrite gain medium was pumped with a continuous-wave (cw), 532 nm laser, and the performance of both the short and extended resonators was investigated. The use of an extended cavity eliminated the multi-wavelength spectral instabilities observed during the cw operation of the short cavity. Furthermore, since the repetition rate of the Alexandrite laser was reduced from 107 to 5...
March 15, 2018: Optics Letters
Mengli Zhang, Yuqing Huang, Tong Lin, Qiuju Wu
OBJECTIVE: To retrospectively evaluate the efficacy of an Alexandrite picosecond laser versus Nd:YAG nanosecond laser for removing blue-black eyeliner tattoos which have existed more than 10 years. METHODS: A total of 40 patients were treated with an Alexandrite picosecond laser in our department from August 2015 to July 2017, with a fluence of 1.96-6.37J/cm2 , spot size of 2.0-3.6 mm, and pulse width of 750 ps. Another 32 patients were treated with an Nd:YAG nanosecond laser, with a fluence of 2...
February 28, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Adrian Alegre-Sanchez, Natalia Jiménez-Gómez, Óscar M Moreno-Arrones, Pablo Fonda-Pascual, Bibiana Pérez-García, Pedro Jaén-Olasolo, Pablo Boixeda
The novel picosecond lasers, initially developed for faster tattoo removal, have also shown great efficacy in endogenous pigmentary disorders. To describe the efficacy and safety profile of an alexandrite (755-nm) picosecond laser in a wide range of pigmented flat and elevated cutaneous lesions. A retrospective study was performed in which we collected all the clinical images of patients treated with the 755-nm alexandrite picosecond laser for 12 months (November 2016-November 2017). Clinical features were obtained from their medical charts...
February 9, 2018: Lasers in Medical Science
Tom Barrett, Sally de Zwaan
Minocycline is a commonly prescribed tetracycline antibiotic used for the treatment of a number of dermatological conditions including acne and rosacea. Long-term adverse effects of minocycline include cutaneous hyperpigmentation. Various treatment options have been suggested for the treatment of minocycline pigmentation. We report a case of a patient on long-term low-dose minocycline for the treatment of rosacea with type III minocycline hyperpigmentation. A comparison was made between Q-Switch Nd:YAG and picosecond laser over a nine 9-period with treatments spaced 1 month apart, with a clearance in the patient pigmentation after four treatments with picosecond laser...
February 5, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Yiming Li, Li Li
No abstract text is available yet for this article.
January 2018: JAAD Case Reports
Lin Peng, Yin Yang, Yiping Ge, Tong Lin
Nevus of Ota, also known as nevus fusco-caeruleus ophthalmo-maxillaris, is a benign dermal melanocytosis that typically affects the Asians. The patients experience psychosocial distress related to disfigurement and often seek for treatments. Q-switched lasers have demonstrated positive clinical results. This article is protected by copyright. All rights reserved.
January 22, 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
Shirin Ghanbari, Ksenia A Fedorova, Andrey B Krysa, Edik U Rafailov, Arkady Major
An Alexandrite laser passively mode-locked using an InP/InGaP quantum-dot semiconductor saturable absorber mirror (QD-SESAM) was demonstrated. The laser was pumped at 532 nm and generated pulses as short as 380 fs at 775 nm with an average output power of 295 mW. To the best of our knowledge, this is the first report on a passively mode-locked femtosecond Alexandrite laser using a SESAM in general and a QD-SESAM in particular.
January 15, 2018: Optics Letters
Bridget E Shields, Molly S Moye, Rodrigo Bayon, Steven M Sperry, Karolyn A Wanat
OBJECTIVES: To present a case series of 4 patients who underwent postoperative hair removal using the long-pulsed Alexandrite or Nd:YAG laser following intraoral cutaneous flap reconstruction. METHODS: Patients underwent epilation in dermatology clinic with long-pulsed Alexandrite or Nd:YAG lasers, spaced 8 weeks apart, until hair removal was achieved. RESULTS: All patients achieved improvement in hair removal regardless of initial flap donor site with significant improvement in quality of life and minimal side effects...
