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实验研究了超短脉冲激光的空间小尺度自聚焦的动态变化过程.具体实验过程是使经过正交细丝的衍射来实现激光的空间调制,然后通过非线性Kerr介质二硫化碳,随着输入功率的增大,超短脉冲开始出现小尺度自聚焦增长现象.实验发现,每个小尺度自聚焦峰值并不是随着功率的增大而无限地增长下去,而是在不同位置出现了新的调制增长点,这些新出现的增长与原有的增长相互竞争,最终导致了分裂成丝.通过数值模拟相应的传输过程,发现数值模拟结果与实验结果符合很好.
关键词:
小尺度自聚焦
高功率激光
超短脉冲 相似文献
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Y. B. Deng X. Q. Fu C. Tan H. Yang S. G. Deng C. X. Xiong G. F. Zhang 《Applied physics. B, Lasers and optics》2014,114(3):449-454
Small-scale self-focusing (SF) causes rapid increase in the partial spatial intensity, breaking up the spatial profile of the beam into an intensity increasing zone (IZ) and a non-increasing zone (NIZ). We measure the evolutions of the pulse width at the IZ and NIZ with small-scale SF, and our results show that the pulse width at the IZ becomes narrower with increasing partial spatial intensity. The pulse width at the NIZ is almost unchanged with increasing laser power. We find that our experimental results are in good agreement with an approximate theoretical analysis. 相似文献
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Sergey Mironov Vladimir Lozhkarev Grigory Luchinin Andrey Shaykin Efim Khazanov 《Applied physics. B, Lasers and optics》2013,113(1):147-151
An original method for suppressing small-scale self-focusing in laser beams with the intensity of several TW/cm2 has been proposed, justified theoretically and verified in experiment. The idea underlying the method is to filter spatial perturbations during beam propagation in free space. 相似文献
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Yang Yang Wen-Chun Wang De-Zheng Yang Li Jia Shuai Zhang 《Journal of Electrostatics》2012,70(4):356-362
A bi-directional nanosecond pulsed power supply is employed to generate diffuse dielectric barrier discharge in N2 using needle-plate electrode configuration at atmospheric pressure. Both discharge images and optical emission spectra of diffuse bi-directional nanosecond high-voltage pulsed dielectric barrier discharge are successfully recorded under severe electromagnetic interference. The diffuse performance of the discharge at different electrode gap distances is observed. The effects of pulse peak voltage, pulse repetition rate, electrode gap distance, He addition, and O2 addition on the optical emission spectra are investigated. The main physicochemical processes involved are discussed. 相似文献
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Guoqi Cui Xiaoyi Dong Qiuqin Sheng Mingtao YangHai Zhang Yanyun Zhang 《Chinese Journal of Lasers》1992,(6)
A theoretical analysis for the reported electric voltage controlled self-focusingeffect in BSO crystal is given.Further experiments is done to prove the theoretical result.Itshows that the theory is in consistent with the experimental results. 相似文献
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M. I. Demchuk I. A. Manichev V. P. Mikhailov I. N. Sisakyan A. B. Shvartsburg 《Optical and Quantum Electronics》1987,19(1):73-77
The value and sign of the ultrashort pulse (USP) chirp are studied experimentally in the YAG:Nd solid-state laser using different saturable absorbers. The effects of active and passive media as well as USP parameters on the chirp are analysed. The possibility of controlling the USP chirp value by selecting the initial passive locking density is shown. 相似文献
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We performed the femtosecond nondegenerate optical Kerr shutter (OKS) measurements in a 10-mm-thick optical glass. The time-resolved OKS signals showed an obvious asymmetry and a large broadening with respect to that for thin samples. The time-resolved OKS signals in samples with different thicknesses showed that, the temporal broadening of the OKS signals was attributed to the group velocity mismatch between pump and probe beams of different wavelengths. By imaging the filament induced inside the glass, we attributed the asymmetry of the time-resolved OKS signals to the focusing position change of pump beam caused by self-focusing and re-focusing effect. 相似文献
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为评估和研究工业以太网芯片KSZ8851-16MLLJ在空间环境中的适应性,利用重离子源对芯片进行了单粒子试验。根据以太网芯片的结构和功能制订了单粒子实验方案,得出了实验数据,并对实验数据进行了整理和研究。实验和研究表明:工业以太网芯片KSZ8851-16MLLJ具有一定的抗单粒子辐射能力;在不同网络传输条件下,发生单粒子翻转的机率也不相同;在持续的单粒子辐射下,以太网芯片会发生电流阶跃,第二次电流阶跃时产生单粒子锁定,在工程应用中可以利用电流阶跃监测芯片的辐射水平。 相似文献
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实验研究宽频带脉冲光束通过非线性介质时的非线性热像的形成过程,揭示了光束入射功率和脉冲宽度、介质厚度等因素对热像光强和位置的影响. 结果表明,与单纵模激光束一样,在宽频带脉冲光束情形下,非线性介质上游元件的模糊斑调制也可导致在下游共轭位置形成热像. 热像光强随入射光束功率的增加而增加;若脉冲能量一定,则热像光强随脉冲宽度的增加而减弱;若脉冲峰值功率一定,则热像光强随脉冲宽度的增加而增强.
关键词:
高功率激光
热像
宽带光束
小尺度自聚焦 相似文献