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https://www.readbyqxmd.com/read/28774038/a-filmy-black-phosphorus-polyimide-saturable-absorber-for-q-switched-operation-in-an-erbium-doped-fiber-laser
#1
Tianxian Feng, Dong Mao, Xiaoqi Cui, Mingkun Li, Kun Song, Biqiang Jiang, Hua Lu, Wangmin Quan
We demonstrate an erbium-doped fiber laser passively Q-switched by a black-phosphorus polyimide film. The multi-layer black-phosphorus (BP) nanosheets were prepared via a liquid exfoliation approach exploiting N-methylpyrrolidone as the dispersion liquid. By mixing the BP nanosheets with polyimide (PI), a piece of BP-PI film was obtained after evaporating the mixture in a petri dish. The BP-PI saturable absorber had a modulation depth of 0.47% and was inserted into an erbium-doped fiber laser to realize passive Q-switched operations...
November 11, 2016: Materials
https://www.readbyqxmd.com/read/28761293/treatment-and-classification-of-nevus-of-ota-a-seven-year-review-of-a-single-institution-s-experience
#2
Jae-Hui Nam, Han-Saem Kim, Young Jun Choi, Ho Joo Jung, Won-Serk Kim
BACKGROUND: Nevus of Ota (NO) is a relatively common pigmentary disorder in Asians. Tanino's classification is an old but tacit consensus to delineate the disease. Various treatment options have been presented. However, a few studies have been conducted on available laser options and current treatment strategies or the classification of NO. OBJECTIVE: To investigate current laser options and their effectiveness for the treatment of NO, contributing factors to clinical outcomes, and verification of classification...
August 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28761290/beneficial-effect-of-low-fluence-1-064-nm-q-switched-neodymium-yttrium-aluminum-garnet-laser-in-the-treatment-of-senile-lentigo
#3
Jae-Hui Nam, Han-Saem Kim, Ga-Young Lee, Won-Serk Kim
BACKGROUND: Low fluence 1,064 nm Q-switched (QS) Neodymium:Yttrium-Aluminum-Garnet (Nd:YAG) laser treatment, also known as laser toning, is widely used for pigmentary disorders. There has been no reliable evaluation of the effect of low fluence 1,064 nm QS Nd:YAG laser for senile lentigo. OBJECTIVE: To investigate the beneficial effect of low fluence 1,064 nm QS Nd:YAG laser in the treatment of senile lentigo on the face. METHODS: A retrospective review was conducted on patients treated only with repetitive low fluence 1,064 nm QS Nd:YAG laser...
August 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28758261/comparison-of-two-picosecond-lasers-to-a-nanosecond-laser-for-treating-tattoos-a-prospective-randomized-study-on-49-patients
#4
Aurélie Lorgeou, Yvon Perrillat, Nathalie Gral, Sylvie Lagrange, Jean-Philippe Lacour, Thierry Passeron
BACKGROUND: Q-switched nanosecond lasers demonstrated their efficacy in treating most types of tattoos but complete disappearance is not always achieved even after performing numerous laser sessions. Picosecond lasers are supposed to be more efficient in clearing tattoos than nanosecond lasers but prospective comparative data remain limited. OBJECTIVE: To compare on different types of tattoos the efficacy of a nanosecond laser with two types of picosecond lasers...
July 31, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28740326/on-line-laser-radiation-controlled-to-the-removal-of-adhesive-on-teeth-after-bracket-debonding
#5
Clara Gómez, Juan Carlos Palma, Ángel Costela
BACKGROUND AND AIMS: After bracket debonding a correct removal of the adhesive from tooth surfaces without causing any iatrogenic damage to the enamel is needed. However, conventional techniques do not allow a selective removal process. The present article focuses on the removal of adhesive on teeth after bracket debonding by using laser radiation at 355 nm (third harmonic wavelength of a Q-switched Nd:YAG). MATERIAL AND METHODS: Brackets were bonded to 10 extracted human premolars from young patients and removed after a storage period of 2 months...