March 2018: Annals of Otology, Rhinology, and Laryngology
Wenyou Yu, Jiafang Zhu, Wenxin Yu, Dongze Lyu, Xiaoxi Lin, Zhen Zhang
BACKGROUND: Q-switched alexandrite lasers (QSAL) have been used for the treatment of acquired bilateral nevus of Ota-like macules (ABNOM). Currently, picosecond alexandrite laser (PSAL) pulses have become available for pigmentary disorders. However, no studies have compared PSAL and QSAL in the treatment of ABNOM. OBJECTIVE: To compare the efficacy and safety of a PSAL and a QSAL in the treatment of ABNOM. METHODS: Each patient (n = 30) received three treatments at six-month intervals...
December 26, 2017: Journal of the American Academy of Dermatology
Ye Jin Lee, Ho Jeong Shin, Tai-Kyung Noh, Kwang-Ho Choi, Sung-Eun Chang
The picosecond lasers have shown to effectively treat tattoo pigments that are intractable to previous multiple Q-switched (QS) laser treatments. Therefore we hypothesized that a picosecond laser would show better efficacy with minimal adverse events in the treatment of melasma and post-inflammatory hyperpigmentation (PIH) that are difficult to treat with conventional QS lasers. Two patients with melasma and one patient with PIH were treated with a Picosecond 755-nm Alexandrite Laser (Cyanosure, USA). All patients were Korean with skin type IV and no longer responding to QS laser treatments...
December 2017: Annals of Dermatology
Christine Dierickx
OBJECTIVE: The picosecond 755 nm alexandrite laser using a diffractive lens array has demonstrated consistent clinical efficacy for improving the appearance of acne scarring and wrinkles amongst other benefits. This small pilot study is to assess the difference, if any, in clinical benefit if a higher than the standard protocol for number of pulses delivered to a tissue area is used compared to the standard protocol guidelines. METHOD: Seven subjects received treatment to one side of the face with a standard protocol number of laser pulses with the other side of the face receiving higher than standard number of pulses from the same 755 nm picosecond laser using an additional diffractive lens array...
November 15, 2017: Lasers in Surgery and Medicine
Monique J Vanaman Wilson, Isabela T Jones, Joanna Bolton, Lisa Larsen, Douglas C Wu, Mitchel P Goldman
BACKGROUND: Infraorbital dark circles result from a combination of factors. The fractionated picosecond 755 nm alexandrite laser and dual wavelength picosecond Nd:YAG laser have not been examined as a method of addressing infraorbital hyperpigmentation. OBJECTIVE: To determine the efficacy and safety of treatment of infraorbital dark circles using fractionated picosecond 755 nm and dual wavelength picosecond Nd:YAG laser. METHODS AND MATERIALS: These trials did not utilize a comparative design; rather, these were separate, prospective, open-label, evaluator-blinded trials utilizing two treatment regimens: (i) 19 adult subjects were treated in a single session with the dual wavelengths of 532 nm and 1,064 nm in consecutive passes using the fractionated lens; (ii) 10 adult subjects were treated using the picosecond 755 nm laser via the fractionated lens in three treatment sessions at 3 week intervals...
January 2018: Lasers in Surgery and Medicine
Emil Tanghetti Md, John Jennings
BACKGROUND AND OBJECTIVES: This study was performed to better understand the cutaneous effects of using a fractional picosecond laser at 755 nm with a diffractive lens array and a picosecond Nd:YAG laser at 532 mn and 1064 nm with a holographic optic. We characterized the injuries created by these devices on skin clinically and histologically over 24 hours. With this information we modeled the effects of these devices on a cutaneous target. METHODS: Eight patients, representing Fitzpatrick skin types I-VI, were treated on their backs with a picosecond Alexandrite laser with a diffractive lens array, as well as a picosecond Nd:YAG laser at 532 nm and 1064 nm with a holographic optic...
