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q switched laser

Brian S Biesman, Cara Costner
BACKGROUND AND OBJECTIVE: Laser-assisted treatment of tattoos is well recognized to produce opaque epidermal whitening that prevents multiple sequential passes during a single treatment session. The amount of epidermal whitening produced in association with the procedure can be minimized by topical application of perfluorodecalin (PFD), which is an optical clearing agent. This pivotal trial assessed the ability of a transparent PFD-infused patch used in conjunction with a Q-switched nanosecond laser in the treatment of tattoos to permit multiple laser passes during a single 5 minute treatment session in comparison to the number of passes that could be completed using conventional treatment of the tattoo with the laser alone...
March 20, 2017: Lasers in Surgery and Medicine
Cao Yongqian, Lin Li, Bi Jianhai, Huo Ran, Guo Li, Wei Hao, Wang Xining, Xie Shigang, Wang Yibing
We aimed to investigate the efficacy and safety of using the 1064-nm Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) laser (QSNYL) for skin rejuvenation in patients with Nevus of Ota. A retrospective, randomized, split-faced, clinical study was conducted. Twenty-nine patients with unilateral moderate to severe Nevus of Ota were enrolled. The participants completed 3-13 sessions of QSNYL treatments 3-6 months apart. Two independent physicians compared the treated and untreated sides of the face to evaluate the clearance of Nevus of Ota, the wrinkle severity rating scale (WSRS), the global aesthetic improvement scale (GAIS), and adverse event reporting...
March 15, 2017: Lasers in Medical Science
Jeffrey M Krase, Silvija P Gottesman, Gerald N Goldberg
No abstract text is available yet for this article.
March 14, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Pavel Loiko, Josep Maria Serres, Xavier Mateos, Magdalena Aguiló, Francesc Díaz, Lizhen Zhang, Zhoubin Lin, Haifeng Lin, Ge Zhang, Konstantin Yumashev, Valentin Petrov, Uwe Griebner, Yicheng Wang, Sun Yung Choi, Fabian Rotermund, Weidong Chen
Monoclinic thulium-doped magnesium monotungstate, Tm<sup>3+</sup>:MgWO<sub>4</sub>, is promising for efficient power-scalable continuous-wave (CW) and passively Q-switched lasers at >2  μm. Under diode pumping at 802 nm, a compact CW laser based on Z-cut Tm:MgWO<sub>4</sub> generated 3.09 W at 2022-2034 nm with a slope efficiency of 50% which represents the highest output power ever achieved with this type of laser host. Stable passive Q-switching of the Tm:MgWO<sub>4</sub> laser is demonstrated for the first time, to the best of our knowledge, using single-walled carbon nanotubes, graphene, and Cr<sup>2+</sup>:ZnS saturable absorbers...
March 15, 2017: Optics Letters
Esrom Kifle, Xavier Mateos, Javier Rodríguez Vázquez de Aldana, Airan Ródenas, Pavel Loiko, Sun Yung Choi, Fabian Rotermund, Uwe Griebner, Valentin Petrov, Magdalena Aguiló, Francesc Díaz
Depressed-index channel waveguides with a circular and photonic crystal cladding structures are prepared in a bulk monoclinic Tm:KLu(WO<sub>4</sub>)<sub>2</sub> crystal by 3D direct femtosecond laser writing. The channel waveguide structures are characterized and laser operation is achieved using external mirrors. In the continuous-wave mode, the maximum output power of 46 mW is achieved at 1912 nm corresponding to a slope efficiency of 15.2% and a laser threshold of only 21 mW. Passive Q-switching of a waveguide with a circular cladding is realized using single-walled carbon nanotubes...
March 15, 2017: Optics Letters
Jørgen Serup, Wolfgang Bäumler
Clinicians in the fields of general medicine, dermatology, and plastic surgery are in their work now and then confronted with tattoo complications. Recognizing the rather few important diagnostic groups and urgencies, the medical 'decision tree' of treatment becomes quite simple. Acute conditions are dominated by bacterial infections needing antibiotic treatment. Systemic infection is a matter of urgency and requires intravenous treatment in a hospital without delay to prevent septic shock. Inflammatory reactions are a real challenge...
2017: Current Problems in Dermatology
Maurice A Adatto, Ruthie Amir, Jayant Bhawalkar, Rafael Sierra, Richard Bankowski, Doran Rozen, Christine Dierickx, Moshe Lapidoth
Early methods of tattoo removal ultimately resulted in unacceptable cosmetic outcomes. While the introduction of laser technology was an improvement over the existing chemical, mechanical, and surgical procedures, the use of nonselective tattoo removal with carbon dioxide and argon lasers led to scarring. Q-switched lasers with nanosecond (10-9) pulse domains were considered to have revolutionized tattoo treatment, by selectively heating the tattoo particles, while reducing the adverse sequelae to adjacent normal skin...
