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https://www.readbyqxmd.com/read/28641206/efficacy-of-surgical-laser-therapy-in-the-management-of-oral-pigmented-lesions-a-systematic-review
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/28614319/led-side-pumped-nd-yag-laser-with-20-optical-efficiency-and-the-demonstration-of-an-efficient-passively-q-switched-led-pumped-solid-state-laser
#4
Chun Yu Cho, Chi Chih Pu, Kuan Wei Su, Yung Fu Chen
A LED-array-pumped Nd:YAG laser with optical conversion efficiency up to 20.2% is demonstrated by direct side-pumping without a coupling lens. The 810-nm LED array with a full-width-half-maximum of 30 nm and an area fill factor of 50% is designed to attain high spectral absorption efficiency with a pump density of 151.8  W/cm<sup>2</sup>. Furthermore, higher than 45% overall coupling efficiency is achieved by placing the LED array as close as possible to the side of the gain medium for overcoming the large pumped divergence...
June 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28566917/some-becker-s-nevus-melanocytes-remain-alive-after-treatment-with-q-switched-alexandrite-laser
#5
Han Jin Jung, Sun Young Moon, Mi Yeung Sohn, Yong Hyun Jang, Seok-Jong Lee, Do Won Kim, Weon Ju Lee
No abstract text is available yet for this article.
June 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28566911/intense-pulsed-light-and-q-switched-1-064-nm-neodymium-doped-yttrium-aluminum-garnet-laser-treatment-for-the-scarring-lesion-of-discoid-lupus-erythematosus
#6
Yun Sun Byun, Jee Hee Son, Yong Se Cho, Bo Young Chung, Hee Jin Cho, Chun Wook Park, Hye One Kim
Discoid lupus erythematosus (DLE) is a chronic form of cutaneous lupus that can cause permanent scarring. Treatment of DLE includes protection from sunlight and artificial sources of ultraviolet light, as well as systemic and topical medications. The first-line standard therapies are antimalarials and topical steroids. Other systemic therapies include systemic steroid, azathioprine, dapsone, and immunosuppressive agents. Topical tacrolimus and pimecrolimus have also been evaluated. Recent studies reported that several treatments, including pulsed dye laser, CO2 laser, intense pulsed light (IPL), and 1,064-nm long-pulse neodymium-doped yttrium aluminum (Nd:YAG) have been used for the cosmetic treatment of DLE...
June 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28529428/successful-management-of-dowling-degos-disease-with-combination-of-q-switched-nd-yag-and-fractional-carbon-dioxide-laser
#7
Swagata Arvind Tambe, Priyanka Deelip Patil, Dattatray Gopal Saple
No abstract text is available yet for this article.
January 2017: Journal of Cutaneous and Aesthetic Surgery
https://www.readbyqxmd.com/read/28492049/a-review-of-laser-and-light-therapy-in-melasma
#8
REVIEW
M K Trivedi, F C Yang, B K Cho
Melasma is a dysregulation of the homeostatic mechanisms that control skin pigmentation and excess pigment is produced. Traditional treatment approaches with topical medications and chemical peels are commonly used but due to the refractory and recurrent nature of melasma, patients often seek alternative treatment strategies such as laser and light therapy. Several types of laser and light therapy have been studied in the treatment of melasma. Intense pulsed light, low fluence Q-switched lasers, and non-ablative fractionated lasers are the most common lasers and light treatments that are currently performed...
March 2017: International Journal of Women's Dermatology
https://www.readbyqxmd.com/read/28471788/localized-cutaneous-argyria-from-a-nasal-piercing-successfully-treated-with-a-picosecond-755-nm-q-switched-alexandrite-laser
#9
Daniel P Friedmann, Sara Buckley, Vineet Mishra
No abstract text is available yet for this article.
April 28, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28464516/photobiomodulation-therapy-on-wound-treatment-subsequent-to-q-switched-nd-yag-laser-tattoo-removal-in-rat-model
#10
Nada Abusalah Almabrouk Imrigha, Noriah Bidin, Pik Suan Lau, Nurfatin Musa, Nurlaily Zakaria, Ganesan Krishnan
Q-switched Nd: YAG laser is the most effective laser for tattoo removal. Photobiomodulation (PBM) therapy is an alternative method applied to accelerate the wound healing. This paper investigated the effects of PBM therapy using 808 nm diode laser on tattooed skin after laser tattoo removal. Forty-five rats were selected and tattooed with black ink on their dorsal, and then distributed into three groups. G0 was received non-laser irradiation. G1 was treated by laser tattoo removal using 1064 nm with energy density of 3...
