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激光二极管抽运Nd:YAG双薄片激光器 总被引:10,自引:6,他引:4
激光介质的热效应是高平均功率固体激光器面临的最大挑战,采用薄片激光介质是解决热效应的有效手段之一。当在抽运区尺寸远大于薄片厚度并且抽运光均匀分布的条件下,热流近似为沿厚度方向的一维分布,从而大大降低介质的热透镜效应和热致应力双折射。设计了四通光学耦合系统,通过提高二极管激光器阵列输出激光强度分布的均匀性,并优化经微柱透镜准直后光束的发散角,实现了抽运光的近平顶分布。采用两片1 mm厚的Nd∶YAG薄片激光介质,在两个峰值功率2000 W,占空比为15%的二极管激光器阵列抽运下,获得了峰值功率1440 W,平均功率216 W的准连续激光输出,光光转换效率达到36%,电光转换效率超过16%,在稳腔下测得的光束质量M2 因子约为12×13。 相似文献
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二极管抽运高功率Nd:YAG棒状激光器 总被引:1,自引:0,他引:1
傅恩生 《激光与光电子学进展》2002,39(12):35-40
介绍Atsushi Takada等人研制的全固态棒状激光器,平均功率大于10kW,用于高速和高精度材料加工,如切割和焊接。2000年他们开发了全固态棒状激光器系统,平均功率在3kW量级,以连接波运转平均功率5.1kW,用连续波和准连续波组合运转得到3.3kW。连续波运转时,电光效率22%,准连续波操作时,平均功率2kW,电光效率26%。 相似文献
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二极管角部抽运Nd:YAG基模激光器 总被引:1,自引:1,他引:1
为了分析角部抽运方式在中小功率激光器设计中的可行性,基于光线追迹法,计算了不同的激光介质几何结构参量和不同的二极管温度条件下角部抽运复合板条激光器的抽运效率和抽运均匀性.从模拟计算结果可知,只要选择合理的激光介质结构参量,角抽运方式能得到高的抽运效率和较好的抽运均匀性.设计了一种角部抽运Nd:YAG复合板条激光器,在45W的抽运功率下获得了12W的激光输出,光光转换效率约为26.7%,在40W抽运时光束质量Mx2=1.47,My2=1.36.理论分析和实验设计表明,角抽运方式在小功率激光器设计中是可行的. 相似文献
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为了研究抽运光源光谱与增益介质吸收光谱对发光二极管(LED)带抽运激光器输出效率的影响,进一步提高输出效率,将光谱信息引入激光速率方程中,建立了LED带抽运速率方程, 采用该方法对LED带抽运Nd∶YAG激光器进行了理论分析和实验验证。结果表明,利用红外LED对Nd∶YAG激光器进行侧面抽运,当抽运能量为9.1mJ时,取得了能量为607μJ的1064nm激光输出,达到实验中最高的倾斜效率15.5%,此时光转换效率为6.67%;速率方程的计算求解和实验的输出能量二者基本吻合。这一结果对研究提高LED带抽运激光器的输出效率是有帮助的。 相似文献
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为了分析角部抽运方式在中小功率激光器设计中的可行性,基于光线追迹法,计算了不同的激光介质几何结构参量和不同的二极管温度条件下角部抽运复合板条激光器的抽运效率和抽运均匀性。从模拟计算结果可知,只要选择合理的激光介质结构参量,角抽运方式能得到高的抽运效率和较好的抽运均匀性。设计了一种角部抽运Nd:YAG复合板条激光器,在45W的抽运功率下获得了12W的激光输出,光光转换效率约为26.7%,在40W抽运时光束质量Mx2=1.47,My2=1.36。理论分析和实验设计表明,角抽运方式在小功率激光器设计中是可行的。 相似文献
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阳光泵浦Nd:YAG激光器 总被引:2,自引:0,他引:2
第一台激光器问世不久,便有人致力于太阳能激光器的研究工作,鉴于Nd;YAG晶体的特点,所以阳光泵浦Nd;YAG激光器获得了长足发展,其研究和应用均取得了可喜的成绩,太阳能转化为激光的效率不断提高,输出功率逐渐增加,性能不断完善,各种应用构上继出台。 相似文献
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Experimental results are reported on the room-temperature operation of Nd:YAG lasers end pumped with an LED. The radiation from a 10-percent-efficient 0.46-mm-diam domed LED was coupled to the end of a 0.46-mm-diam × 5.0-mm-long laser rod with a large hemispherical reflector. At 20°C, a multimode laser power of 0.25 mW was obtained at an LED current of 250 mA. By measuring the variation of threshold pump power with rod temperature and the laser power versus pump power just above threshold, both the laser cavity loss and the output mirror transmission were determined. A round-trip cavity loss as low as 0.022 percent was measured. A calculation of the fractional pump power absorbed in the rod for the LED spectrum gave 56 percent for a 5-mm-long rod while measurements showed that 30 to 35 percent of the LED power was being absorbed indicating an LED-to-laser rod coupling efficiency of 54 to 63 percent for this arrangement. With such efficient absorption of pump power and low cavity loss, end-pumped Nd:YAG lasers with high slope efficiencies above threshold are possible. 相似文献