March 31, 2017: Laser Therapy
https://www.readbyqxmd.com/read/28739025/soldering-mask-laser-removal-from-printed-circuit-boards-aiming-copper-recycling
#6
Marcus Paulo Raele, Lucas Ramos De Pretto, Denise Maria Zezell
Management of waste of electric and electronic equipment (WEEE) is a key issue for modern societies; furthermore, it contains valuable materials that can be recycled, especially in printed circuit boards (PCB), which have approximately one-third of their weight in copper. In this study we demonstrated the use of laser to strip the covering soldering mask on PCB's, thus exposing the copper underneath so that extraction techniques may take place. Using a Q-Switched Nd:YAG laser operating at 1064nm and 532nm we tested the procedure under different energy conditions...
July 21, 2017: Waste Management
https://www.readbyqxmd.com/read/28714145/metallic-mxene-saturable-absorber-for-femtosecond-mode-locked-lasers
#7
Young In Jhon, Joonhoi Koo, Babak Anasori, Minah Seo, Ju Han Lee, Yury Gogotsi, Young Min Jhon
2D transition metal carbides, nitrides, and carbonitides called MXenes have attracted much attention due to their outstanding properties. However, MXene's potential in laser technology is not explored. It is demonstrated here that Ti3 CN, one of MXene compounds, can serve as an excellent mode-locker that can produce femtosecond laser pulses from fiber cavities. Stable laser pulses with a duration as short as 660 fs are readily obtained at a repetition rate of 15.4 MHz and a wavelength of 1557 nm. Density functional theory calculations show that Ti3 CN is metallic, in contrast to other 2D saturable absorber materials reported so far to be operative for mode-locking...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28690515/a-case-of-facial-partial-unilateral-lentiginosis-treated-with-low-fluence-1-064-nm-q-switched-neodymium-doped-yttrium-aluminum-garnet-laser
#8
En Hyung Kim
Partial unilateral lentiginosis (PUL) is an unusual pigmentary disorder characterized by numerous lentigines grouped within an area of normal skin. Although treatment is not necessary, many patients with facial PUL seek medical help for cosmetic reasons. There is no established standard treatment for PUL. Conventional lasers may cause postinflammatory hyperpigmentation because keratinocytes are injured during the process. Also, scarring, long downtime, and pain are important issues. A 19-year-old patient with facial PUL was successfully treated with low-fluence 1,064-nm Q-switched neodymium-doped yttrium aluminum garnet (QS Nd:YAG) laser...
May 2017: Case Reports in Dermatology
https://www.readbyqxmd.com/read/28684320/focal-choroidal-excavation-and-a-traumatic-macular-hole-secondary-to-accidental-q-switched-nd-yag-laser
#9
Yuanlu Shuai, Xianglei Chen, Wangyi Fang, Jia Li, Weizhong Ge, Songtao Yuan, Qinghuai Liu
Today, the widespread use of laser instruments in various fields has resulted in many accidental retinal injuries. Here we describe a rare clinical case of full-thickness macular hole (MH) and focal choroidal excavation (FCE) caused by a 1064-nm Q-switched Nd:YAG laser. After pars plana vitrectomy and the following 14 months, consecutive optical coherence tomography imagings showed closure of the MH. Visual acuity improved even in the absence of the outer retina and in the presence of FCE. We speculate that different focusing effects of the unexpected Nd:YAG laser which target different levels of retinal tissue generates diverse prognosis...
