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Coherent combining of fiber lasers 光纤激光器的相干组合
Pub Date : 2017-01-13 DOI: 10.1117/12.2257483
P. Bourdon, L. Lombard, A. Durécu, J. Le Gouët, D. Goular, C. Planchat
We describe the coherent combining techniques that can be used to scale up fiber laser power far above single fiber laser limitations, and manipulate their wavefronts. The major configurations and realizations of coherent combining are then presented and compared in terms of maximum achievable number of combined lasers.
我们描述了相干组合技术,可以用来扩大光纤激光功率远远超过单光纤激光的限制,并操纵他们的波前。然后介绍了相干组合的主要结构和实现,并根据最大可实现的组合激光器数量进行了比较。
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引用次数: 4
Stimulated Raman scattering of high pressure gas in multiple-pass configuration 高压气体在多通道结构下的受激拉曼散射
Pub Date : 2017-01-13 DOI: 10.1117/12.2257626
Zhonghui Li, X. Cai, Jingwei Guo, H. Cai, Gao Chen
SRS (Stimulated Raman Scattering) is a very effective method to expand the spectrum range of high power laser, especially in the regime of near IR and middle IR. In this paper SRS of high pressure H2 and D2 with MPC (multiple-pass cell) configuration were reported. Relation of (FS1) first forward Stokes and (BS1) first backward Stokes has been analysis. The process of gain of FS1 was explained. Experimental results also indicated the second Stokes was also generated. D2 SRS of the fundamental output of Nd:YAG laser generates the second Stokes light of 2.92 m. The lasers with wavelength of 2.9 μm have broad applications. Finally, multiple-pass SRS was better for complete conversion of pump laser.
受激拉曼散射(SRS)是扩大高功率激光光谱范围的一种非常有效的方法,特别是在近红外和中红外波段。本文报道了采用MPC (multiple-pass cell)结构的高压H2和D2的SRS。分析了(FS1)第一前向Stokes与(BS1)第一后向Stokes的关系。阐述了FS1的增益过程。实验结果还表明,还产生了第二个斯托克斯。Nd:YAG激光器基频输出的D2 SRS产生2.92 m的第二斯托克斯光。波长为2.9 μm的激光器具有广泛的应用前景。最后,多路SRS更适合于泵浦激光的完全转换。
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引用次数: 0
Amplification of sub-nanosecond pulse in THL-100 laser system THL-100激光系统中亚纳秒脉冲的放大
Pub Date : 2017-01-13 DOI: 10.1117/12.2256352
V. Losev, S. Alekseev, M. Ivanov, N. Ivanov, G. Mesyats, L. Mikheev, Y. Panchenko, N. Ratakhin, A. Yastremsky
The results of the formation and amplification of positive chirped 0.1 ns laser pulse at a central wavelength of 470 nm in the laser system THL-100 are presented. It is shown that a front-end allows forming a radiation pulse with a Gaussian intensity profile and the energy up to 7 mJ. At amplification in XeF(C-A) amplifier of the pulse with 2-5 mJ energy a saturated mode is realized and 3.2 J output laser beam energy is reached.
介绍了在THL-100激光系统中,中心波长为470nm的正啁啾0.1 ns激光脉冲的形成和放大结果。结果表明,前端可以形成高斯强度分布的辐射脉冲,能量可达7 mJ。在XeF(C-A)放大器中,对能量为2-5 mJ的脉冲进行放大,实现了饱和模式,输出激光束能量达到3.2 J。
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引用次数: 3
Studies of cavity enhanced absorption spectroscopy for weak absorption gas measurements 弱吸收气体测量用腔增强吸收光谱的研究
Pub Date : 2017-01-13 DOI: 10.1117/12.2256664
Liucheng Li, L. Duo, D. Gong, Yan-hua Ma, Zhiguo Zhang, Yuanhu Wang, Dongjian Zhou, Yuqi Jin
In order to determine the concentrations of trace amount metastable species in chemical lasers, an off-axis cavity enhanced absorption spectrometer for the detection of weak absorption gases has been built with a noise equivalent absorption sensitivity of 1.6x10-8 cm-1. The absorption spectrum of trace amount gaseous ammonia and water vapor was obtained with a spectral resolution of about 78 MHz. A multiple-line absorption spectroscopic method to determine the temperature of gaseous ammonia has been developed by use of multiple lines of ammonia molecule absorption spectrum.
