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首页> 外文会议>Conference on Soft X-Ray Lasers and Applications V; Aug 6-7, 2003; San Diego, California, USA >Coherence Measurements of a Transient 14.7 nm X-ray Laser
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Coherence Measurements of a Transient 14.7 nm X-ray Laser

机译：14.7 nm瞬态X射线激光的相干测量

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摘要

We present the longitudinal coherence measurement of the transient inversion collisional x-ray laser for the first time. The Ni-like Pd x-ray laser at 14.68 nm is generated by the LLNL COMET laser facility and is operating in the gain-saturated regime. Interference fringes are produced using a Michelson interferometer setup in which a thin multilayer-coated membrane is used as a beam splitter. The longitudinal coherence length for the picosecond duration 4d~1S_0→4p~1P_1 lasing transition is determined to be ～400μm (1/e HW) by adjusting the length of one interferometer arm and measuring the resultant variation in fringe visibility. This is four times improved coherence than previous measurements on quasi-steady state schemes largely as a result of the narrower line profile in the lower temperature plasma. The inferred gain-narrowed linewidth of ～0.29 pm is also substantially narrower than previous measurements on quasi-steady state x-ray laser schemes. This study shows that the coherence of the x-ray laser beam can be improved by changing the laser pumping conditions. The x-ray laser is operating at 4 ― 5 times the transform-limited pulse.
机译：我们首次提出了瞬态反转碰撞X射线激光的纵向相干测量。 LLNL COMET激光设备产生了14.68 nm的Ni类Pd X射线激光，并在增益饱和状态下工作。干涉条纹是使用迈克尔逊干涉仪设置产生的，其中使用多层多层薄膜作为分束器。通过调节一个干涉仪臂的长度并测量由此产生的条纹可见度变化，可以确定皮秒持续时间4d〜1S_0→4p〜1P_1激光跃迁的纵向相干长度为〜400μm（1 / e HW）。相干性比以前在准稳态方案上的测量结果提高了四倍，这主要是因为低温等离子体中的线轮廓更窄。推断的〜0.29 pm的增益变窄的线宽也比以前在准稳态X射线激光方案上的测量结果要窄得多。这项研究表明，可以通过改变激光泵浦条件来改善X射线激光束的相干性。 X射线激光器的工作频率为变换限制脉冲的4到5倍。

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