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Clinical usefulness of transpapillary removal of common bile duct stones by frequency doubled double pulse Nd:YAG laser 被引量:20
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作者 Tae Hyeon Kim Hyo Jeong Oh +2 位作者 Chang-Soo Choi Dong Han Yeom Suck Chei Choi 《World Journal of Gastroenterology》 SCIE CAS CSCD 2008年第18期2863-2866,共4页
AIM: To study the efficacy and the safety of laser lithotripsy without direct visual control by using a balloon catheter in patients with bile duct stones that could not be extracted by standard technique. METHODS: Th... AIM: To study the efficacy and the safety of laser lithotripsy without direct visual control by using a balloon catheter in patients with bile duct stones that could not be extracted by standard technique. METHODS: The seventeen patients (7 male and 10 female; mean age 67.8 years) with difficult common bile duct (CBD) stones were not amenable for conventional endoscopic maneuvers such as sphincterotomy and mechanical lithotripsy were included in this study. Laser wavelengths of 532 nm and 1064 nm as a double pulse were applied with pulse energy of 120 mJ. The laser fiber was advanced under fluoroscopic control through the ERCP balloon catheter. Laser lithotripsy was continued until the fragment size seemed to be less than 10 mm. Endoscopic extraction of the stones and fragments was performed with the use of the Dormia basket and balloon catheter. RESULTS: Bile duct clearance was achieved in 15 of 17 patients (88%). The mean number of treatment sessions was 1.7 ± 0.6. Endoscopic stone removal could not be achieved in 2 patients (7%). Adverse effects were noted in three patients (hemobilia, pancreatitis, and cholangitis). CONCLUSION: The Frequency Doubled Double Pulse Nd:YAG (FREDDY) laser may be an effective and safe technique in treatment of difficult bile duct stones. 展开更多
关键词 Bile duct stones Frequency doubled double pulse nd:yag laser Transpapillary removal Mechanical lithotripsy Balloon catheter
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Passively Q-Switched Nd,Cr:YAG Laser Simultaneous Dual-Wavelength Operation at 946 nm and 1.3μm 被引量:2
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作者 林斌 张秋琳 +3 位作者 张东香 冯宝华 何京良 张景园 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第7期76-79,共4页
A diode-end-pumped Q-switched high-efficiency Nd, Cr:YAG laser with simultaneous dual-wavelength emission at 946nm and 1.3μm is demonstrated. The maximum output power of 1.93 W with simultaneous dual-wavelength oper... A diode-end-pumped Q-switched high-efficiency Nd, Cr:YAG laser with simultaneous dual-wavelength emission at 946nm and 1.3μm is demonstrated. The maximum output power of 1.93 W with simultaneous dual-wavelength operation is achieved at an absorbed pump power of 13.32 W and an absorbed slope efficiency of 15.15%. The maximum optical-optical efficiency is 14.49% with pulse widths of 16.38ns at 946nm and 26.65ns at 1.3μm. A maximum total repetition rate of 43.25 kHz is obtained. 展开更多
关键词 yag as Passively q-switched nd Cr:yag laser Simultaneous Dual-Wavelength Operation at 946 nm and 1.3 of NM nd Cr
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Diode end-pumped self-Q-switched and mode-locked Nd,Cr:YAG /KTP green laser 被引量:2
