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Nd Yag laser

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https://www.readbyqxmd.com/read/29053541/commentary-on-long-pulsed-nd-yag-laser-treatment-for-nail-psoriasis
#1
Thomas Knackstedt, Nathaniel J Jellinek
No abstract text is available yet for this article.
October 19, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/29048058/extra-cavity-radiofrequency-modulator-for-a-lidar-radar-designed-for-underwater-target-detection
#2
Nour Alem, Fabrice Pellen, Guy Le Brun, Bernard Le Jeune
The hybrid lidar-radar technique is commonly used for shallow underwater target detection. This technique requires a powerful blue-green RF-modulated laser with stable microwave frequency. In this paper, a novel modulator design perfectly suited for this application is proposed. It consists of an extra-cavity modulator composed of two plane mirrors and a second-harmonic generator stage within the cavity to maximize the energy efficiency. This modulator is coupled with a picosecond Nd:YAG infrared laser source to insure the emission of a powerful pulse (up to 5 mJ)...
September 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047850/1%C3%A2-%C3%A2-khz-96%C3%A2-%C3%A2-w-pulse-burst-picosecond-laser-system-with-six-equal-spacing-and-amplitude-pulses
#3
Ming Liang Long, G Li, Meng Chen
An average power of 96 W pulse-bursts picosecond laser system at a pulse repetition frequency of 1 kHz was reported with six pulses in bursts. Pulses in bursts have equal spacing and amplitude; spacing between each pulse was 800 ps, which repetition rate was up to gigahertz. The beam quality of M(2) factor was less than 3, and pulse width was 50 ps. Pulses from a Nd:YVO4 mode-locked laser were broadened to 115 ps by a volume-Bragg grating and each pulse was divided into six pulses by beam splitter mirrors to obtain seed bursts...
May 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047805/phase-matching-properties-of-ligase2-for-shg-and-sfg-in-the-1-026-10-5910%C3%A2-%C3%AE-m-range
#4
Kentaro Miyata, Valentin Petrov, Kiyoshi Kato
This paper reports on the new experimental results for second-harmonic generation and sum-frequency generation in LiGaSe2 in the 1.026-10.5910 μm range, and the improved Sellmeier equations that provide a good reproduction of the present experimental results, as well as the published data points for a Ti:Al2O3 laser (λ=0.8200  μm)-pumped optical parametric amplifier and a Nd:YAG laser-pumped optical parametric oscillator in the mid-IR.
August 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047762/analysis-of-charcoal-blast-furnace-slags-by-laser-induced-breakdown-spectroscopy
#5
Chet R Bhatt, Christian L Goueguel, Jinesh C Jain, Harry M Edenborn, Dustin L McIntyre
Laser-induced breakdown spectroscopy (LIBS) was used for the analysis of charcoal blast furnace slags. Plasma was generated by an application of a 1064 nm wavelength Nd:YAG laser beam to the surface of pellets created from the slags. The presence of Al, Ca, Fe, K, Mg, Mn, and Si was determined by identifying their characteristic spectral signatures. Multivariate analysis was performed for the quantification of these elements. The predicted LIBS results were found in agreement with the inductively coupled plasma optical emission spectrometry analysis...
October 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047684/development-of-a-compact-underwater-laser-induced-breakdown-spectroscopy-libs-system-and-preliminary-results-in-sea-trials
#6
Jinjia Guo, Yuan Lu, Kai Cheng, Jiaojian Song, Wangquan Ye, Nan Li, Ronger Zheng
The exploitation and research of deep-sea hydrothermal vent has been an issue of great interest in ocean research in recent years. Laser-induced breakdown spectroscopy (LIBS) has great potential for ocean application due to the capabilities of stand-off, multiphase, and multielement analysis. In this work, a newly developed compact 4000 m rated LIBS system (LIBSea) is introduced with preliminary results of sea trials. The underwater system consists of an Nd:YAG single-pulsed laser operating at 1064 nm, an optical fiber spectrometer, an optics module, and an electronic controller module...