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Goldring S. Lavi R. Tal A. Lebiush E. Tzuk Y. Jackel S. 《Quantum Electronics, IEEE Journal of》2004,40(4):384-389
Heat generation and laser performance of Nd:YAG oscillators pumped in two regimes, band pumping at /spl sim/808 nm and "thermally boosted" (TB) pumping at 884.5 nm, are compared. The crystal, pumped with a Ti:sapphire laser, lased with slope efficiencies of 52% and 57% when pumped at 802 and 884.5 nm, respectively. The heat generated during lasing was found to be 27% lower with TB pumping as compared to traditional band pumping. Moreover, the experimental results suggest that the coupling efficiency between the pump band and the upper lasing level (the quantum efficiency) is unity, and about 8% of the upper lasing level population decays via nonradiative channels. 相似文献
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《Electronics letters》2003,39(20):1446-1448
A continuation of the previously introduced microstructured silicon carrier concept for diode-pumped solid-state lasers is presented, using novel heat-conducting polymers as a carrier. The most prominent features of the silicon carrier concept are maintained, adding to the mass production possibilities of the inexpensive polymers. The first experiments, using a continuous wave Nd:YAG microchip laser, have given an output power of 2 W at 1064 nm, showing the potential of this new approach. 相似文献
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The mechanisms that cause amplitude modulation in CW-pumped YAG lasers were investigated experimentally. The depth of modulation and frequency spectrum of the output fluctuations of a commercially available Nd:YAG laser were measured. It was found that after performing several modifications on the laser system, the output fluctuations were reduced by two orders of magnitude. At the conclusion of the program, the depth of modulation for frequencies below 10 Hz was 10-2, and for frequencies between 10 Hz and 100 kHz, it was 10-3. Above 100 kHz, the modulation decreased rapidly to 10-5reaching shot noise level above 500 kHz. 相似文献
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Nd:YAG激光器在焊接中的应用 总被引:1,自引:0,他引:1
激光焊接在限制热影响区的尺寸、降低焊接表面的粗糙度、消除其机械影响等方面具有重要意义。以连续或脉冲模式工作的固体激光器都可以作为焊接源。目前使用的激光器具有很高的功率密度。固体掺钕激光器,如掺钕钇铝石榴石激光器(Nd:YAG)在工业上的应用已得到证明,这种激光器具有性能可靠、加工安全、控制简单的特点。发射的单脉冲功率可达10^7W或更高,可以极高的速度加工材料。具有高峰值功率的脉冲激光器的加工质量高于具有相同功率等级的平均功率激光器。高峰值功率可以克服贵金属材料如铜或铝的热扩散和反射,还可以利用单脉冲进行大体积焊接。通常,提高激光器的效率和能量是提高激光焊接质量和数量的先决条件。综合大量相关技术的Nd:YAG激光器可以对多种材料进行焊接,材料的厚度可以从几微米到几十毫米。本文对激光焊接近几年的发展历程及发展方向进行概述。 相似文献