May 2, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28463277/tunable-passively-q-switched-thulium-fluoride-fiber-laser-in-the-s-s-band-1450-0-to-1512-0%C3%A2-%C3%A2-nm-region-using-a-single-walled-carbon-nanotube-based-saturable-absorber
#11
H Ahmad, S A Reduan, A Z Zulkifli, Z C Tiu
A tunable passively Q-switched for S+/S band thulium-fluoride fiber (TFF) laser using single-walled carbon nanotubes as a saturable absorber is proposed and demonstrated. The tunability of the proposed laser covers a wavelength region of 1450.0-1512.0 nm, with a range of 62.0 nm. Stable Q-switched operation can be obtained at a pump power of 115.7-229.9 mW at 1492.0 nm. The resulting pulses have a measured repetition rate and pulse width of 12.0-36.4 kHz and 6.2-3.6 μs, respectively. The maximum pulse energy that was achieved in this experiment is 122...
May 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28463269/narrow-linewidth-broadly-tunable-yb-doped-q-switched-fiber-laser-using-multimode-interference-filter
#12
Usha Chakravarty, P K Mukhopadhyay, A Kuruvilla, B N Upadhyaya, K S Bindra
A narrow-linewidth broadly tunable Yb-doped Q-switched fiber laser using an acousto-optic modulator and multimode interference filter (MMIF) in the linear bulk cavity resonator and an all-fiber ring cavity resonator has been demonstrated. Insertion of an MMIF in the linear cavity resonator using bulk components decreased the spectral bandwidth of the Q-switched signal by two orders of magnitude from 11 to less than 0.1 nm. Spectral tunability of more than 16 nm in the range from 1057 to 1073 nm has also been achieved by the combination of MMIF and a standard polarization controller (SPC)...
May 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28454128/2-3-%C3%AE-m-tm-sup-3-sup-ylf-laser-passively-q-switched-with-a-cr-sup-2-sup-znse-saturable-absorber
#13
Ferda Canbaz, Ismail Yorulmaz, Alphan Sennaroglu
We report, what is to our knowledge, the first passively Q-switched operation of a 2.3-μm Tm<sup>3+</sup>:YLF laser by using a Cr<sup>2+</sup>:ZnSe saturable absorber. In the experiments, a tunable Ti<sup>3+</sup>:sapphire laser was used to end pump the Tm<sup>3+</sup>:YLF gain medium inside an x cavity. A Cr<sup>2+</sup>:ZnSe saturable absorber was also included in the cavity to initiate passive Q switching. At all pump power levels above lasing threshold, passively Q-switched operation of the Tm<sup>3+</sup>:YLF laser could be obtained at 2309 nm with pulse durations and repetition frequencies in the ranges of 1...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28437972/integration-of-bow-tie-plasmonic-nano-antennas-on-tapered-fibers
#14
Abdul Khaleque, Evgeny G Mironov, Jonas H Osório, Ziyuan Li, Cristiano M B Cordeiro, Liming Liu, Marcos A R Franco, Jong-Leng Liow, Haroldo T Hattori
In this article, a new and flexible approach to control the electric field enhancement of bow-tie nano-antennas by integrating them on the lateral of a tapered optical fiber is proposed. The device is driven by a Q-switched laser and the performance of a fabricated nano-antenna in a quartz slide is tested by a Surface Enhanced Raman Scattering (SERS) experiment. A refractive index sensing experiment is also performed and a sensitivity of (240 ± 30) nm/RIU is found in the 1.33-1.35 index range.
