共查询到19条相似文献,搜索用时 140 毫秒
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双池SBS系统由振荡池和放大池两部分组成.振荡池中产生的Stokes种子光进入放大池,与抽运光作用,产生强的放大,Stokes脉冲宽度变窄,能量转换效率提高.以往人们在振荡池和放大池中使用同一种介质,其目的是为了确保Stokes种子和抽运光的频差恰为布里渊频移.但是,当振荡池和放大池中使用同一种介质时,有时受到介质的吸收系数、增益系数、声子寿命和光学击穿阈值等的限制. 相似文献
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研制了一套输出能量在100 J以上的大能量高功率钕玻璃激光系统。在设计中,对光路排布进行了优化,对系统放大增益进行了数值模拟,采用像传递技术和受激布里渊散射(SBS)相位共轭技术,提高了激光束的输出质量。Nd:YLF前端输出的单纵模脉冲激光经过两级双程放大和一级助推放大,获得了106 J的能量输出。针对在大口径高能高功率激光系统中应用受激布里渊散射相位共轭镜的要求,设计了一种新型的受激布里渊散射相位共轭镜结构,这种结构克服了传统独立双池的缺点,完全适用于高能高功率激光的双程放大结构。 相似文献
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高功率准分子激光系统中的放大自发辐射(ASE)会引起主脉冲信号对比度下降,从而导致放大过程中激光脉冲信号对比度下降以及波形展宽和畸变,影响精密物理实验的开展。基于电光开关产生短脉冲的原理,对紫外波段电光开关进行了研究,建立了一种抑制准分子激光放大链ASE的方法。在对主振荡功率放大(MOPA)系统第一级预放大器的削波实验中,单电光开关和双电光开关消光比分别达到了103和104量级,削波后的激光脉冲信号对比度由原来的几十倍分别提高到105和106量级。在单路MOPA系统放大实验中,采用级联双电光开关进行了系统的ASE控制,并最终在靶面获得了良好的窄脉宽放大激光脉冲,为高功率准分子激光系统中波形放大问题提供了一个有效的解决方案。 相似文献
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YANG Jun LU Zhi-Wei HE Wei-Ming 《光电子快报》2007,3(6):473-476
A novel configuration of two Brillouin amplifiers, which contains a main amplifier combined with a reshaping amplifier, is suggested to control pulse shape of Stokes pulses with steep leading edge. Dependences of pulse shapes on several param- eters are numerically simulated. By changing the distance between the two amplifiers, the leading edge of amplified pulses can be finely adjusted. Smooth and symmetrical pulses or pulses with slow leading-edge are achieved. Theoretical re- searches prove that this system is fit for shaping pulses with steep leading edge, especially, for controlling leading edge of pulses. The results provide useful and necessary theoretical basis and guidance for the future experimental research. 相似文献
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将脉冲预泵浦的概念引入瑞利布里渊光时域分析系统,利用由传感脉冲和经微波调制的预泵浦脉冲组成的阶梯脉冲作调制信号,通过作为探测光的时间有限的预泵浦脉冲1阶边带的瑞利散射与传感脉冲的受激布里渊作用,实现布里渊信号的时域整形,减小非本地效应;通过预泵浦脉冲0阶基带和传感脉冲的受激布里渊作用,实现布里渊信号的谱域整形,有效地解决空间分辨率和测量精度之间的矛盾。利用频域法求解瞬态耦合波方程,建立了阶梯脉冲光在光纤中受激布里渊作用的解析模型。仿真结果表明,当传感脉冲宽度为5 ns、峰值功率为100 mW,预泵浦脉冲宽度为50 ns、峰值功率为16 mW时,在空间分辨率0.5 m内受激布里渊散射增益在0.14 m处达到最大值,然后近似线性下降至0.37 m处,其余位置近似为零;系统布里渊散射谱宽近似为35 MHz,约为传统瑞利布里渊光时域分析系统布里渊谱宽212 MHz的1/6,在相同空间分辨率下提高了频率测量精度。 相似文献
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Experimental and modeling studies of a Brillouin amplifier 总被引:5,自引:0,他引:5
Offenberger A.A. Thompson D.C. Fedosejevs R. Harwood B. Santiago J. Manjunath H.R. 《Quantum Electronics, IEEE Journal of》1993,29(1):207-216
KrF laser-pumped backward Brillouin amplification of nanosecond pulses at 248 nm is investigated both experimentally and numerically. Gain and saturation of the amplifier system are studied for an SF6 Brillouin medium at pressures of 5 to 15 atm and 24 ns pump pulses at an intensity of ≈9 MW/cm2. The input Stokes intensity is varied from 0.001 to 1.0 MW/cm2. Power gains of 20 are achieved at energy extraction efficiencies of 40%. Experimental results are compared to a time dependent numerical model of pulse amplification which incorporates arbitrary pump and Stokes pulse shapes and intensities. The effect of laser bandwidth is investigated in the model calculations in order to assess its influence on Brillouin amplification 相似文献