October 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047677/simultaneous-analysis-of-cr-and-pb-in-contaminated-pork-by-laser-induced-breakdown-spectroscopy
#7
Mingyin Yao, Gangfu Rao, Lin Huang, Muhua Liu, Hui Yang, Jinyin Chen, Tianbing Chen
Laser-induced breakdown spectroscopy (LIBS) as a rapid and green method was used to detect heavy metals Cr and Pb in pork contaminated in the lab. The laser-induced plasma was generated by a Q-switched Nd:YAG laser, and the LIBS signal was collected by a spectrometer with a charge-coupled device detector. The traditional calibration curves (CC) and multivariate partial least squares (PLS) algorithm were applied and compared to validate the accuracy in predicting the content of heavy metals in samples. The results demonstrated that the correlation coefficient of CC is poor by the classical univariate calibration method, so the univariate calibration analysis cannot effectively serve the quantitative purpose in analyzing heavy metals' residue in pork with a complex matrix...
October 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047553/laser-characteristics-of-nd-3-doped-calcium-barium-niobate-ferroelectric-crystal-at-1-06-and-1-34%C3%A2-%C3%A2-%C3%AE-m
#8
Jinglong Lan, Xiaoxu Huang, Xiaofeng Guan, Bin Xu, Huiying Xu, Zhiping Cai, Xiaodong Xu, Dongzhen Li, Jun Xu
We report on diode-pumped Nd(3+)-doped calcium barium niobate ferroelectric crystal (Nd:CBN-28) lasers at 1.06 and 1.34 μm. The maximum output power of the 1.06 μm laser reaches 0.69 W in the continuous-wave regime, which is believed to be the highest output power with Nd:CBN-28 crystal to date. Using a chopper to modulate the pump, the highest output power further improves to 0.77 W. Passively Q-switched laser operation at 1.06 μm, using a Cr:YAG saturable absorber, is realized with a maximum average output power of 89 mW, a pulse width of 220 ns, and a pulse energy 10...
May 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047001/in-vitro-bond-strength-of-an-epoxy-resin-based-root-canal-sealer-to-root-dentin-irradiated-with-high-power-lasers-and-adhesive-interface-analyses
#9
Vanessa Lessa C Araujo, Pedro Basto Cruvinel, Regina Guenka Palma-Dibb, Ricardo Gariba-Silva
The aim of this study was to evaluate in vitro the influence of high-power lasers (Nd:YAG and diode 980 nm) associated with mineral coal as fotopotencializer on bond strength of an epoxy resin-based root canal sealer to root dentin, using the pushout test, and on the dentin/filling material interface, using confocal laser microscopy. For this purposes, 50 canines were instrumented with Mtwo rotary system up to #50.04 instrument and randomly assigned to five groups (n = 10): group I-control EDTAC; group II-EDTAC and Nd:YAG laser; group III-EDTAC and diode laser 980 nm; group IV-EDTAC, Nd:YAG laser and mineral coal 5 g/100 mL; and group V-EDTAC, diode laser 980 nm and mineral coal 5 g/100 mL...
October 18, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29042724/evaluation-of-bond-strength-between-grooved-titanium-alloy-implant-abutments-and-provisional-veneering-materials-after-surface-treatment-of-the-abutments-an-in-vitro-study
#10
Gowtham Venkat, Murugesan Krishnan, Suganya Srinivasan, Muthukumar Balasubramanian
INTRODUCTION: Titanium has become the material of choice with greater applications in dental implants. The success of the dental implant does not only depend on the integration of the implant to the bone but also on the function and longevity of the superstructure. The clinical condition that demands long-term interim prosthesis is challenging owing to the decreased bond between the abutment and the veneering material. Hence, various surface treatments are done on the abutments to increase the bond strength...
July 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29041664/diode-pumped-passively-q-switched-self-frequency-doubled-nd-cngs-laser
#11
Xuzhao Zhang, Ying Zhou, Anatol Yasukevich, Pavel Loiko, Xavier Mateos, Xinguang Xu, Shiyi Guo, Zhengping Wang
With Cr(4+):YAG as a saturable absorber, a passively Q-switched self-frequency-doubled (SFD) laser based on a trigonal Nd:Ca3NbGa3Si2O14 (Nd:CNGS) silicate crystal was demonstrated for the first time. The maximum average output power at 532 nm was 16.2 mW, and the corresponding pulse repetition frequency, single pulse energy, pulse duration and peak power were 2.25 kHz, 7.2 μJ, 13.7 ns, 0.53 kW, respectively. We also present a rate-equation model of such a passively Q-switched SFD laser showing a good agreement with the experiment...