January 2018: Lasers in Surgery and Medicine
Pierre Pichon, Adrien Barbet, Jean-Philippe Blanchot, Frédéric Druon, François Balembois, Patrick Georges
Taking advantage of light-emitting-diode (LED) performance breakthrough driven by the lighting market, we report, to the best of our knowledge, the first LED-pumped chromium-doped crystal laser oscillator and amplifier based on alexandrite crystals (Cr(3+):BeAl2O4). We developed a Ce:YAG concentrator as the pumped source, illuminated by blue LEDs that can be easily power scaled. With 2200 LEDs (450 nm), the Ce:YAG concentrator can deliver to the gain medium up to 268 mJ at 10 Hz at 550 nm with a irradiance of 8...
October 15, 2017: Optics Letters
Adam Honeybrook, Tascha Crossing, Eric Bernstein, Jason Bloom, Julie Woodward
One underreported, rare side effect of laser hair removal is paradoxical hypertrichosis. It is largely unknown what the long-term outcomes are of patients who develop this complication. We report a 21-year-old, Fitzpatrick II, male patient, who had patchy areas of dark hair affecting various body areas. An Alexandrite 755 nm laser was used to address the desired areas at energies between 20 and 22 J/cm2 at 10-12-week intervals over a course of seven treatments. After three treatments, the patient noted a significant increase in the density and length of hairs involving the back, shoulders, neck, and upper arms...
October 11, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Chun-Man Lee
Poly cystic ovarian syndrome (PCOS) has been described as the common diagnosis for hirsutism in women. Facial hirsutism is by far the most distressing symptom of hyperandrogenism in women with PCOS. A statistically significant improvement in psychological well-being has been reported in patients with PCOS allocated for laser-assisted hair removal. The theory of selective photothermolysis has revolutionized laser hair removal in that it is effective and safe, when operated by sufficiently trained and experienced professionals...
October 11, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Abeer Tawfik, Mai Abdelraouf Osman, Iman Rashwan
BACKGROUND: Acne keloidalis nuchae (AKN) is a dermatological condition characterized by follicular-based papules and pustules that later form hypertrophic or keloid-like scars. Laser-assisted hair reduction such as 810-nm diode laser and 1,064-nm Nd:YAG laser have been used for treating AKN with promising results. OBJECTIVE: To evaluate the therapeutic effect and safety of alexandrite laser in the treatment of different lesions of AKN. METHODS: Seventeen male patients with AKN received 6 sessions of 755-nm alexandrite laser...
October 6, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Bernd Kaifler, Christian Büdenbender, Peter Mahnke, Matthias Damm, Daniel Sauder, Natalie Kaifler, Markus Rapp
We report on the development of a pulsed neodymium-doped yttrium aluminum garnet (Nd:YAG) laser operating at a 1116 nm wavelength. Because the third harmonic is within a few gigahertz of the 372 nm absorption line of iron, this laser system represents an alternative to alexandrite lasers commonly used in iron fluorescence lidars. With our prototype, we achieved a 0.5 W at 372 nm wavelength and a 100 Hz pulse repetition frequency. As a proof of concept, we show iron density measurements, which have been acquired using the novel lidar transmitter...
August 1, 2017: Optics Letters
Douglas C Wu, Mitchel P Goldman
No abstract text is available yet for this article.
September 20, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Daniel A Belkin, Julia P Neckman, Hana Jeon, Paul Friedman, Roy G Geronemus
Importance: Response to laser treatment for café au lait macules (CALMs) is inconsistent and difficult to predict. Objective: To test the hypothesis that irregularly bordered CALMs of the "coast of Maine" subtype respond better to treatment than those of the smooth-bordered "coast of California" subtype. Design, Setting, and Participants: This retrospective case series included patients from 2 multiple-clinician US practices treated from 2005 through 2016...
November 1, 2017: JAMA Dermatology
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