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Surface modifications of biometallic commercially pure Ti and Ti–13Nb–13Zr alloy by picosecond nd:yag laser

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 285-295页

作者： Slađana Laketić Marko Rakin MilošMomčilović Jovan Ciganović Đorđe Veljović Ivana Cvijović-Alagić Vinča Institute of Nuclear Sciences University of BelgradeP.O.Box 52211001 BelgradeSerbia Faculty of Technology and Metallurgy University of BelgradeKarnegijeva 411120 BelgradeSerbia

The effects of picosecond nd:yag laser irradiation on chemical and morphological surface characteristics of the commercially pure titanium and Ti–13Nb–13Zr alloy in air and argon atmospheres were studied under different laser output energy values.During the interaction of laser irradiation with the investigated materials,a part of the energy was absorbed on the target surface,influencing surface modifications.laser beam interaction with the target surface resulted in various morphological alterations,resulting in crater formation and the presence of microcracks and hydrodynamic structures.Moreover,different chemical changes were induced on the target materials’surfaces,resulting in the titanium oxide formation in the irradiation-affected area and consequently increasing the irradiation energy absorption.Given the high energy absorption at the site of interaction,the dimensions of the surface damaged area increased.Consequently,surface roughness increased.The appearance of surface oxides also led to the increased material hardness in the surface-modified area.Observed chemical and morphological changes were pronounced after laser irradiation of the Ti–13Nb–13Zr alloy surface.

关键词： commercially pure titanium Ti-13Nb-13Zr alloy surface modification nd:yag laser laser-induced damage hard oxidized surface

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Generation of 2.1 W Continuous Wave Blue Light by Intracavity Doubling of a Diode-End-Pumped nd：yag laser in a 30 mm LBO

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Chinese Physics Letters 2006年第6期23卷 1479-1481页

作者：陈亚辉侯玮彭海波耿爱丛周勇崔大复许祖彦 Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 Graduate School of the Chinese Academy of Sciences Beijing 100080

A folded four-mirror cavity with a composite nd：yag rod is optimized to obtain high efficient cw 473nm blue output. The laser could operate stably in the region of the thermal-lens focal length from 20mm to 70mm. LBO is used for intracavity frequency doubling of the 946nm transition of nd：yag and the optimum LBO length is investigated. A maximum output power of 2.1 Win the blue spectral range at 473nm is achieved with 30-mm-long LBO, corresponding to an optical conversion efficiency of 9.1%.

关键词： Wave Blue Light iode-End-Pumped nd:yag laser

Diode—Pumped Compact cw Frequency—Doubled nd：yag laser in the watt Range at 473nm

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Chinese Physics Letters 2003年第7期20卷 1064-1066页

作者：李平雪李德华张治国张世文 LaboratoryofOpticalphysics InstituteofphysicschineseAcademyofSciencesBeijing100080 NorthChinaResearchInstituteofElectro-Optics Beijing100015

We report a diode-pumped cw nd:yag laser operating on the 4F3/2-4I9/2 transition at 946nm, for which a maximum output power of 4.5W with a slope efficiency of 21% is achieved at an incident pump power of 26W. Two LiB3O5 (LBO) crystals of different lengths (3×3×10mm and 3×3×15mm), cut for critical type I phase matching at room temperature, have been used for intracavity frequency doubling, and through optimization of the structure and elements of the cavity, a maximum single-ended blue output power of 1.1W has been obtained with an optical conversion efficiency of 4.2%. A stability better than 4.8% with no mode hopping over a period of 2h has been achieved.

关键词： Diode-Pumped Frequency-Doubled nd:yag laser Watt Range 473 nm

Three-nanosecond-equal interval sub-pulse nd:yag laser with multi-step active Q-switching

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Chinese Optics Letters 2021年第7期19卷 43-47页

作者：毛洁王超洪梯翔于永吉 Jilin Key Laboratory of Solid laser Technology and Application School of ScienceChangchun University of Science and TechnologyChangchun 130022China

We demonstrate a three-nanosecond equidistant sub-pulse multi-step Q-switched nd:Y3 Al5 O12(nd:yag) laser.In the time interval of 100–1000 ns, three pulses with the same nanosecond interval and the same peak power are obtained at the pulse width of 24 ns, 28 ns, and 36.6 ns, respectively.The energy is 32.5 m J, and the optical efficiency is 10.8%.The multi-step Q-switched method does not require the insertion of other optical elements into the traditional Q-switched laser, and it is very suitable to obtain pulse group output with several nanosecond pulse intervals.

关键词： nanosecond interval pulse multi-step Q-switching nd:yag laser

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nd: yag laser iridotomy in Shaffer-Etienne grade 1 and 2: angle widening in our case studies

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International Journal of Ophthalmology(English edition) 2015年第4期8卷 709-713页

作者： Sandra Cinzia Carlesimo Luigi Di Santo Pietro Bruni Aloisa Librando Antonietta Pompea Falace Andrea Barbato Department of Sense Organs Sapienza University of Rome Freelance Scientific Designer