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作者 杜仕峰 王素梅 +5 位作者 张东香 冯宝华 张春雨 张玲 张治国 张世文 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第7期1522-1525,共4页
We first experimentally demonstrate a laser-diode end-pumped self-Q-switched and mode-locked Nd,Cr:YAG green laser with a KTP crystal as the intra-cavity frequency doubler. The device produces an average output power... We first experimentally demonstrate a laser-diode end-pumped self-Q-switched and mode-locked Nd,Cr:YAG green laser with a KTP crystal as the intra-cavity frequency doubler. The device produces an average output power of 680 mW at 532 nm. The corresponding pulse width of the Q-switched envelope of the green laser is 170 + 20 ns. The mode-locked pulses have a repetition rate of approximately 183 MHz and the average pulse duration is estimated to be around sub-nanosecond. It is found that the intra-cavity frequency doubling greatly improves the modulation depth and stability of the mode-locked pulses within the Q-switched envelope. 展开更多
关键词 frequency doubling nd Cr:yag crystal self-q-switched and mode-locked pulses green laser
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High-Power Passively Q-Switched Nd:YAG Laser at 1112 nm with a Cr^(4+):YAG Saturable Absorber 被引量:1
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作者 敦洋洋 李平 +1 位作者 陈晓寒 马宝民 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第2期30-33,共4页
A high-power passively Q-switched Nd:YAG laser operating at lll2nm with Cr4+:yAO as a saturable absorber is demonstrated. Under 808 nm diode-direct pumping, the maximum average output power of 2.73 W is achieved at... A high-power passively Q-switched Nd:YAG laser operating at lll2nm with Cr4+:yAO as a saturable absorber is demonstrated. Under 808 nm diode-direct pumping, the maximum average output power of 2.73 W is achieved at the pump power of 16.65 W, corresponding to an optical-to-optical conversion efficiency of 16.4%. At the same time, the pulse width, pulse repetition rate, single pulse energy and peak power are 27.2ns, 9 kHz, 303.3#3 and 11.2kW, respectively. As far as we know, the result gives the highest average output power at 1112nm generated by an 808 nm diode-end-pumped Nd:YAG laser. 展开更多
关键词 yag Saturable Absorber High-Power Passively q-switched nd:yag laser at 1112 nm with a Cr NM of nd with
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Efficient Passively Q-Switched Nd:YAG/Cr4+:YAG/LBO Microchip Laser 被引量:1
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作者 付圣贵 欧阳雪莹 刘晓娟 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第10期48-50,共3页
Performance of an LD-end-pumped passively Q-switched Nd: YA G/Cr4+ : YA G microchip laser operating at 1123 nm is studied. A maximum average output power of 517row with an optical-to-optical conversion efficiency o... Performance of an LD-end-pumped passively Q-switched Nd: YA G/Cr4+ : YA G microchip laser operating at 1123 nm is studied. A maximum average output power of 517row with an optical-to-optical conversion efficiency of 12.6% and a slope efficiency of 25.8% is obtained under a pump power of 4.1 W. A minimum pulse width of 1.1 ns with a pulse repetition rate of 20.2kHz is obtained, and the corresponding pulse energy and peak power are 25.6μJ and 23.3kW, respectively. To our knowledge, the 23.3kW peak power is the highest among 1123nm lasers. Additionally, based on the 1123 nm laser, with LBO as the frequency doubler, a 288-mW green-yellow laser at 561 nm is successfully achieved. 展开更多