August 21, 2017: Optics Express
https://www.readbyqxmd.com/read/29041586/high-power-and-highly-efficient-composite-laser-with-an-anti-reflection-coated-layer-between-a-laser-crystal-and-a-diamond-heat-spreader-fabricated-by-room-temperature-bonding
#12
Hiromasa Ichikawa, Kohki Yamaguchi, Tomo Katsumata, Ichiro Shoji
We have succeeded in bonding a Nd:YAG crystal and an anti-reflection coated diamond crystal to realize a composite laser which minimizes the Fresnel-reflection loss at the bonded interface for the first time. This newly developed composite laser has realized higher output power at higher pump power than a non-composite Nd:YAG laser while keeping nearly the same slope efficiency.
September 18, 2017: Optics Express
https://www.readbyqxmd.com/read/29041536/nonlinear-beam-self-cleaning-in-a-coupled-cavity-composite-laser-based-on-multimode-fiber
#13
R Guenard, K Krupa, R Dupiol, M Fabert, A Bendahmane, V Kermene, A Desfarges-Berthelemot, J L Auguste, A Tonello, A Barthélémy, G Millot, S Wabnitz, V Couderc
We study a coupled cavity laser configuration where a passively Q-switched Nd:YAG microchip laser is combined with an extended cavity, including a doped multimode fiber. For appropriate coupling levels with the extended cavity, we observed that beam self-cleaning was induced in the multimode fiber thanks to nonlinear modal coupling, leading to a quasi-single mode laser output. In the regime of beam self-cleaning, laser pulse duration was reduced from 525 to 225 ps. We also observed a Q-switched mode-locked operation, where spatial self-cleaning was accompanied by far-detuned nonlinear frequency conversion in the active multimode fiber...
September 18, 2017: Optics Express
https://www.readbyqxmd.com/read/29041513/946-nm-nd-yag-double-q-switched-laser-based-on-monolayer-wse2-saturable-absorber
#14
Yanxiao Sun, Yang Bai, Diao Li, Lei Hou, Bing Bai, Yuze Gong, Leilei Yu, Jintao Bai
In this paper, we report a 946nm double Q-switched laser side pumped by an 808-nm pulse laser diode (LD). A layered tungsten diselenide (WSe2) saturable absorber (SA) together with an MgO doped LiNbO3 electro-optic (EO) modulator is applied to double Q-switch the Nd: YAG laser, producing trains of nanosecond-duration pulses with 500 Hz repetition rate. Such WSe2 saturable absorbers are fabricated by chemical vapor deposition (CVD) in a hot wall chamber and then embedded into a resonant mirror. The achieved pulse energy of double Q-switched laser at 946 nm is approximately 2...
September 4, 2017: Optics Express
https://www.readbyqxmd.com/read/29041488/12-j-10-hz-diode-pumped-nd-yag-distributed-active-mirror-amplifier-chain-with-ase-suppression
#15
Tinghao Liu, Zhan Sui, Lin Chen, Zhupeng Li, Qiang Liu, Mali Gong, Xing Fu
Experimental amplification of 10-ns pulses to an energy of 12.2 J at the repetition rate of 1-10 Hz is reported from a diode-pumped room-temperature distributed active mirror amplifier chain (DAMAC) based on Nd:YAG slabs. Efficient power scaling at the optical-optical efficiency of 20.6% was achieved by suppressing the transverse parasitic oscillation with ASE absorbers. To the best of our knowledge, this is the first demonstration of a diode-pumped Nd:YAG active-mirror laser with nanosecond pulse energy beyond 10 joules...
