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er:yag激光和Nd:yag激光辅助的牙漂白对树脂充填体粘接强度和边缘微渗漏的影响

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上海口腔医学 2023年第4期32卷 351-355页

作者：侯秀秀苑克勇黄正蔚马瑞上海交通大学医学院附属第九人民医院牙体牙髓病科上海交通大学口腔医学院国家口腔医学中心国家口腔疾病临床医学研究中心上海市口腔医学重点实验室上海口腔医学研究所上海200011

目的评价er:yag激光和Nd:yag激光辅助的牙漂白对釉质表面树脂充填体粘接强度和边缘微渗漏的影响。方法将离体牙制备成釉质测试试件(n=64)后随机分为4组(n=16),包括对照组、传统漂白组、er:yag激光辅助的漂白组和Nd:yag激光辅助的漂白组... 详细信息

目的评价er:yag激光和Nd:yag激光辅助的牙漂白对釉质表面树脂充填体粘接强度和边缘微渗漏的影响。方法将离体牙制备成釉质测试试件(n=64)后随机分为4组(n=16),包括对照组、传统漂白组、er:yag激光辅助的漂白组和Nd:yag激光辅助的漂白组。4组试件分别处理后,检测其釉质表面树脂充填体的剪切粘接强度(n=8)和微渗漏深度(n=8),利用体视显微镜观察各组试件的断裂模式。采用SPSS 26.0软件包对数据进行统计学分析。结果与对照组相比,传统漂白后釉质表面树脂充填体的粘接强度显著下降,边缘微渗漏显著增加(Per:yag激光辅助的漂白后釉质表面充填体的剪切粘接强度和微渗漏深度与对照组相比无显著差异(P>0.05),Nd:yag激光辅助的漂白后树脂充填体的剪切粘接强度显著下降(P0.05)。4组试件的粘接断裂模式主要为粘接界面断裂。结论相比传统漂白方法,激光辅助的牙漂白对树脂充填体粘接强度和微渗漏的影响较小,具有一定的临床优势。

关键词：漂白 er:yag Nd:yag 粘接强度微渗漏

Simultaneous tailoring of longitudinal and transverse mode inside an er:yag laser

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Chinese Optics Letters 2021年第11期19卷 60-65页

作者：宋睿刘雪婷付时尧高春清 School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Photoelectronic Imaging Technology and System Ministry of EducationBeijing 100081China Key Laboratory of Information Photonics Technology Ministry of Industry and Information TechnologyBeijing 100081China

In this paper, we demonstrate a scheme to tailor both longitudinal and transverse modes inside a laser cavity and constitute an eye-safe single longitudinal mode er∶Y_(3)Al_(5)O_(12)(er:yag) vector laser. A q-plate is employed as a spin-orbital conversion element to modulate the transverse mode and obtain cylindrical vector beams. An optical isolator is employed as a nonreciprocal element for the ring cavity to enforce unidirectional operation and achieve single longitudinal oscillation. The characteristics of power, transverse intensity, and polarization spectrum of the output beams are observed. The observed typical single longitudinal mode and highly matched special polarizations prove the successful tailoring of both longitudinal and transverse modes.

关键词： er:yag single longitudinal mode cylindrical vector beam

A 3-kHz er:yag single-frequency laser with a‘triple-reflection’configuration on a piezoelectric actuator

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Chinese Physics B 2020年第8期29卷 281-285页

作者：黄帅王庆张濛陈朝勇王凯鑫高明伟高春清 School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Information Technology Ministry of Industry and Information TechnologyBeijing Institute of TechnologyBeijing 100081China

A novel er:yag laser system operating at 1645 nm with high pulse-repetition-frequency(PRF)of kHz level is demonstrated.A ring cavity with double gain medium end-pumped by two fiber lasers is utilized to obtain high pulse energy.A novel‘triple-reflection’configuration on a piezoelectric actuator(PZT)is adopted to achieve high-repetition-rate at 3-kHz operation with the ramp-fire locking method.Single frequency pulses with maximum average power of 18.3 W at 3 kHz are obtained,and the pulse duration time is 318 ns.The full line width at half maximum(FWHM)of the pulses measured by the heterodyne technique is 1.71 MHz at 3 kHz.To the best of our knowledge,this is the highest PRF single-frequency laser pulses achieved based er:yag gain medium.

关键词： er:yag injection-seeded single-frequency high pulse-repetition-frequency

2.94 μm LiNbO声光调Q er:yag激光输出脉冲特性

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物理学报 2023年

作者：王滔宁姜玲玲程庭清王礼江海河中国科学技术大学中国科学院合肥物质科学研究院健康与医学技术研究所中国科学院安徽光学精密机械研究所

2.94 μm纳秒铒激光是宽调谐中红外激光和临床医疗研究中重要的固体激光源。本文研制了新型LiNbO3声光调Q er:yag 激光器，研究了20 Hz重复频率下不同调Q延迟时间和耦合腔镜反射率对激光输出脉冲特性的影响规律，根据测量激光器的热透... 详细信息