关键词 yag/LBO Microchip laser LBO Efficient Passively q-switched nd:yag/Cr nd
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Efficient Diode-Pumped Actively Q-Switched Ceramic Nd:YAG/YVO4 Raman Laser Operating at 1657 nm
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作者 张华年 陈晓寒 +1 位作者 王青圃 李平 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第1期56-58,共3页
A diode-pumped actively Q-switched Raman laser is demonstrated, with YV04 employed as Raman active medium, based on a ceramic Nd:YAG laser operating at 1444nm. The first-stokes Raman generation at 1657nm is achieved.... A diode-pumped actively Q-switched Raman laser is demonstrated, with YV04 employed as Raman active medium, based on a ceramic Nd:YAG laser operating at 1444nm. The first-stokes Raman generation at 1657nm is achieved. A maximum output power of as high as 612mW is obtained under a pump power of 20. 7 W and at a pulse repetition frequency rate of 20kHz, corresponding to an optical-to-optical conversion efficiency of 3%. 展开更多
关键词 yag Ra Efficient Diode-Pumped Actively q-switched Ceramic nd:yag/YVO4 Raman laser Operating at 1657 nm kHz nd
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Diode Pumped High Peak Power Quasi Q-Switched and Passively Q-Switched Nd:YVO<sub>4</sub>Lasers at 1064 nm and 532 nm using Cr:YAG and KTP crystals
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作者 Ashraf F. El-Sherif Mahmoud M. Talat 《Optics and Photonics Journal》 2013年第1期51-62,共12页
Diode end-pumped solid-state lasers have the potential to yield high quality laser beams with high efficiency for laser range finding and warning receiver applications as well as day and night military laser designati... Diode end-pumped solid-state lasers have the potential to yield high quality laser beams with high efficiency for laser range finding and warning receiver applications as well as day and night military laser designation systems. In this paper we presents theoretical calculations using Advanced Dynamics Professional LASCAD software and experimental studies for a high power pigtailed fiber diode laser module of 8 W operating at 808 nm with a specially designed high efficiency cooling system, end pumped high-efficiency Nd:YVO4 laser of 3 × 3 × 10 mm rod and overall cavity length of 44 mm. To the best of our knowledge a self Q-switching effects was generated in Nd:YVO4 laser by changing the cavity dimensions and the position of the intracavity KTP crystal at certain regime of operation for the first time, in which the cavity length is reduced to be 30 mm and the distance between Nd:YVO4 rod and KTP crystal is only 1mm. Self Q-switched laser pulse at 532 nm with high peak power of 96 W, pulse width of 88 ns at FWHM and repetition rate of 400 kHz was achieved. Experimental studies of a passive Q-switched Nd:YVO4 laser using Cr:YAG crystal with three different transmissions of 30%, 40% and 70% were investigated. Passive Q-switched laser pulse at 1064 nm and narrow line width of less than 1.5 nm with highest peak power of nearly 18 kW, short pulse width of less than 4 ns at FWHM and higher repetition rate of 45 kHz using Cr:YAG with transmission of 30% was achieved for the first time. 展开更多