July 3, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28682146/treatment-of-caf%C3%A3-au-lait-macules-with-a-high-fluenced-1-064-nm-q-switched-neodymium-yttrium-aluminum-garnet-laser
#10
Jiehoon Kim, Hoon Hur, Yu Ri Kim, Sung Bin Cho
Café-au-lait macules (CALMs) are light to dark brown macules or patches of increased melanin concentration found along the dermoepidermal junction. Although many attempts to treat CALMs using various kinds of laser/light-based devices have been reported, CALMs remain refractory thereto with high recurrence rates. In this case series, we describe four patients with idiopathic CALMs that were effectively and safely treated with a non-ablative, high-fluenced, Q-switched (QS), 1,064-nm neodymium:yttrium aluminum garnet (Nd:YAG) laser...
July 6, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28680079/single-block-pulse-on-electro-optic-q-switch-made-of-linbo-3
#11
Jifang Shang, Jun Sun, Qinglian Li, Jinfeng Yang, Ling Zhang, Jingjun Xu
A novel LiNbO3 (lithium niobate, LN) electro-optic (EO) Q-switch that can independently operate in the pulse-on regime without the assistance of a quarter-wave plate (QWP) or analyzer was designed and demonstrated. By theoretical analysis and calculations, the proper orientation of the LN was determined to be θ = 1.7° and φ = ±45°, and the quarter-wave voltage was identical to that of a conventional LN EO Q-switch. Additionally, the possible influences caused by the small angular variation between the wave normal and optic axis were found to be negligible...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28669429/hybrid-photoacoustic-ultrasound-tomograph-for-real-time-finger-imaging
#12
Milan Oeri, Wolfgang Bost, Nicolas Sénégond, Steffen Tretbar, Marc Fournelle
We report a target-enclosing, hybrid tomograph with a total of 768 elements based on capacitive micromachined ultrasound transducer technology and providing fast, high-resolution 2-D/3-D photoacoustic and ultrasound tomography tailored to finger imaging. A freely programmable ultrasound beamforming platform sampling data at 80 MHz was developed to realize plane wave transmission under multiple angles. A multiplexing unit enables the connection and control of a large number of elements. Fast image reconstruction is provided by GPU processing...
June 29, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28666611/treatment-of-xanthelasma-palpebrarum-with-a-1064-nm-q-switched-nd-yag-laser
#13
Jun Khee Heng, Sze Hon Chua, Chee Leok Goh, Suzanne Cheng, Virlynn Tan, Wee Ping Tan
BACKGROUND: Xanthelasma palpebrarum is the most common cutaneous xanthoma characterized by soft, yellow papules or plaques that arise on the periorbital skin. As these lesions can be cosmetically disfiguring, many patients seek medical help to remove these lesions. OBJECTIVE: To determine the effectiveness and minimum number of treatment sessions with a 1064-nm, Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) laser for the treatment of xanthelasma. METHODS: A retrospective review of patients with xanthelasma consecutively treated with Q-switched Nd:YAG laser was conducted...
June 27, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28662404/novel-laser-induced-photoacoustic-spectroscopy-for-instantaneous-trace-detection-of-explosive-materials
#14
Yasser H El-Sharkawy, Sherif Elbasuney
Laser photoacoustic spectroscopy (LPAS) is an attractive technology in terms of simplicity, ruggedness, and overall sensitivity; it detects the time dependent heat generated (thermo-elastic effect) in the target via interaction with pulsed optical radiation. This study reports on novel LPAS technique that offers instant and standoff detection capabilities of trace explosives. Over the current study, light is generated using pulsed Q-switched Nd:YAG laser; the generated photoacoustic response in stimulated explosive material offers signature values that depend on the optical, thermal, and acoustical properties...
June 15, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28661993/commentary-on-the-clinical-and-histological-effect-of-a-low-fluence-q-switched-1-064-nm-neodymium-yttrium-aluminum-garnet-laser-for-the-treatment-of-melasma-and-solar-lentigo-in-asians
#15
Arielle N B Kauvar
No abstract text is available yet for this article.