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28430226/stable-nanosecond-passively-q-switched-all-fiber-erbium-doped-laser-with-a-45%C3%A2-tilted-fiber-grating
#15
Tianxing Wang, Zhijun Yan, Chengbo Mou, Kaiming Zhou, Lin Zhang
Nanosecond passive Q-switching generation from an all-fiber erbium-doped laser with a UV inscribed 45° tilted fiber grating (TFG) is systematically demonstrated. The 45° TFG is employed as a polarizer together with two polarization controllers (PCs) to realize nonlinear polarization rotation (NPR). Because of the NPR effect, stable Q-switched pulses with an average output power of 17.5 mW, a single pulse energy of 72.7 nJ, a repetition rate of 241 kHz, a pulse width of 466 ns, and a signal to noise ratio (SNR) of 58...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429191/melanogenesis-inhibition-in-mice-using-a-low-fluence-1064-nm-q-switched-neodymium-doped-yttrium-aluminum-garnet-laser-a-pilot-study
#16
Jae-Hui Nam, Joon Hong Min, Wang-Kyun Kim, Sunmin Yim, Won-Serk Kim
A low-fluence 1064-nm Q-switched neodymium-doped yttrium aluminum garnet laser, or laser toning, has yielded favorable outcomes in various benign pigmented disorders. However, the exact mechanism of action of laser toning has not been fully elucidated. We sought to determine the inhibitory effect of laser toning on melanogenesis and to assess how laser passes influence the outcomes. To produce perceptible pigmentation, nine HRM-2 melanin-possessing hairless mice were treated with ultraviolet (UV) B radiation on the dorsal skin...
April 20, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28428827/fundamental-research-on-the-action-mechanism-of-the-800-nm-semiconductor-laser-on-skin-blackheads-and-coarse-pores
#17
Jie Lin, Li Jing, Hao Zhu, Fu-Sheng Dong
The aim of the study was to determine the mechanism of action of the 800 nm semiconductor laser on skin blackheads and coarse pores. A total of 24 healthy purebred short-haired male guinea pigs, weighing 350-400 g, were selected and smeared with 0.5 ml coal tar suspension evenly by injector once daily. Treatment was continued for 14 days to form an experimental area of 8×3 cm on the back of the guinea pigs. The animals were divided into the following groups: Normal control group (NC), low-dose laser treatment group (L-LS), high-dose laser treatment group (H-LS), and Q-switched Nd:YAG treatment group (QC)...
January 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28418076/ultrasonic-modulation-of-tissue-optical-properties-in-ex-vivo-porcine-skin-to-improve-transmitted-transdermal-laser-intensity
#18
Paul J D Whiteside, Chenxi Qian, Nicholas Golda, Heather K Hunt
BACKGROUND AND OBJECTIVE: Applications of light-based energy devices involving optical targets within the dermis frequently experience negative side-effects resultant from surface scattering and excess optical absorption by epidermal melanin. As a broadband optical absorber, melanin decreases the efficacy of light-based treatments throughout the ultraviolet, visible, and near-infrared spectra while also generating additional heat within the surface tissue that can lead to inflammation or tissue damage...
April 18, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28414350/cr-zns-saturable-absorber-passively-q-switched-mode-locking-tm-ho-llf-laser
#19
Xinlu Zhang, Yong Luo, Tianhan Wang, Junfeng Dai, Jianxin Zhang, Jiang Li, Jinhui Cui, Jinjer Huang
We first report on a diode-end-pumped passively Q-switched mode-locking Tm,Ho:LLF laser at 2053 nm by using a Cr:ZnS saturable absorber. A stable Q-switched mode-locking pulse train with a nearly 100% modulation depth was achieved. The repetition frequency of the Q-switched pulse envelope increased from 0.5 to 12.3 kHz with increasing pump power from 1 to 4.36 W. The maximum average output power of 145 mW was obtained, and the width of the mode-locked pulse was estimated to be less than 682 ps with a 250 MHz repetition frequency within a Q-switched pulse envelope of about 700 ns...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414343/effect-of-hydrocarbon-molecular-decomposition-on-palladium-assisted-laser-induced-plasma-ablation
#20
Alireza Moosakhani, Parviz Parvin, Seyedeh Zahra Mortazavi, Ali Reyhani, Shariar Abachi
The Q-switched Nd:YAG laser is focused on a palladium target in the control chamber filled with various hydrocarbon atmospheres (C1-C4) to investigate their effect on the palladium ablated mass, gas reaction products, and corresponding plasma parameters (such as electron density N<sub>e</sub> and plasma temperature T<sub>e</sub>) during molecular decomposition. The plasma parameters arise mainly from the Pd nanocatalytic activity during the laser-induced plasma process. We compare synthetic air atmosphere to hydrocarbon media to understand how the latter generates excess heat via oxygen-free exothermic (recombination) reactions...
April 10, 2017: Applied Optics
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