关键词 High POWER Diode laser High POWER nd:YVO4 laser CR:yag Saturable Absorber Mirror Passive q-switchING KTP Crystal Self q-switchING Special Cooling System
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Simulation of Diode-Pumped Q-Switched Nd:YAG Laser Generating Eye-Safe Signal in IOPO Environment
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作者 Mian M. Ashraf Muhammad Siddique 《Optics and Photonics Journal》 2012年第3期167-172,共6页
Numerical simulation of diode-pumped Q-switched Nd:YAG laser leading to the generation of eye-safe signal in singly resonant Intracavity Optical Parametric Oscillator (IOPO) is presented. Starting from rate equations,... Numerical simulation of diode-pumped Q-switched Nd:YAG laser leading to the generation of eye-safe signal in singly resonant Intracavity Optical Parametric Oscillator (IOPO) is presented. Starting from rate equations, the time dependent laser equations have been solved numerically, whereas the space-dependent OPO equations analytically. Our results show that 1.4 J diode laser (810 nm) pulse with 200 msec width, delivers 30 mJ Nd:YAG laser (1064 nm) pulse with 5 n-second width. This Nd:YAG laser further generates 9 mJ eye safe signal (1570 nm) pulse with 2.5 n-second width. 展开更多
关键词 SIMULATION Diode laser q-switched nd:yag laser Eye-Safe laser SIGNAL Idler IOPO Rate Equations Out-Put Power KTP Non-Linear Crystal Pump Beam WAIST
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Q-switched and Mode-locked Characteristics of Cr^(4+)∶YAG Crystal 被引量:1
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作者 TIAN Wen-miao YANG Feng +3 位作者 GAO Li-yan WANG Guang-gang LIU Shi-hua LIU Jie 《Semiconductor Photonics and Technology》 CAS 2006年第3期145-149,共5页
The passively Q-switched and mode-locked(QML) characteristics in a diode-pumped Nd∶GdVO4 laser with Cr4+∶YAG saturable absorbers have been demonstrated. A maximum average output power of 710mW has been obtained in... The passively Q-switched and mode-locked(QML) characteristics in a diode-pumped Nd∶GdVO4 laser with Cr4+∶YAG saturable absorbers have been demonstrated. A maximum average output power of 710mW has been obtained in the QML laser. The maximum energy of a single Q-switched pulse is 52.5μJ, with the corresponding pulse width of 30ns and the peak power of 1.75kW, at the incident pump power of 7.75W. The repetition rates of the Q-switched envelope and the mode-locked laser pulse are 16.7kHz and 680MHz, respectively. 展开更多
关键词 Cr^4+: yag crystal nd: GdVO4 crystal q-switched and mode-locked laser
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Experimental study of electro-optical-switched pulsed Nd:YAG laser 被引量:1
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作者 A Maleki M Kavosh Tehrani +1 位作者 H Saghafifar M H Moghtader Dindarlu 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第3期210-214,共5页
