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首页> 外文会议>Society of Photo-Optical Instrumentation Engineers Conference on Soft X-Ray Lasers and Applications >Improved energy coupling into the gain region of the Ni-like Pd transient collisional x-ray laser
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Improved energy coupling into the gain region of the Ni-like Pd transient collisional x-ray laser

机译：改进的能量耦合到Ni样PD瞬态碰撞X射线激光器的增益区

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We present within this paper a series of experiments, which yield new observations to further our understanding of the transient collisional x-ray laser medium. We use the recently developed technique of picosecond x-ray laser interferometry to probe the plasma conditions in which the x-ray laser is generated and propagates. This yields two dimensional electron density maps of the plasma taken at different times relative to the peak of the 600ps plasma-forming beam. In another experimental campaign, the output of the x-ray laser plasma column is imaged with a spherical multilayer mirror onto a CCD camera to give a two-dimensional intensity map of the x-ray laser output. Near-field imaging gives insights into refraction, output intensity and spatial mode structure. Combining these images with the density maps gives an indication of the electron density at which the x-ray laser is being emitted at (yielding insights into the effect of density gradients on beam propagation). Experimental observations coupled with simulations predict that most effective coupling of laser pump energy occurs when the duration of the main heating pulse is comparable to the gain lifetime (～10ps for Ni-like schemes). This can increase the output intensity by more than an order of magnitude relative to the case were the same pumping energy is delivered within a shorter heating pulse duration (<3ps). We have also conducted an experiment in which the output of the x-ray laser was imaged onto the entrance slit of a high temporal resolution streak camera. This effectively takes a one-dimensional slice of the x-ray laser spatial profile and sweeps it in time. Under some conditions we observe rapid movement of the x-ray laser (～3μm/ps) towards the target surface.
机译：我们提出了本文中的一系列实验中，其产生新的观测，以进一步我们的瞬态碰撞X射线激光介质的理解。我们使用皮秒X射线激光干涉的最近开发的技术来探测，其中所述x射线激光产生并传播该等离子体条件。这产生二维电子密度映射在相对于600 ps的等离子体形成光束的峰值不同时间拍摄的等离子体。在另一个实验系列，X射线激光等离子柱的输出与球形多层反射镜成像到CCD照相机，得到X射线激光输出的二维强度分布图。近场成像给出见解折射，输出强度和空间模式的结构。与密度图组合这些图像给出了该X射线激光器在（屈服见解密度梯度对光束传播的影响）被发射的电子密度的指示。再加上模拟实验观察预测当在主加热脉冲的持续时间是可比的增益寿命发生激光泵浦能量的最有效的耦合（〜对于10马力类镍方案）。这可以通过比相对于壳体一个数量级以上增加的输出强度在相同的泵浦能量被更短的加热脉冲持续时间（<3PS）内输送。我们还进行，其中所述x射线激光器的输出被成像到高时间分辨率条纹相机的入口狭缝的实验。这有效地取X射线激光空间分布和扫描它在时间上的一维片。在一些条件下，我们观察到的X射线激光器（〜3μm的/ ps）的朝向所述目标表面的快速运动。

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