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首页> 外文会议>Laser Medicine and Surgery; Progress in Biomedical Optics and Imaging; vol.6 no.35 >Development of Highly Advanced Soft X-Ray Lasers for Biomedical and Nano-Laser Medicine Applications
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Development of Highly Advanced Soft X-Ray Lasers for Biomedical and Nano-Laser Medicine Applications

机译：用于生物医学和纳米激光医学应用的高度先进的软X射线激光器的开发

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摘要

Current activities on our research of soft X-ray lasers and higher harmonic generations using intense, subpicosecond lasers are reviewed. Especially for soft X-ray lasers we experimentally demonstrate that by longitudinally pumping 2-mm-long molybdenum preformed plasma with high-intensity 475 fs duration laser pulse, a highly directive soft-X-ray laser at 18.9 nm wavelength is generated. The divergence of the beam is evaluated to be of the submillirad order, and only requires pump laser energy of 150 mJ. Simulations show that the pedestal in the main pump pulse can generate electron density and gain profiles with large spatial gradients, which result in the selective amplification of low-order transverse modes. The present result is the demonstration of an efficient and alternative method of improving the spatial coherence of X-ray lasers with amplified spontaneous emission medium, with possibilities of becoming an excellent tool to explore various application experiments. In higher harmonic generation, topics related to observation of blue shift due to collisionless absorption process is described.
机译：回顾了我们在研究软X射线激光器和使用高强度，亚皮秒激光器产生高次谐波方面的最新活动。尤其是对于软X射线激光器，我们通过实验证明，通过以高强度475 fs持续时间的激光脉冲纵向泵浦2毫米长的钼预制等离子体，可以生成波长为18.9 nm的高定向软X射线激光器。光束的发散估计为亚毫米级，仅需要150 mJ的泵浦激光能量。仿真表明，主泵浦脉冲中的基座可以产生具有大空间梯度的电子密度和增益分布，从而导致低阶横向模的选择性放大。目前的结果证明了一种有效且可替代的方法，可以提高具有放大的自发发射介质的X射线激光器的空间相干性，并有可能成为探索各种应用实验的出色工具。在高次谐波的产生中，描述了与由于无碰撞吸收过程引起的蓝移的观察有关的主题。

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