·AIM: To obtain widening of a potentially occludable angle, in according to Kanski’s indications, through preventive nd:yag laser iridotomy. The observational study was performed by using gonioscopy for the selection and follow-up of 1165 treated eyes and exploiting Shaffer-Etienne gonioscopic classification as a quality/quantity test of the angle recession.·METHODS: Between September 2000 and July 2012,586 patients were selected at the Outpatients’ Ophthalmological Clinic of the Policlinico Umberto I of Rome in order to undergo nd: yag laser iridotomy. A Goldmann type contact lens, Q-switched mode, 2-3defocus, and 7-9 m J intensity with 2-3 impulse discharges were used for surgery.·RESULTS: From as early as the first week, a whole360° angle widening were evident in the patients, thus showing the success of nd:yag laser iridotomy in solving relative pupil block. The angle remained narrow by 270° in 14 eyes only, despite repetitions of further treatment with laser iridotomy in a different part of the iris, twice in 10 eyes and three times in 4 eyes.·CONCLUSION: nd:yag laser iridotomy revealed itself as being a safe and effective treatment in widening those critical Shaffer-Etienne grade 1 and 2 potentially occludable angles.

关键词： glaucoma gonioscopy intraocular pressure iridotomy narrow angle nd:yag laser

Efficacy and Safety of Alexandrite and nd:yag laser Combination in Permanent Hair Removal

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International Journal of Clinical Medicine 2023年第9期14卷 419-427页

作者： Şule Gençoğlu Department of Dermatology Private G&oumlzde Akademi Hospital Malatya Türkiye

Background and Objective: Unwanted hair growth is a discomforting issue affecting both genders. People have tried various methods to get rid of this situation. This study aims to evaluate the efficacy and safety of a combined Alexandrite and nd:yag laser treatment for permanent hair removal, drawing insights from existing literature. Materials and Methods:This study included a total of 2127 patients (302 males, 1825 females) aged 18 - 65, with complete data, who underwent hair removal treatment between December 2018 and April 2021. These patients were treated using the Duetta laser system (Quanta system, Samarate, Italy), combining Alexandrite 755 nm and nd:yag 1064 nm wavelengths. The patients’ skin types were classified according to the Fitzpatrick classification scale. Target area/areas for laser hair removal was/were determined. laser parameters, pulse counts, pain levels assessed through the Visual Pain Scale (VPS), and patient satisfaction were documented based on skin types. Findings: Across various skin types, Types I - II exhibited the highest treatment success rates (87%), with the axillary region achieving the highest rate (83%) and the face region achieving the lowest rate (75%). Pain scale analysis indicated that 98% of patients tolerated the procedure well. Patient satisfaction levels exceeded 90%. Evaluation of complication rates revealed minimal occurrences. Conclusion: The combined Alexandrite and nd:yag laser system demonstrates both efficacy and safety across diverse skin types, attributed to its notable success rates, minimal adverse effects, and high patient tolerance.

关键词： laser Hair Removal Alexandrite laser nd:yag laser

A　High　Efficient　Stable　Intracavity　Doubling　nd：yag　laser　Pumped　by　a　laser　Diode

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Chinese Journal of lasers 1995年第4期4卷 295-300页

作者： ZHANG Kuanshou XIE Changde GUO Ringxiang PENG Kunchi(Institute of Opto- electronics ,Shanxi University,Taiyuan 030006) Shanxi Univ Taiyuan China

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关键词： intracavity harmonic nd:yag laser LD pumped laser

1.15kW continuous-wave generation by diode-side-pumped two-rod nd：yag laser

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Chinese Physics B 2005年第4期14卷 771-773页

作者：薄勇耿爱丛毕勇孙志培杨晓冬彭钦军李惠青李瑞宁崔大复许祖彦 BeijingNationalLaboratoryforCondensedMatterPhysics InstituteofPhysicsChineseAcademyofSciencesBeijing100080China BeijingNationalLaboratoryforCondensedMatterPhysics InstituteofPhysicsChineseAcademyofSciencesBeijing100080China//GraduateSchooloftheChineseAcademyofSciencesBeijing100080China AcademyofOpto-electronics ChineseAcademyofSciencesBeijing100080China

A high power and high efficiency laser head with five dual-line diode arrays for the side-pumped nd:yag rod is developed. By mounting two laser heads of this kind and a quartz 90° rotator into a thermally-near-unstable symmetrical flat-flat resonator, a continuous-wave power output of 1157W at 1064nm is obtained with a beam quality factor M2of ～39. To the authors' knowledge, this is the highest power output at 1064 nm for the diode-side-pumped two-rod nd:yag laser.

关键词： nd:yag laser diode-pumped solid-state laser

Oscillation conditions of cw simultaneous dual-wavelength nd：yag laser for transitions 4F3／2-4I9／2 and 4F3／2-4I11／2

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Chinese Physics B 2004年第10期13卷 1689-1693页

作者：李平雪李德华李春勇张治国 LaboratoryofOpticalPhysics InstituteofPhysicsChineseAcademyofSciencesBeijing100080China

The operating condition of a cw simultaneous dual-wavelength nd:yag laser for both 4F3/2-4I9/2 (quasi-threelevel system) and 4F3/2-4I11/2 (four-level system) transitions is studied. According to this condition, the cw simultaneous dual-wavelength at 1.06μm and 946 nm in nd:yag crystal has been realized experimentally through an adaptive coating design of the cavity mirrors. A total power output of 2.5W of the dual-wavelength at 946nm and 1.06μm has been achieved with an optical conversion efficiency 14.3%. The experimental results are in good agreement with the theoretical analysis.

关键词： dual-wavelength nd:yag laser diode-pumped laser