We report the specification of a compact and stable side diode-pumped Q-switched pulsed Nd:YAG laser. We ex- perimentally study and compare the performance of the pulsed Nd:YAG laser in the free-running and Q-switch... We report the specification of a compact and stable side diode-pumped Q-switched pulsed Nd:YAG laser. We ex- perimentally study and compare the performance of the pulsed Nd:YAG laser in the free-running and Q-switched modes at different pulse repetition rates from 1 Hz to 100 Hz. The laser output energy is stabilized by using a special configu- ration of the optical resonator. In this laser, an unsymmetrical concave-concave resonator is used and this structure helps the mode volume to be nearly fixed when the pulse repetition rate is increased. According to the experimental results in the Q-switched operation, the laser output energy is nearly constant around 70 mJ with an FWHM pulse width of 7 ns at 100 Hz. The optical-to-optical conversion efficiency in the Q-switched regime is 17.5%. 展开更多
关键词 side diode-pumped nd:yag laser concave-concave resonator electro-optical q-switched laser
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Induction of oxidative stress in human aqueous and vitreous humors by Nd:YAG laser posterior capsulotomy
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作者 Loredana BergANDi Oleksii A Skorokhod +3 位作者 Federica Franzone Rosalba La Grotta Evelin Schwarzer Raffaele Nuzzi 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2018年第7期1145-1151,共7页
AIM: To evaluate whether the Q-switched Nd:YAG laser treatment applied in routine capsulotomy elicits oxidative stress in aqueous and vitreous humors. METHODS: Thirty-six patients who had to undergo a 25 gauge par... AIM: To evaluate whether the Q-switched Nd:YAG laser treatment applied in routine capsulotomy elicits oxidative stress in aqueous and vitreous humors. METHODS: Thirty-six patients who had to undergo a 25 gauge pars plana vitrectomy due to vitreoretinal disorders were enrolled, 15 of them underwent a Q-switched Nd:YAG laser capsulotomy 7 d before vitrectomy due to posterior capsule opacification(PCO)(Nd:YAG laser group) while the remaining 21 patients were not laser treated before vitrectomy(no Nd:YAG laser group). Samples of the aqueous and vitreous humors were collected during vitrectomy from all patients for the assessment of oxidative parameters which were compared between the Nd:YAG laser group and no Nd:YAG laser group. Thiobarbituric acid reactive substances(TBARS), a product of membrane lipid peroxidation, nitrite levels, the antioxidative activities of SOD and catalase, the 4-HNE-protein conjugate formation, indicating structural modifications in proteins due to lipoperoxidation, were assessed in aqueous and vitreous samples. RESULTS: In the human vitreous humor TBARS levels are significantly higher in the Nd:YAG laser group compared to the no Nd:YAG laser group and importantly, there is a significant correlation between the TBARS levels and the total energy of Nd:YAG laser used during capsulotomy.Moreover the anti-oxidative activities of SOD and catalase were significantly decreased by Nd:YAG laser treatment, both in aqueous and vitreous humors. In accordance with the TBARS data and anti-oxidative enzyme activities, significantly