2017: Current Problems in Dermatology
Katrina Hutton Carlsen, Jørgen Esmann, Jørgen Serup
Studies of satisfaction with tattoo removal outcomes by laser, rated by clients themselves, including qualitative aspects, are sparse. We studied long-term results and client satisfaction with tattoo removal by Q-switched YAG laser. Client satisfaction is influenced by numerous factors: pretreatment expectations, objective observations, pretreatment information, laser treatment procedures, and outcome, including subjective experiences such as pain. Client-surgeon interaction during the full laser treatment course is a major determinant of client satisfaction...
2017: Current Problems in Dermatology
Syrus Karsai
Tattoo removal by Q-switched nanosecond laser devices is generally a safe and effective method, albeit a time-consuming one. Despite the newest developments in laser treatment, it is still not possible to remove every tattoo completely and without complications. Incomplete removal remains one of the most common challenges. As a consequence, particular restraint should be exercised when treating multicoloured tattoos, and patients need to be thoroughly informed about remaining pigment. Other frequent adverse effects include hyper- and hypopigmentation as well as ink darkening; the latter is particularly frequent in permanent make-up...
2017: Current Problems in Dermatology
Imran Majid, Saher Imran
Q-switched (QS) lasers are used for depigmentation in universal vitiligo, but there is limited data on long-term results after laser treatment. This study was conducted to assess the safety and long-term follow-up results of QS Nd:YAG laser treatment in combination with need-based topical depigmentation therapy for universal vitiligo. A retrospective study was performed on patients with universal vitiligo who had received QS Nd:YAG laser treatment from 2010 to 2013. All patients were contacted and called for follow-up...
March 7, 2017: Lasers in Medical Science
Asma Sadat Motamedi, Hamid Mirzadeh, Fereshteh Hajiesmaeilbaigi, Shadab Bagheri Khoulenjani, Mohammad Ali Shokrgozar
In this study, gold nanoparticles/Polyvinylidenefluoride composite electrospun mat with enhanced piezoelectricity were fabricated and characterized. Gold colloidal nanoparticles (Au NPs) were prepared via laser ablation of metallic targets in liquid media. The active Q-switched Nd:YAG laser was used as an irradiation source. Then, PVDF (Polyvinylidenefluoride) was dissolved in Au NPs colloidal solution at 30% wt for the synthesis of Au NPs/PVDF composite nanofibers by electrospinning. The optical absorbance spectra of Au NPS and the polymeric solutions were obtained by the UV-Visible spectroscopy...
March 3, 2017: Journal of Biomedical Materials Research. Part A
Piyali Chatterjee, Arup K Ghosh, Tapas Chakraborty
In this paper, we report finding of a remarkable chemical effect of hydrogen bonding, elimination of hydrogen fluoride (HF) from the hydrogen bonded dimers of 2-fluorophenol (2-FP) and 3-fluorophenol (3-FP), in a supersonic jet expansion upon multi-photon ionization using 4th harmonic wavelength (266 nm) of a Q-switched Nd:YAG laser, and the reaction has been probed by time-of-flight mass spectrometry. No HF elimination is observed to occur by such means from the monomer of 3-FP, but it occurs with a small yield from the monomer of 2-FP...
February 28, 2017: Journal of Chemical Physics
Z Sanjabi Eznaveh, M A Eftekhar, J E Antonio Lopez, M Kolesik, A Schülzgen, F W Wise, D N Christodoulides, R Amezcua Correa
We demonstrate that frequency generation in multimode parabolic-index fibers can be precisely engineered through appropriate fiber design. This is accomplished by exploiting the onset of a geometric parametric instability that arises from resonant spatiotemporal compression. By launching the output of an amplified Q-switched microchip laser delivering 400 ps pulses at 1064 nm, we observe a series of intense frequency sidebands that strongly depend on the fiber core size. The nonlinear frequency generation is analyzed in three fiber samples with 50 μm, 60 μm, and 80 μm core diameters...
March 1, 2017: Optics Letters
Junpeng Qiao, Shengzhi Zhao, Kejian Yang, Jia Zhao, Guiqiu Li, Dechun Li, Tao Li, Wenchao Qiao
Two-dimensional (2D) materials, especially transition-metal dichalcogenides, such as molybdenum disulfide (MoS<sub>2</sub>) and tungsten disulfide (WS<sub>2</sub>), have attracted great interests due to their exceptional optical properties as saturable absorbers in laser systems. In this work, at first, we presented a diode-pumped passively Q-switched laser with MoS<sub>2</sub> saturable absorber (MoS<sub>2</sub>-SA). At an incident pump power of 6.54 W, a maximum output power of 1...
