共查询到20条相似文献,搜索用时 93 毫秒
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设计了一种高倍率的固体皮秒脉冲激光放大器,采用Nd:YAG板条作为激光增益介质。借助板条结构的角度选通结构,搭建了板条五通放大系统,实现了对注入皮秒脉冲激光的高倍率放大。种子源工作在脉冲模式,放大器泵浦源在连续模式工作。皮秒光纤激光器可以在不同的重复频率下工作,脉冲宽度为13.4 ps。种子光经过隔离和耦合系统之后,注入板条的单脉冲能量为25 nJ。当种子源工作重复频率为24.46 MHz时,板条放大器输出平均功率377 W,单脉冲能量15.5 μJ;当种子源工作重复频率为49.8 kHz时,板条放大器输出平均功率89 W,单脉冲能量1.8 mJ,峰值功率为134 MW,放大倍率达到7.2×104。 相似文献
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针对高平均功率固体激光器对Nd:YAG晶体板条的技术需求,进行了Nd:YAG晶体板条低透射波前误差加工技术研究。详细分析了光学加工过程中引起板条端面透射波前畸变的误差来源,并提出工艺技术解决方案。实验结果表明,在板条抛光阶段通过采用合成盘硬抛光工艺以及新的工件装夹技术,能够解决传统板条加工工艺在面形及楔角精度方面可控性差的问题,更容易实现Nd:YAG晶体板条的低透射波前误差加工。对于150mm×30mm×2.5mm规格的Nd:YAG晶体板条元件,端面透射波前畸变PV值达到0.74λ。 相似文献
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赵世杰谢瑞清廖德锋陈贤华王健 《强激光与粒子束》2015,(6):171-176
针对高平均功率固体激光器对Nd:YAG晶体板条的技术需求,进行了Nd:YAG晶体板条低透射波前误差加工技术研究。详细分析了光学加工过程中引起板条端面透射波前畸变的误差来源,并提出工艺技术解决方案。实验结果表明,在板条抛光阶段通过采用合成盘硬抛光工艺以及新的工件装夹技术,能够解决传统板条加工工艺在面形及楔角精度方面可控性差的问题,更容易实现Nd:YAG晶体板条的低透射波前误差加工。对于150mm×30mm×2.5mm规格的Nd:YAG晶体板条元件,端面透射波前畸变PV值达到0.74λ。 相似文献
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针对高功率板条激光器核心工作器件——板条Nd:YAG晶体的超精密加工开展研究,分析了具有特殊构型的板条Nd:YAG晶体元件的加工性能及工艺难点,提出了一种新的基于合成盘抛光的板条Nd:YAG晶体加工工艺,并对规格为100mm×30mm×3mm的板条Nd:YAG晶体进行了加工实验。实验结果表明,合成盘抛光可以很好地控制元件的塌边现象;通过磨料的优化选择,在合成盘抛光工艺中匹配合适粒度的Al2O3磨料能够实现元件的低缺陷加工,元件下盘后的全反射面平面度达0.217λ(1λ=632.8nm),端面平面度达到0.06λ,表面粗糙度达0.55nm(RMS),端面楔角精度可达2″。 相似文献
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S. K. Sudheer V. P. Mahadevan Pillai V. U. Nayar 《Journal of Raman spectroscopy : JRS》2007,38(4):427-435
The application of lasers for processing diamond has revolutionized the diamond industry and its applications in microelectronics, microelectromechanical system (MEMS) and microoptoelectromechanical system (MOEMS) technologies. The process quality can be evaluated using spectroscopic techniques. In the present investigation, four different types of Q‐switched solid‐state lasers (with different beam parameters), namely, a lamp‐pumped Nd:YAG laser operating at 1064 nm, a lamp‐pumped Nd:YAG laser operating at second harmonically generated 532 nm, a diode‐pumped Nd:YVO4 laser operating at 1064 nm and a diode‐pumped Nd:YAG laser operating at 1064 nm, have been employed for the processing of a single‐crystal, gem‐quality, natural diamond. The main objective behind the selection of these lasers with different beam parameters was to study the effect of wavelength, pulse width, pulse energy, peak power and beam quality factor (M2 factor) on various aspects of processing (such as microcracking, material loss and cut surface quality) and their relative merits and demerits. The overall weight loss of the diamond and formation of microcracks during processing have been studied for the above four cases. The characteristics of the graphite formed during processing, elemental analysis, surface morphology of the cut surface and process dynamics have been studied using micro‐Raman spectroscopy and scanning electron microscopy (SEM). We observed that laser cutting of single‐crystal