June 28, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28660978/tailoring-the-optical-properties-of-atomically-thin-ws2via-ion-irradiation
#16
L Ma, Y Tan, M Ghorbani-Asl, R Boettger, S Kretschmer, S Zhou, Z Huang, A V Krasheninnikov, F Chen
Two-dimensional transition metal dichalcogenides (TMDCs) exhibit excellent optoelectronic properties. However, the large band gaps in many semiconducting TMDCs make optical absorption in the near-infrared (NIR) wavelength regime impossible, which prevents applications of these materials in optical communications. In this work, we demonstrate that Ar(+) ion irradiation is a powerful post-synthesis technique to tailor the optical properties of the semiconducting tungsten disulfide (WS2) by creating S-vacancies and thus controlling material stoichiometry...
June 29, 2017: Nanoscale
https://www.readbyqxmd.com/read/28657378/a-split-face-investigator-blinded-comparative-study-on-the-efficacy-and-safety-of-q-switched-nd-yag-laser-plus-microneedling-with-vitamin-c-versus-q-switched-nd-yag-laser-for-the-treatment-of-recalcitrant-melasma
#17
Pelin Ustuner, Ali Balevi, Mustafa Ozdemir
BACKGROUND: High recurrence has previously been reported in the treatment of melasma with low-fluence 1,064-nm QS-Nd:YAG laser. However, the efficacy and safety of QS-Nd:YAG laser plus microneedling with vitamin C has not been evaluated in patients with mixed-type melasma. MATERIAL AND METHODS: Sixteen patients with recalcitrant dermal- or mixed-type melasma were included in the study. One side of patients' face was treated with QS-Nd:YAG plus microneedling with vitamin C (Group A) and the other side with QS-Nd:YAG alone (Group B) for four sessions at four-week intervals...
June 28, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28641206/efficacy-of-surgical-laser-therapy-in-the-management-of-oral-pigmented-lesions-a-systematic-review
#18
Tariq Abduljabbar, Fahim Vohra, Zohaib Akram, Siti Mariam Ab Ghani, Nawwaf Al-Hamoudi, Fawad Javed
BACKGROUND: Oral pigmentation, especially in the gingiva poses esthetic problems. Laser therapy has been widely used for cosmetic therapy in dentistry. The aim of the present study was to systematically review the efficacy of surgical laser therapy (SLT) in the management of oral pigmented lesions (OPL). MATERIALS AND METHODS: The addressed focused question was "Is SLT effective in the management of OPL?" Databases (MEDLINE via PubMed; EMBASE; Cochrane Central Register of Controlled Trials and Cochrane Oral Health Group Trials Register databases) were searched from 1970 up to and including February 2017...
June 15, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28618525/influence-of-liquid-crystalline-phases-on-the-tunability-of-a-random-laser
#19
José Trull, Josep Salud, Sergio Diez-Berart, David O López
In this paper, we report the temperature behavior of an optimized disordered photonic system-based liquid crystal by means of heat capacity and refractive index measurements. The scattering system is formed by a porous borosilicate glass random matrix (about 60%) infiltrated with a smectogenic liquid crystal (about 16%) and a small amount of laser dye (0.1%). The rest of the scattering system is about 24% air, giving rise to a high refractive index contrast scattering system. Such a system has the functionality to change the refractive index contrast with temperature due to the liquid crystal temperature behavior...
May 2017: Physical Review. E
https://www.readbyqxmd.com/read/28614326/highly-efficient-passively-q-switched-tm-yap-laser-using-a-cr-zns-saturable-absorber
#20
Brian Cole, Lew Goldberg
We describe a diode-pumped, passively Q-switched 2 μm Tm:YAP laser generating 10.5 W of average power. The laser utilized a Cr<sup>2+</sup>:ZnS saturable absorber with a nonsaturated transmission (T<sub>0</sub>) of 90% and exhibited a record 46% optical slope efficiency and a 42% overall optical conversion efficiency, both measured relative to the incident 794 nm pump power. At maximum average output power, the laser generated 0.6 mJ Q-switched pulses with a maximum peak power of 32 kW...
June 15, 2017: Optics Letters
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