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q switched laser

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
Haifeng Lin, Wenzhang Zhu, Feibing Xiong, Jianjian Ruan
We report a continuous-wave dual-wavelength Nd:YAG laser at 1052 and 1073 nm, for the first time to the best of our knowledge, in free-running mode. The maximum output power reaches 6.64 W with slope efficiency of about 42.1% with respect to the absorbed power. Inserting a Cr:YAG saturable absorber, the dual-wavelength laser can operate in the Q-switching regime with maximum average output power of 880 mW. The minimum pulse width and the highest pulse repetition rate are 28 ns and 17.12 kHz, respectively. The dual-wavelength laser has potential to generate a 5...
February 1, 2017: Applied Optics
Hui-Yu Lin, Wen-Song Li, Jing-Long Lan, Xiao-Feng Guan, Hui-Ying Xu, Zhi-Ping Cai
We experimentally demonstrated a simple passively Q-switched praseodymium (Pr<sup>3+</sup>)-doped all-fiber laser at 604 nm with a Bi<sub>2</sub>Se<sub>3</sub> saturable absorber (SA). A Bi<sub>2</sub>Se<sub>3</sub>/polyvinyl alcohol composite film is sandwiched between two ferrules to construct a fiber-compatible Q-switcher. Two fiber end facet mirrors build a compact-linear resonator. The repetition rate of the achieved 604 nm Q-switching pulse can be widely tuned from 86...
February 1, 2017: Applied Optics
Christian Weingarten, Emrah Uluz, Andreas Schmickler, Karsten Braun, Edgar Willenborg, André Temmler, Sebastian Heidrich
Recent results of processing fused silica using a high-power Q-switched CO<sub>2</sub> laser source with a maximum output power of 200 W are presented. Compared to the processing with continuous wave laser radiation, the main advantage of pulsed laser radiation is the influence of the light-matter interaction with high laser peak power at small average laser power. An application for the approach presented in this paper is the flexible manufacturing and form correction of optics. This laser-based process is nearly independent of the surface geometry and can even be enhanced by laser polishing and expanded to other glass materials...
February 1, 2017: Applied Optics
Yunzheng Wang, Liqiang Zhang, Zhuang Zhuo, Songzhen Guo, Dong Wei, Guixia Tian
An all-normal dispersion fiber laser mode-locked by nonlinear polarization evolution is presented in this paper. A magneto-optical polarization controller is employed in a fiber laser to optimize the polarization state and mode-locking operation. In order to provide an adjustable and large enough magnetic field for magneto-optical crystals, a magnetic yoke is designed with silicon steel and copper coil. The Q-switched and continuous-wave mode-locking regime of the fiber laser are investigated experimentally...
January 20, 2017: Applied Optics
Ju-Yeon Choi, Hyun-Min Seo, Won-Serk Kim
Median canaliform nail dystrophy is an uncommon and idiopathic dystrophic change, typically appears as central, longitudinal groove or split involving one or both thumbnails. Various treatments including potent topical steroid, an intralesional injection of triamcinolone 2.5 to 3 mg/dL, medications for systemic treatment, and topical psoralen plus ultraviolet A (PUVA) have been tried to treat the disease. However, each treatment has limitations including severe pain, inconsistent treatment results, long treatment periods, and dissatisfaction with effects of treatment...
January 31, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
K Hutton Carlsen, J Esmann, J Serup
BACKGROUND: Tattoo removal by Q-switched lasers is golden standard; however, clients' satisfaction with treatment is little known. OBJECTIVE: To determine clients' satisfaction with tattoo removal. METHODS: 154 tattoo removal clients who had attended the private clinic "Centre for Laser Surgery", Hellerup, Denmark from 2001-2013 completed a questionnaire concerning outcome expectations, level of pain experiences and satisfaction with tattoo removal...
January 20, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
Nevil Khurana, Christine Urman
Macular amyloidosis typically presents as small, dusky-brown or greyish pigmented macules, the result of altered keratin deposition. Treatment of these hyperpigmented regions with topical and systemic therapies remains challenging, however Q-Switched neodymi- um-doped yttrium aluminum garnet (ND:YAG) laser has proven to be an effective treatment modality to reduce hyperpigmentation. In this case report we investigated the ef cacy of Q-Switched Nd:YAG laser treatment on a 34-year old woman with recalcitrant macular amyloidosis who failed to respond to over-the-counter bleaching creams...
November 1, 2016: Journal of Drugs in Dermatology: JDD
Josef Haik, Rachel Kornhaber, Moti Harats, Hadar Israeli, Arie Orenstein
INTRODUCTION: Q-switched neodymium:YAG (Nd:YAG) lasers are reported to be gold standard for laser tattoo removal. In particular, the Q-switched Nd:YAG laser at 1064 nm is widely recognized for the removal of blue/black amateur tattoos. However, treatment modalities in Fitzpatrick Type VI skin carry a greater risk of complications including alterations in pigmentation compared to fairer skin (Fitzpatrick Type I-IV skin). Therefore, the aim of this case series was to describe with the use of the Q-Switched Nd:YAG laser, the removal of carbon-based amateur tattoos on patients with Fitzpatrick Type VI skin as an effective and safe method...
November 1, 2016: Journal of Drugs in Dermatology: JDD
Girish Munavalli
Recent appreciation of the multifactorial pathophysiology of skin aging has led to increased use of parallel treatment regimens. This prospective, split-face, randomized study assessed the safety and efficacy of same-day sequential Q-switched Nd:YAG laser and 1565 nm non-ablative fractional laser (SST) facial rejuvenation treatment in comparison to fractional non-ablative laser (NAFL) treatment only. Seventeen patients underwent three treatment sessions, conducted at 4-6-week intervals, in which SST treatment was delivered on a randomly selected side of the face followed by NAFL treatment on the contralateral side immediately thereafter...