diamonds used for industrial applications can be accomplished without microcracking or surface distortion using Q‐switched Nd:YAG lasers. This allows direct processing without extensive postgrinding and polishing stages. Very efficient diamond processing is possible using diode‐pumped lasers, which results in the lowest possible breakage rate, good accuracy, good surface finish and low weight loss. From the micro‐Raman and SEM studies, it is concluded that the surface quality obtained is superior when diode‐pumped Nd:YVO4 laser is used, owing to its extremely high peak power. The maximum graphite content is observed while processing with lamp‐pumped Nd:YAG laser at 532 nm. An overall comparison of all the laser sources leads to the conclusion that diode‐pumped Nd:YAG laser is a superior option for the efficient processing of natural diamond crystals. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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A diode pumped, Q-switched Nd:YAG zigzag slab laser is developed using passive conduction cooling. Flat-flat and unstable resonators are adopted in this experiment. The 150-mJ multi-mode and 100-mJ single-mode laser outputs with pulse width of 10 ns are achieved, corresponding to optical efficiencies of 19% and 13%, respectively. The experimental result demonstrates that the laser has the property of compact structure, high efficiency, reliability, and high beam quality. The design of laser has a potential application in space environment. 相似文献
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High peak power Nd:YAG laser pumped by 600-W diode laser stack 总被引:1,自引:0,他引:1
The Q-switched laser with triangle slab made of Nd:YAG crystal side pumped by 600-W quasi-cw diode laser stack has been designed. The multimode (M2≈2.6) output energy of about 42 mJ was demonstrated in free running mode for110-mJ pump energy. In Q-switch experiments, the KDDP Pockels cell was placed between the slab and rear mirror in plane-plane cavity with output coupler of 84% transmission. The energy of 8 mJ in 2.1-ns pulse duration was obtained for near TEM00 output beam. For passive Q-switching by means of Cr:YAG crystal of 12.6% unsaturated transmission, the energy of 5.1 mJ in 2.5-ns pulse duration was obtained for output beam close to TEM00 mode. 相似文献
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千瓦级半导体抽运的固体热容板条激光器 总被引:12,自引:0,他引:12
报道了千瓦级激光二极管面阵抽运固体热容激光器的理论与实验研究,分别采用Nd∶YAG单板条和双板条串接的热容激光器,利用热容激光器的理论计算模型计算了在一定的工作时间内激光输出特性,并进行了实验验证。实验中采用的晶体尺寸均为59mm×40mm×4.5mm,对单板条进行抽运时平均功率大约为5.6kW,双板条串接时为11.2kW,重复频率为1kHz,占空比为20%。实验中观察了1s的工作时间内脉冲能量输出的波动情况,单板条时单脉冲能量输出最大为1.3J,在1 s后单脉冲能量输出下降到开始的70%左右,而双板条串接时单脉冲能量输出最大为2.06J,在1s后单脉冲能量输出下降到开始的50%左右,对单块晶体采用通水冷却的准热容热管理模式能有效地降低其热效应。 相似文献
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二极管激光侧泵浦单横模100Hz电光调Q激光器 总被引:3,自引:0,他引:3
介绍了二极管激光侧泵浦单横模100Hz电光调Q激光器的实验结果。泵浦源为一个线阵准连续100W二极管激光器,激光工作介质为NdYAG薄梯形板条,板条与泵浦源间用柱透镜耦合,KD*P电光晶体调Q。在100Hz重复频率下,获得单脉冲能量2.37mJ,脉宽小于7ns,光束质量因子M2=1.1的1.06μm激光,光-光效率为8.5%,斜效率为18.7%。 相似文献