higher levels of proteins were conjugated with the lipoperoxidation product 4-HNE in the aqueous and vitreous humors in the Nd:YAG laser-treated group in comparison to no Nd:YAG laser group. CONCLUSION: These data, clearly suggest that any change that Q-switched Nd:YAG photo disruption may cause in the aqueous and vitreous compartments, resulting in a higher level of oxidative damage might be of considerable clinical significance particularly by accelerating the aging of the anterior and posterior segments of the eye and by worsening the intraocular pressure, the uveal, the retinal(especially macular) pathologies. 展开更多
关键词 posterior capsule opacification q-switched nd:yag laser oxidative stress VITRECTOMY
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倍频Nd:YAG激光对兔眼视网膜损伤作用的观察 被引量:9
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作者 陈虹霞 顾瑛 +2 位作者 刘凡光 曾晶 韩丽娜 《中国激光医学杂志》 CAS CSCD 2005年第2期69-73,共5页
目的探讨不同剂量倍频Nd:YAG激光对兔眼视网膜损伤作用的特点和规律,及其在临床上作为PDT治疗脉络膜新生血管光源的安全性。方法以新西兰兔10只20眼为实验对象,倍频Nd:YAG激光(532nm)通过裂隙灯照射兔眼底视乳头下方的后极部,照光功率... 目的探讨不同剂量倍频Nd:YAG激光对兔眼视网膜损伤作用的特点和规律,及其在临床上作为PDT治疗脉络膜新生血管光源的安全性。方法以新西兰兔10只20眼为实验对象,倍频Nd:YAG激光(532nm)通过裂隙灯照射兔眼底视乳头下方的后极部,照光功率密度为600、800、1000、1600和2000mW/cm2,照光时间为100s和200s,光斑直径为2mm。在照后第1h和24h进行眼底照相与组织病理学观察,初步确定在该照射条件下,倍频Nd:YAG激光的兔视网膜损伤阂值范围。结果在本实验条件下,眼底镜与眼底荧光造影显示视网膜最小损伤剂晕为100J/cm2,光镜下出现损伤剂量为80J/cm2;视网膜激光损伤在24h内逐渐加重;能量密度相同的情况下,激光视网膜损伤程度与功率密度关系更为密切。结论532nm激光作为临床上PDT治疗脉络膜新生血管的光源是安全可行的。 展开更多
关键词 倍频nd:yag激光 损伤作用 眼视网膜 脉络膜新生血管 视网膜激光损伤 532NM激光 病理学观察 不同剂量 实验对象 新西兰兔 功率密度 眼底照相 照射条件 损伤阈值 实验条件 造影显示 眼底荧光 能量密度 密度关系 损伤程度
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激光二极管泵浦Nd∶YAG 946nm激光器及倍频研究(英文) 被引量:5
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作者 杜戈果 阮双琛 +2 位作者 朱勤 朱鹤元 李富铭 《光子学报》 EI CAS CSCD 北大核心 2001年第11期1392-1395,共4页
提出如何克服准三能级再吸收损耗和抑制寄生振荡实现 LD泵浦的 Nd∶YAG946nm激光器 .在室温下 946nm连续输出大于 1 2 0 m W,斜率效率接近 1 0 %,同时采用 KNb O3 晶体实现了腔内倍频的蓝色激光输出 .
关键词 激光二极管泵浦 946nm 激光器 腔内倍频 nd:yag KNBO3 晶体 改进措施
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倍频Nd:YAG激光两种波长治疗血管瘤效果比较 被引量:5
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作者 易阳艳 王朝慧 +2 位作者 戴江华 林涛 袁敬东 《中国现代医学杂志》 CAS CSCD 北大核心 2013年第14期67-70,共4页
目的观察比较倍频Nd:YAG 532 nm和1 064 nm激光治疗皮肤血管瘤的疗效。方法分别使用532 nm和1 064 nm两种波长治疗皮肤血管瘤108例,观察病变范围的大小和色泽变化,并结合病理切片比较两者疗效。结果倍频Nd:YAG 532 nm和1 064 nm两种波... 目的观察比较倍频Nd:YAG 532 nm和1 064 nm激光治疗皮肤血管瘤的疗效。方法分别使用532 nm和1 064 nm两种波长治疗皮肤血管瘤108例,观察病变范围的大小和色泽变化,并结合病理切片比较两者疗效。结果倍频Nd:YAG 532 nm和1 064 nm两种波长治疗血管瘤4次后有效率分别为75.9%和94.4%,总有效率为85.2%,不良反应发生率低。病理切片结果显示,两种治疗波长照射后瘤体内血管数量减少,血管腔变细,且1 064 nm较532 nm治疗后的改变更明显。结论倍频Nd:YAG 1 064 nm激光治疗皮肤血管瘤是一种安全、有效的方法。 展开更多
关键词 倍频nd yag激光 血管瘤 病理切片 疗效
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可调脉宽倍频Nd:YAG激光和积雪草苷对增生性瘢痕的疗效比较 被引量:14
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作者 吴东辉 谭军 +2 位作者 钟茜 罗明灿 李波 《中国美容整形外科杂志》 CAS 2008年第2期103-105,共3页
目的通过比较可调脉宽倍频Nd:YAG激光和积雪草苷对增生性瘢痕的疗效,探讨可调脉宽倍频Nd:YAG激光治疗增生性瘢痕的优越性。方法将164例增生性瘢痕患者随机分成A、B两组。A组患者为118例,采用可调脉宽倍频Nd:YAG激光进行治疗,并根据瘢痕... 目的通过比较可调脉宽倍频Nd:YAG激光和积雪草苷对增生性瘢痕的疗效,探讨可调脉宽倍频Nd:YAG激光治疗增生性瘢痕的优越性。方法将164例增生性瘢痕患者随机分成A、B两组。A组患者为118例,采用可调脉宽倍频Nd:YAG激光进行治疗,并根据瘢痕的厚度和颜色及患者正常皮肤颜色和个体差异,选择脉宽10~40ms和能量密度12~32J/cm2进行治疗,治疗1~3次,每次间隔1~3个月;B组患者为46例,采用积雪草苷霜进行治疗,将积雪草苷霜外涂于瘢痕处,每日2次,并局部按摩,一个疗程为3个月,共2~3个疗程。结果治疗后随访患者3~8个月。A组:显效者75例,有效者35例,无效者8例;B组:显效者5例,有效者28例,无效者13例。结论可调脉宽倍频Nd:YAG激光对增生性瘢痕具有较好的疗效,与积雪草苷比较有起效快、疗效好、效果稳定等优越性。 展开更多