2.94 μm纳秒铒激光是宽调谐中红外激光和临床医疗研究中重要的固体激光源。本文研制了新型LiNbO3声光调Q er:yag 激光器，研究了20 Hz重复频率下不同调Q延迟时间和耦合腔镜反射率对激光输出脉冲特性的影响规律，根据测量激光器的热透镜焦距设计了凹凸谐振腔补偿热透镜效应，获得了激光单脉冲能量为34.68 mJ、脉冲宽度为119.9 ns的调Q输出，相应的峰值功率为289.24 kW，与平平腔相比输出能量提高了2.09倍，据我们所知，这是目前声光调Q er:yag激光器中获得的最高能量。本研究为进一步研究宽调谐中红外激光技术提供了新的手段。

关键词：固体激光器 er:yag LiNbO 声光调Q开关

Laser diode pumped high-energy single-frequency er:yag laser with hundreds of nanoseconds pulse duration

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Chinese Optics Letters 2020年第3期18卷 40-44页

作者：李尚桦王庆宋睿侯方方高明伟高春清 School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Information Technology Ministry of Industry and Information TechnologyBeijing Institute of TechnologyBeijing 100081China

We demonstrated a high-energy single-frequency erbium-doped yttrium aluminum garnet(er:yag)laser.With1470 nm laser diodes(LDs)as pumping sources,single-frequency laser pulses with energy of 28.6 m J,21.6 m J,and 15.0 m J are obtained at pulse repetition frequency of 200 Hz,300 Hz,and 500 Hz,respectively.As far as we know,this is the highest single-frequency pulse energy with the er:yag gain medium.With the ring cavity design,pulse duration is maintained at hundreds of nanoseconds.This high-energy single-frequency laser with hundreds of nanoseconds pulse duration is a prospective laser source for light detection and ranging applications.

关键词： er:yag injection-locking single-frequency high energy

1 kHz single-frequency, injection-seeded er:yag laser with an optical feedback

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Chinese Optics Letters 2019年第3期17卷 50-54页

作者：张艺轩高春清王庆纳全鑫张濛高明伟黄帅 School of Optics and Photonics Beijing Institute of Technology

A novel 1 kHz single-frequency, Q-switched er-doped yttrium aluminum garnet(er:yag) laser pumped by a 1470 nm laser diode is demonstrated. The 500 ns, 5.52 mJ single-frequency, diffraction-limited pulses are obtained by using a ‘ramp-fire' injection-seeding technique and an optical feedback architecture. The full width at half-maximum of the pulse spectrum is measured to be 1.47 MHz by using the heterodyne technique. The beam quality M2 factors are measured to be 1.18 and 1.24 in the x and y directions, respectively.

关键词： 1 kHz single-frequency injection-seeded er:yag laser optical feedback

Fe:ZnSe laser pumped by a 2.93-μm Cr, er:yag laser

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Chinese Physics B 2019年第6期28卷 195-198页

作者：李英一戴通宇段小明郭春发徐丽伟鞠有伦 National Key Laboratory of Tunable Laser Technology Harbin Institute of TechnologyHarbin 150001China

We demonstrated an Fe:ZnSe laser pumped by a 2.93-μm Cr, er:yag laser at liquid nitrogen and room temperature in single-shot free-running operation for the first time. The xenon flash lamp pumped Cr, er:yag laser had a maximum single pulse energy of 1.414 J, and the threshold and slope efficiency were 141.70 J and 0.70% which were respectively reduced by 29.3% and increased by 52.2% compared with the er:yag laser. At liquid nitrogen temperature of 77 K, the maximum single pulse energy of the Fe:ZnSe laser was 197.6 m J, corresponding to a slope efficiency of 13.4%. The central wavelength and full width at half maximum(FWHM) linewidth were 4037.4 nm and 122.0 nm, respectively. At room temperature, the laser generated a maximum single pulse energy of 3.5 mJ at the central wavelength of 4509.6 nm with an FWHM linewidth of 171.5 nm.

关键词： Fe:ZnSe Cr er:yag free-running

er:yag激光治疗鼻咽癌放疗后放射性龋齿的临床效果观察

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中国医疗器械信息 2022年第5期28卷 117-119页

作者：李淑婷关则任梁国健阳江市人民医院口腔科广东阳江529500

目的:探究er:yag激光治疗鼻咽癌放疗后放射性龋齿的临床效果。方法:选择2020年5月~2021年4月收治的58例放疗后患有放射性龋齿的鼻咽癌患者进行研究,采用随机数表法将其随机分为2组,观察组(n=29)采用er:yag激光治疗,对照组(n=29)采用传... 详细信息

目的:探究er:yag激光治疗鼻咽癌放疗后放射性龋齿的临床效果。方法:选择2020年5月~2021年4月收治的58例放疗后患有放射性龋齿的鼻咽癌患者进行研究,采用随机数表法将其随机分为2组,观察组(n=29)采用er:yag激光治疗,对照组(n=29)采用传统涡轮快机加金刚砂钻车针治疗,比较两组患者的治疗配合度、治疗后疼痛发生率、填充物脱落率以及治疗前后牙周指标变化情况。结果:观察组患者的治疗配合度显著高于对照组(Per:yag激光治疗鼻咽癌放疗后放射性龋齿能够显著提高患者的治疗舒适度,减少疼痛、充填物脱落等不良事件发生,患者接受度更高,且在减轻牙周炎症方面有显著的优势。

关键词：鼻咽癌放射性龋齿 er:yag 激光

er:yag/Nd:yag激光辅助治疗种植体周围炎的临床疗效研究

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Er:YAG/Nd:YAG激光辅助治疗种植体周围炎的临床疗效研究