为了测定化学激光器中微量亚稳物质的浓度,建立了一种检测弱吸收气体的离轴腔增强吸收光谱仪,其噪声等效吸收灵敏度为1.6x10-8 cm-1。得到了微量气态氨和水蒸气的吸收光谱,光谱分辨率约为78 MHz。利用氨分子的多谱线吸收光谱,建立了测定气态氨温度的多谱线吸收光谱方法。
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引用次数: 0
Properties of welded joints in laser welding of aeronautic aluminum-lithium alloys 航空铝锂合金激光焊接接头性能研究
Pub Date : 2017-01-13 DOI: 10.1117/12.2256016
A. Malikov, A. Orishich
The work presents the experimental investigation of the laser welding of the aluminum-lithium alloys (system Al-Mg-Li) and aluminum alloy (system Al-Cu-Li) doped with Sc. The influence of the nano-structuring of the surface layer welded joint by the cold plastic deformation method on the strength properties of the welded joint is determined. It is founded that, regarding the deformation degree over the thickness, the varying value of the welded joint strength is different for these aluminum alloys.
本文对铝锂合金(Al-Mg-Li体系)和Sc掺杂铝合金(Al-Cu-Li体系)的激光焊接进行了实验研究,确定了冷塑性变形法焊接接头表面纳米结构对焊接接头强度性能的影响。研究发现,对于厚度上的变形程度,这些铝合金的焊接接头强度变化值是不同的。
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引用次数: 0
High energy laser demonstrators for defense applications 用于国防的高能激光演示器
Pub Date : 2017-01-13 DOI: 10.1117/12.2254021
M. Jung, T. Riesbeck, J. Schmitz, T. Baumgärtel, K. Ludewigt, A. Graf
Rheinmetall Waffe Munition has worked since 30 years in the area of High Energy Laser (HEL) for defence applications, starting from pulsed CO2 to pulsed glass rods lasers. In the last decade Rheinmetall Waffe Munition changed to diode pumped solid state laser (DPSSL) technology and has successfully developed, realised and tested a variety of versatile HEL weapon demonstrators for air- and ground defence scenarios like countering rocket, artillery, mortar, missile (RAMM), unmanned aerial systems (UAS) and unexploded ordnances clearing. By employing beam superimposing technology and a modular laser weapon concept, the total optical power has been successively increased. Stationary weapon platforms, military vehicles and naval platforms have been equipped with high energy laser effectors. The contribution gives a summary of the most recent development stages of Rheinmetalls HEL weapon program. In addition to the stationary 30 kW laser weapon demonstrator, we present vehicle based HEL demonstrators: the 5 kW class Mobile HEL Effector Track V, the 20 kW class Mobile HEL Effector Wheel XX and the 50 kW class Mobile HEL Effector Container L and the latest 10 kW HEL effector integrated in the naval weapon platform MLG 27. We describe the capabilities of these demonstrators against different potential targets. Furthermore, we will show the capability of the 30 kW stationary Laser Weapon Demonstrator integrated into an existing ground based air defence system to defeat saturated attacks of RAMM and UAS targets.
莱茵金属Waffe弹药公司已经在高能激光(HEL)领域工作了30年,用于国防应用,从脉冲CO2到脉冲玻璃棒激光器。在过去的十年中,莱茵金属军情弹药公司改为二极管泵浦固体激光器(DPSSL)技术,并成功开发、实现和测试了各种多功能HEL武器演示,用于空中和地面防御场景,如反火箭、火炮、迫击炮、导弹(RAMM)、无人机系统(UAS)和未爆弹药清除。通过采用光束叠加技术和模块化激光武器概念,总光功率不断提高。固定式武器平台、军用车辆和海军平台已经装备了高能激光效应器。该报告总结了莱茵金属公司HEL武器计划的最新发展阶段。除了固定式30千瓦激光武器演示器外,我们还展示了基于车辆的HEL演示器:5千瓦级移动HEL效应器履带V, 20千瓦级移动HEL效应器轮XX和50千瓦级移动HEL效应器容器L以及集成在海军武器平台MLG 27中的最新10千瓦HEL效应器。我们描述了这些示威者针对不同潜在目标的能力。此外,我们将展示集成到现有地面防空系统中的30千瓦固定式激光武器演示器的能力,以击败RAMM和UAS目标的饱和攻击。
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引用次数: 8
Formation of the multi-terawatt laser beams in a visible spectrum region 在可见光谱区域形成多太瓦激光束
Pub Date : 2017-01-13 DOI: 10.1117/12.2256225
V. Losev
The results of multiterawatt laser beam formation of a visible range in THL-100 hybrid laser system based on titanium-sapphire front-end and photochemical XeF(C-A) boosting amplifier is presented. The front-end delivers up to 20 mJ energy in 50 fs pulses at the second harmonic centered around 475 nm. The active medium of the XeF(C-A) amplifier is produced in a XeF2/N2 mixture irradiated by the VUV radiation from electron beam excited xenon. The laser system is described and the latest results are presented.