February 20, 2017: Optics Express
Pengbo Jiang, Xin Ding, Bin Li, Jian Liu, Xuanyi Yu, Guizhong Zhang, Bing Sun, Cen Zhao, Liang Wu, Jianquan Yao
Here we propose an efficient diode-end-pumped actively Q-switched 1176-nm Nd:YAG/Nd:YVO<sub>4</sub> hybrid gain intracavity Raman laser. By virtue of the construction of a coaxial double crystal, the laser not only can operate efficiently at low pulse repetition frequencies (PRFs), thereby realizing relatively high-energy and high-peak-power pulsed output, but also is capable of generating a high average output power at high PRFs. A maximum pulse energy of 0.54 mJ for the 1176-nm Stokes light is achieved at the PRF of 10 kHz, and the maximum average output power up to 9...
February 20, 2017: Optics Express
Gregory A Aird, Jenna L Sitenga, Austin Huy Nguyen, Adam Vaudreuil, Christopher J Huerter
Treatment of disseminated superficial actinic porokeratosis (DSAP) is poorly standardized. The present review seeks to comprehensively discuss the potential for laser and light modalities in the treatment of DSAP. A systematic review of light and laser treatment modalities was conducted to include 26 cases of patients with DSAP. Systematic review resulted in 14 articles to be included. Photodynamic therapy (PDT) overall was the least successful treatment modality, with clinical improvement seen in a minority of patients (MAL-PDT: N = 9 patients, 33...
February 27, 2017: Lasers in Medical Science
Xiaofeng Liu, Qiangbing Guo, Jianrong Qiu
Low-dimensional (LD) materials demonstrate intriguing optical properties, which lead to applications in diverse fields, such as photonics, biomedicine and energy. Due to modulation of electronic structure by the reduced structural dimensionality, LD versions of metal, semiconductor and topological insulators (TIs) at the same time bear distinct nonlinear optical (NLO) properties as compared with their bulk counterparts. Their interaction with short pulse laser excitation exhibits a strong nonlinear character manifested by NLO absorption, giving rise to optical limiting or saturated absorption associated with excited state absorption and Pauli blocking in different materials...
February 22, 2017: Advanced Materials
Zhenyu You, Yijian Sun, Dunlu Sun, Zaojie Zhu, Yan Wang, Jianfu Li, Chaoyang Tu, Jinlong Xu
We report passively Q-switched ∼2 and ∼3  μm mid-infrared (MIR) solid-state lasers with a self-assembly solvothermal-synthesized Bi<sub>2</sub>Te<sub>3</sub>/graphene heterostructure saturable absorber (SA) for the first time. Based on the oxidation resistance and high thermal conductivity of graphene, and large modulation depth of Bi<sub>2</sub>Te<sub>3</sub> nanosheets, two high-performance Q-switching lasers were realized. One is a Tm:YAP laser with a maximum average output power of 2...
February 15, 2017: Optics Letters
Hongkun Nie, Peixiong Zhang, Baitao Zhang, Kejian Yang, Lianhan Zhang, Tao Li, Shuaiyi Zhang, Jianqiu Xu, Yin Hang, Jingliang He
A diode-end-pumped continuous-wave (CW) and passively Q-switched Ho, Pr:LiLuF<sub>4</sub> (Ho, Pr:LLF) laser operation at 2.95 μm was demonstrated for the first time, to the best of our knowledge. The maximum CW output power was 172 mW. By using a monolayer graphene as the saturable absorber, the passively Q-switched operation was realized, in which regimes with the highest output power, the shortest pulse duration, and the maximum repetition rate were determined to be 88 mW, 937.5 ns, and 55.7 kHz, respectively...
February 15, 2017: Optics Letters
Wensong Li, Tuanjie Du, Jinglong Lan, Changlei Guo, Yongjie Cheng, Huiying Xu, Chunhui Zhu, Fengqiu Wang, Zhengqian Luo, Zhiping Cai
We experimentally demonstrated a compact single-wall carbon-nanotube (SWNT)-based deep-red passively Q-switched Pr<sup>3+</sup>-doped ZBLAN all-fiber laser operating at 716 nm. A free-standing SWNT/polyvinyl alcohol composite film embedded between a pair of fiber connectors was employed as a saturable absorber (SA). The deep-red Q-switched operation is attributed to the combination of implementing a pair of fiber end-facet mirrors to achieve the linear laser resonator and incorporating a SWNT-SA into the cavity as a Q-switcher...
February 15, 2017: Optics Letters
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