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1064nm可编程半导体激光脉冲种子源的研究 总被引:1,自引:0,他引:1
为了运用主振功率放大技术获得纳秒量级的高功率密度激光脉冲,设计了一种运用于主振功率放大的半导体激光种子源,通过编程可输出多种形状光脉冲,并采用主动脉冲外形控制技术提高了输出光脉冲的波形质量。实验中研制了高速大电流驱动模块和可编程多种调制波形发生器,并采用了1064nm量子阱分布反馈的大功率半导体激光器。结果表明,该种子源脉冲光功率优于200mW、动态范围优于20dB、脉冲宽度40ns~1μs和重复频率0MHz~5MHz可调,可编程控制输出多种波形。 相似文献
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Dane C.B. Zapata L.E. Neuman W.A. Norton M.A. Hackel L.A. 《Quantum Electronics, IEEE Journal of》1995,31(1):148-163
The design and operation of a Nd:glass regenerative amplifier using a stimulated Brillouin scattering (SBS) phase conjugate mirror is presented. The system can be operated at 25-30 J per pulse with a pulse width of 14 ns and a pulse repetition frequency (PRF) of 6 Hz. This results in an average output power of >150 W with a peak power of 2 GW. The experimentally measured divergence of the amplifier output is 1.25× the diffraction limit and it can be frequency doubled with >80% efficiency. The detailed considerations required for this specific amplifier design are discussed as well as how these considerations apply to the design of high average power, high beam quality laser systems in general 相似文献
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研究实现了一种主振荡功率放大(MOPA)结构的高功率全光纤皮秒级被动锁模掺镱(Yb3+)光纤激光器。种子源为基于半导体可饱和吸收镜(SESAM)的锁模光纤激光器,其为线性腔结构,输出功率为5.97 mW;预放大级采用单模掺镱光纤进行放大,之后经过4倍重复频率倍增系统和两级双包层掺镱光纤放大器,最终实现了平均功率74.3 W,中心波长1063.4 nm,脉冲宽度7.0 ps,重复频率68 MHz的锁模脉冲激光输出。实验中通过对种子光的处理和光纤长度的控制,未出现受激布里渊散射(SBS)、受激拉曼散射(SRS)等非线性效应。 相似文献
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The performance of an atomic iodine laser amplifier chain with output pulse powers close to 2 TW is analyzed by a numerical solution of the Maxwell-Bloch equations. Two subjects are discussed in detail. The first one refers to the pulse compression occurring in the chain as a result of saturation and some related aspects such as damage to components, self-focusing, correlations between the input and output pulse shapes, and the means of pulse shape control. The second deals with various schemes suited for achieving extraction efficiencies of about or larger than 55 percent. These include the single-pass and double-pass schemes, pulses with two carrier frequencies, and a variation of the pulse carrier frequency. In addition, the response of the chain to a variation of those parameters which are most easily subject to change in a routine operation is investigated. 相似文献
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受激布里渊散射在ICF激光驱动器中的应用 总被引:2,自引:0,他引:2
本文概述了基于受激布里渊散射 (SBS)的位相共轭镜 (PCM )在惯性约束核聚变 (ICF)激光驱动器领域的实际应用 ,着重介绍了在高功率条件下 ,PCM的能量和功率负载强度、位相保真度和波形控制等关键问题。指出在超饱和工作条件下 ,采用SBS放大器—振荡器双池结构的PCM ,在获得高反射率、高保真度、可控脉冲输出的同时 ,不会增加激光系统的不稳定性。 相似文献