介绍了基于钛蓝宝石前端和光化学XeF(C-A)增强放大器的THL-100混合激光系统在可见光范围内形成多太瓦激光束的结果。前端在以475 nm为中心的二次谐波处以50 fs脉冲提供高达20 mJ的能量。XeF(C-A)放大器的有效介质是在XeF2/N2混合物中产生的,该混合物由电子束激发氙的VUV辐射照射。介绍了激光系统,并介绍了最新的研究成果。
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引用次数: 3
Amplification of femtosecond pulses at 126 nm in optical field-induced plasma filamentation in Ar 光场诱导等离子体成丝中126 nm飞秒脉冲的放大
Pub Date : 2017-01-13 DOI: 10.1117/12.2256014
S. Kubodera, Kazuyuki Fujiyoshi, M. Kaku, M. Katto
We have observed an optical gain at the wavelength of 126 nm in an Ar excimer (Ar2 *) amplifier by utilizing a femtosecond vacuum ultraviolet (VUV) seed beam tuned at 126 nm. The maximum optical gain value of 1.1 cm-1 with a spatial distribution in the optical-field-induced ionization (OFI) Ar plasma was observed. The plasma diagnosis revealed that the plasma contraction near the plasma amplifier axis together with the plasma expansion was a key issue to observe such a high optical gain value inside the Ar plasma filament. The center axis of the contracted plasma amplifier showed the high electron density more than 1018 cm-3 even after 100 ns from the plasma production of Ar at 1 MPa. Our OFI plasma/excimer kinetics code reproduced the temporal progress of the optical gain distribution as well as the maximum gain value.
利用飞秒真空紫外(VUV)种子束在126nm调谐,在Ar准分子(Ar2 *)放大器中观察到波长为126nm的光学增益。在光场诱导电离氩等离子体中,最大光学增益值为1.1 cm-1,且具有一定的空间分布。等离子体诊断结果表明,等离子体在等离子体放大器轴附近的收缩与等离子体的膨胀是在氩等离子体灯丝内部观测到如此高的光增益值的关键。收缩等离子体放大器的中心轴在1mpa氩等离子体产生100 ns后仍显示出超过1018 cm-3的高电子密度。我们的OFI等离子体/准分子动力学代码再现了光学增益分布的时间进展以及最大增益值。
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引用次数: 0
Laser simulation at the Air Force Research Laboratory 空军研究实验室的激光模拟
Pub Date : 2017-01-13 DOI: 10.1117/12.2265048
J. Grosek, S. Naderi, Benjamin Q. Oliker, R. A. Lane, I. Dajani, T. Madden
The physics of high brightness, high-power lasers present a variety of challenges with respect to simulation. The Air Force Research Laboratory is developing high-fidelity models for Yb-doped, Tm-doped, and Raman fiber amplifiers, hollow-core optical fiber gas lasers, and diode pumped alkali lasers. The approach to simulation and the physics specific to each laser technology are described, along with highlights of results, and relevant modeling considerations and limitations.
高亮度、高功率激光器的物理特性在模拟方面提出了各种各样的挑战。美国空军研究实验室正在开发用于掺镱、掺铥和拉曼光纤放大器、空心芯光纤气体激光器和二极管抽运碱激光器的高保真模型。描述了模拟方法和每种激光技术的物理特性,以及结果的重点,以及相关的建模考虑和限制。
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引用次数: 6
Investigation of hollow beam generated by double axicons and its propagation properties 双轴产生的空心光束及其传播特性研究
Pub Date : 2017-01-13 DOI: 10.1117/12.2256489
Peng Wang, Xiao Li, Yaping Shang, Xiaojun Xu
The hollow beam has a variety of special physical properties and can be applied to the optical catheter, optical trap, generation of the light trap and many other important fields. In this paper the light-field conversion of the Gaussian beam passing through double axicons and generating the hollow beam is theoretical derived and simulated using the light-field propagation method. The influence of several parameters on the near and far field intensity distribution of the hollow beam is discussed. We find that the hollow beam with different light-field can be generated by controlling these parameters and this has a great potential in terms of micro manipulation, optical trap and other fields.
空心光束具有多种特殊的物理性质,可应用于光导管、光阱、产生光阱等许多重要领域。本文利用光场传播方法对高斯光束通过双轴产生空心光束的光场转换进行了理论推导和仿真。讨论了几个参数对空心光束近场和远场强度分布的影响。我们发现通过控制这些参数可以产生不同光场的空心光束,这在微操纵、光阱等领域具有很大的潜力。
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引用次数: 1
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International Symposium on High Power Laser Systems and Applications
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