September 4, 2017: Optics Express
https://www.readbyqxmd.com/read/29041358/sub-23-%C3%AE-hz-instantaneous-linewidth-and-frequency-stability-measurements-of-the-beat-note-from-an-offset-phase-locked-single-frequency-heterodyned-nd-yag-laser-system
#16
D A Tulchinsky
We report, what is to the best of our knowledge, the narrowest instantaneous linewidth measurement of the beat frequency between two phase locked heterodyned 1.319 μm Nd:YAG lasers. At both 65 kHz and 31.7 GHz beat frequencies, we measured the instantaneous 3 dB linewidth of the optically-generated microwave tones to be < 22.8 μHz, limited only by the minimum instrument resolution. Allan deviation measurements indicate that the laser system follows a 5 MHz quartz reference oscillator to stability levels of σy (1s) = 8...
October 2, 2017: Optics Express
https://www.readbyqxmd.com/read/29041303/laser-emission-from-flash-ignition-of-zr-al-nanoparticles
#17
Fan Yang, Xiaoli Kang, Jiangshan Luo, Laixi Sun, Handing Xia, Zao Yi, Yongjian Tang
We report the first laser emission from flash ignition of Zr/Al nanoparticles with the addition of strong oxidizer KClO4 using Nd: YAG as a laser medium. The mixture Zr/Al/Kp-45 (mass ratio = 33%Zr: 33%Al: 34%KClO4) has the highest brightness temperature Tb = 4615 K and the adiabatic flame temperature Tf = 4194 K with the duration of 20 ms. At 1064 nm we measured a maximum output energy of 702.5 mJ with the duration of nearly 10 ms by using only 100 mg mixture with an output coupler (transmission T = 10%). Further optimizing the concentration cavity and increasing the mixture content will yield much higher efficiency and output energy...
October 2, 2017: Optics Express
https://www.readbyqxmd.com/read/29041153/cladding-like-waveguide-fabricated-by-cooperation-of-ultrafast-laser-writing-and-ion-irradiation-characterization-and-laser-generation
#18
Jinman Lv, Zhen Shang, Yang Tan, Javier Rodríguez Vázquez de Aldana, Feng Chen
We report the surface cladding-like waveguide fabricated by the cooperation of the ultrafast laser writing and the ion irradiation. The ultrafast laser writes tracks near the surface of the Nd:YAG crystal, constructing a semi-circle columnar structure with a decreased refractive index of - 0.00208. Then, the Nd:YAG crystal is irradiated by the Carbon ion beam, forming an enhanced-well in the semi-circle columnar with an increased refractive index of + 0.0024. Tracks and the enhanced-well consisted a surface cladding-like waveguide...
August 7, 2017: Optics Express
https://www.readbyqxmd.com/read/29041124/wavefront-improvement-in-an-end-pumped-high-power-nd-yag-zigzag-slab-laser
#19
Jae Sung Shin, Yong-Ho Cha, Gwon Lim, Yonghee Kim, Seong-Ouk Kwon, Byung Heon Cha, Hyeon Cheor Lee, Sangin Kim, Kwang Uoong Koh, Hyun Tae Kim
Techniques for wavefront improvement in an end-pumped Nd:YAG zigzag slab laser amplifier were proposed and demonstrated experimentally. First, a study on the contact materials was conducted to improve the heat transfer between the slab and cooling blocks and to increase the cooling uniformity. Among many attempts, only the use of silicon oil showed an improvement in the wavefront. Thus, the appropriate silicone oil was applied to the amplifier as a contact material. In addition, the wavefront compensation method using a glass rod array was also applied to the amplifier...
August 7, 2017: Optics Express
https://www.readbyqxmd.com/read/29039965/scanning-electron-microscope-comparative-surface-evaluation-of-glazed-lithium-disilicate-ceramics-under-different-irradiation-settings-of-nd-yag-and-er-yag-lasers
#20
Josko Viskic, Drazen Jokic, Suzana Jakovljevic, Lana Bergman, Sladana Milardovic Ortolan, Senka Mestrovic, Ketij Mehulic
OBJECTIVE: To evaluate the surface of glazed lithium disilicate dental ceramics after irradiation under different irradiation settings of Nd:YAG and Er:YAG lasers using a scanning electron microscope (SEM). MATERIALS AND METHODS: Three glazed-press lithium disilicate ceramic discs were treated with HF, Er:YAG, and Nd:YAG, respectively. The laser-setting variables tested were laser mode, repetition rate (Hz), power (W), time of exposure (seconds), and laser energy (mJ)...
October 17, 2017: Angle Orthodontist
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