关键词 增生性瘢痕 可调脉宽倍频nd:yag激光 积雪草苷 疗效比较
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二极管泵浦Nd:YAG棒双通放大器技术 被引量:4
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作者 高清松 童立新 +5 位作者 李德明 陈晓琳 蔡震 姚震宇 唐淳 冯国英 《强激光与粒子束》 EI CAS CSCD 北大核心 2005年第B04期26-28,共3页
二极管泵浦Nd:YAG棒双通放大器采用两个峰值功率6.5 kW激光泵浦模块作为泵浦源。每个激光泵浦模块由81个二极管激光器组成,Nd:YAG棒直径为6 mm,Nd掺杂质量分数1%。在两个封装方式和结构一致的激光泵浦模块之间采用光学像传递和插入90... 二极管泵浦Nd:YAG棒双通放大器采用两个峰值功率6.5 kW激光泵浦模块作为泵浦源。每个激光泵浦模块由81个二极管激光器组成,Nd:YAG棒直径为6 mm,Nd掺杂质量分数1%。在两个封装方式和结构一致的激光泵浦模块之间采用光学像传递和插入90°石英旋转片进行退偏补偿。在重复频率400Hz,谐振腔输出单脉冲能量6 mJ时,双通输出400 mJ,激光器光光转换效率为12.3%,光束质量4.6,脉宽15ns。 展开更多
关键词 二极管激光器 双通放大器 nd:yag
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倍频Nd∶YAG激光周边虹膜成形术后虹膜组织病理学研究 被引量:12
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作者 邹俊 廉井财 王康孙 《中国激光医学杂志》 CAS CSCD 2001年第4期247-251,共5页
目的 探讨倍频Nd∶YAG激光周边虹膜成形术后的虹膜组织病理学改变及作用机制。方法 采用倍频Nd∶YAG激光对猴眼的周边部虹膜行激光周边虹膜成形术 ,通过裂隙灯显微镜 ,光镜及扫描电镜观察术后1、3个月的虹膜组织病理学改变。结果 术... 目的 探讨倍频Nd∶YAG激光周边虹膜成形术后的虹膜组织病理学改变及作用机制。方法 采用倍频Nd∶YAG激光对猴眼的周边部虹膜行激光周边虹膜成形术 ,通过裂隙灯显微镜 ,光镜及扫描电镜观察术后1、3个月的虹膜组织病理学改变。结果 术后 1、3个月的光镜和扫描电镜显示光凝处的虹膜收缩纹和不同程度的纤维细胞及胶原纤维增生。结论 证实了激光周边虹膜成形术的作用机制 :(1)虹膜组织内黑色素细胞及胶原蛋白吸收光能并转变为热能引起光凝固反应 ;光凝部位虹膜表面的成纤维细胞增生及胶原蛋白形成 ,导致产生瘢痕。 (2 )该术式可减轻虹膜根部膨隆 ,增宽前房角 ,增加房水引流。 展开更多
关键词 激光 周边虹膜成形术 组织病理学 原发性闭角型青光眼 倍频nd:yag激光
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Nd∶YAG脉冲激光器双光路输出分时控制系统的设计 被引量:3
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作者 张健 张庆茂 +3 位作者 吴锐欢 陈国 李泽曦 刘颂豪 《中国光学》 EI CAS 2013年第4期529-535,共7页
针对现有激光器多光路加工特点,采用Nd∶YAG脉冲激光器为光源,研制出激光器双光路输出分时控制系统。提出了具体的分时分光技术方案,设计出能够实现分时分光的分光装置,以及对装置的工作状态进行实时控制的分时控制电路,并确定了系统的... 针对现有激光器多光路加工特点,采用Nd∶YAG脉冲激光器为光源,研制出激光器双光路输出分时控制系统。提出了具体的分时分光技术方案,设计出能够实现分时分光的分光装置,以及对装置的工作状态进行实时控制的分时控制电路,并确定了系统的程序流程。在不降低输出功率的前提下,实现了激光在不同时间、不同输出端口的输出,完成了分时分光。为避免因分光装置抖动而造成的光纤损坏,利用黑色相纸对光斑进行采样。结果表明:在全反镜改变位置后至激光输出,延时300 ms为最佳时间。该系统能实现激光的时分复用、动态分光,满足了多光路输出需求;而且系统的扩展能力强,能够根据实际激光加工状况,为激光加工设备的改进和升级提供思路。 展开更多
关键词 ndyag激光器 双光路 分时控制 分光装置
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LD抽运Nd:YAG/KTP腔内倍频16W连续波绿光激光器 被引量:6
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作者 戴厚梅 白晋涛 《激光技术》 CAS CSCD 北大核心 2008年第3期312-313,共2页
为了得到一台大功率连续波绿光激光器,采用9个20W的高功率半导体激光器侧面抽运Nd∶YAG棒,倍频晶体选用Ⅱ类相位匹配的KTP晶体,设计了三镜折叠腔结构,使得放置倍频晶体位置处基频光的光腰稍大,从而尽量避免KTP晶体的"灰线效应&quo... 为了得到一台大功率连续波绿光激光器,采用9个20W的高功率半导体激光器侧面抽运Nd∶YAG棒,倍频晶体选用Ⅱ类相位匹配的KTP晶体,设计了三镜折叠腔结构,使得放置倍频晶体位置处基频光的光腰稍大,从而尽量避免KTP晶体的"灰线效应",通过调节角度的办法来补偿倍频晶体热效应导致的相位失配,得到在抽运电流为19.5A时,连续波绿光输出可达16W,倍频转换效率为40%的结果。实验结果表明,Nd∶YAG/KTP是产生大功率连续绿光的较佳组合。 展开更多
关键词 激光器 输出功率 倍频 nd:yag KTP
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用于准相位匹配的LD泵浦Nd∶YAG 946nm连续激光光源 被引量:1
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作者 杜戈果 朱鹤元 +1 位作者 朱九皋 李富铭 《光子学报》 EI CAS CSCD 北大核心 2001年第8期973-976,共4页
本文为泵浦质子交换准相位匹配波导器 Li Nb O3 提供了激光光源 ,用 80 8nm半导体激光器泵浦 Nd∶ YAG晶体 ,在室温下获得 946 nm激光连续输出大于 1 2 0 m W,斜率效率9.8% ,并且在国内首次实现了 LD泵浦 Nd∶YAG/ KNb O3 4 73 nm蓝色... 本文为泵浦质子交换准相位匹配波导器 Li Nb O3 提供了激光光源 ,用 80 8nm半导体激光器泵浦 Nd∶ YAG晶体 ,在室温下获得 946 nm激光连续输出大于 1 2 0 m W,斜率效率9.8% ,并且在国内首次实现了 LD泵浦 Nd∶YAG/ KNb O3 4 73 nm蓝色激光器的连续运转 ,报道了初步的实验结果并对此进行了详细的分析 ,提出了改进方案 . 展开更多
关键词 LD泵浦 固体激光器 nd:yag 946nm激光器 倍频 泵浦质子交换准相位匹配波导器 LINBO3
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