November 1, 2016: Journal of Drugs in Dermatology: JDD
Mingqi Fan, Tao Li, Guiqiu Li, Houyi Ma, Shengzhi Zhao, Kejian Yang, Christian Kränkel
The saturable absorption properties of few-layer graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) nanosheets near 3 μm were investigated. A stable Q-switched Er:Lu<sub>2</sub>O<sub>3</sub> laser at 2.84 μm was realized by using a home-made g-C<sub>3</sub>N<sub>4</sub> saturable absorber (SA), generating a pulse duration of 351 ns and an average output power of 1.09 W at a repetition rate of 99 kHz, corresponding to a pulse energy of 11...
January 15, 2017: Optics Letters
Qiyao Liu, Bin Zhang, Sisheng Qi, Yaocheng Li, Xuliang Fan, Yongguang Zhao, Wei Zhou, Deyuan Shen
Using a home-made black phosphorus plate (BPP) as handedness controller and Q-switch modulator synchronously, a ~1.6 µm pulsed vortex laser with well-determined handedness is demonstrated in this letter. Stable vortex pulses of LG<sub>0, + 1</sub>, LG<sub>0,-1</sub>, LG<sub>0, + 2</sub> and LG<sub>0,-2</sub> modes were respectively achieved from compact resonant cavities in this experiment. Such pulsed vortex laser should have promising applications in various fields based on its simple structure, controllable handedness, and carried orbital angular momentum...
December 26, 2016: Optics Express
H Cheng, W Lin, T Qiao, S Xu, Z Yang
With increasing demand on a laser source in the gigahertz pulse repetition rate regime, clarification on the mechanism of instability in high repetition rate fiber lasers - a promising alternative to solid state lasers - is of great importance and can potentially offer guideline for continuous wave (CW) mode locking. Here we present a theoretical approach together with relevant experimental corroboration to analyze the instabilities. By means of appropriate approximations, regimes from Q-switched mode locking, CW mode locking and pulsation are theoretically identified...
December 26, 2016: Optics Express
E Petronijevic, C Sibilia
Electromagnetically induced transparency (EIT) is a pump-induced narrowband transparency window within an absorption line of the probe beam spectrum in an atomic system. In this paper we propose a way to bring together the all-dielectric metamaterials to have EIT-like effects and to optically tune the response by hybridizing them with a layer of a phase change material. We propose a design of the metamaterial based on Si nanoresonators that can support an EIT-like resonant response. On the top of the resonators we consider a thin layer of a chalcogenide phase change material, which we will use to tune the optical response...
December 26, 2016: Optics Express
Jingjing Liu, Jie Liu, Zhinan Guo, Han Zhang, Weiwei Ma, Jingya Wang, Liangbi Su
An efficient Er:SrF<sub>2</sub> crystal, lightly Er-doped to a concentration of 4at.%, was successfully grown by the traditional Bridgman method and displayed excellent spectral properties. A diode-end-pumped passively Q-switched dual-wavelength laser, operating at 2.79 μm wavelength, was demonstrated with this crystal by using black phosphorus as the saturable absorber (BP-SA). In the compact passively Q-switched Er:SrF<sub>2</sub> laser, the maximum average output power of 180 mW was achieved at an absorbed pump power of 2...
December 26, 2016: Optics Express
Spela Stunf Pukl, Brigita Drnovšek-Olup
PURPOSE: To evaluate the efficacy of selective laser trabeculoplasty (SLT) to lower intraocular pressure (IOP) in patients with primary open-angle glaucoma (POAG), normal tension glaucoma (NTG) or ocular hypertension (OHT), when performed with laser pulse duration of 1 ns compared with standard 3-5 ns. METHODS: Bilateral SLT with a 532 nm Q-switched neodymium-doped yttrium aluminium garnet laser was conducted in 30 patients (60 eyes) with POAG (n = 5), NTG (n = 2) or OHT (n = 23)...
December 31, 2016: International Ophthalmology
Sargis Hakobyan, Valentin J Wittwer, Kore Hasse, Christian Kränkel, Thomas Südmeyer, Thomas Calmano
In this Letter, we present high-power continuous wave (CW) and Q-switched femtosecond laser-written Yb:YAG channel waveguide lasers. In Q-switched operation, obtained by a semiconductor saturable absorber mirror (SESAM), as well as in CW operation, the laser generates average output powers of more than 5.6 W and reaches slope efficiencies above 74%. The Q-switched laser operated at a maximum repetition rate of 5.4 MHz with a minimum pulse duration of 11 ns, and with a maximum pulse energy of 1 μJ. This laser has almost an order of magnitude higher average output power than previously reported Q-switched channel waveguide lasers...
October 15, 2016: Optics Letters
Jingjing Liu, Xiuwei Fan, Jie Liu, Weiwei Ma, Jingya Wang, Liangbi Su
A diode-end-pumped self-Q-switched mid-infrared laser was demonstrated with Er<sup>3+</sup>, Pr<sup>3+</sup> co-doped CaF<sub>2</sub> crystal for, to the best of our knowledge, the first time. Maximum average output power of 262 mW was achieved and the corresponding slope efficiency was 14.9%. Stable self-Q-switched laser pulses as short as 718 ns were obtained with a repetition rate of 52.63 kHz at the center wavelength of 2803.7 nm. This highly compact nanosecond laser using a 3 at...
October 15, 2016: Optics Letters
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