脉冲式X射线束的连贯控制
M F DeCamp1, D A Reis, P H Bucksbaum
1Department of Physics and FOCUS Center, University of Michigan, Ann Arbor, Michigan 48109, USA. mattydee@umich.edu
Nature
|October 26, 2001
概括
研究人员开发了一种使用晶体中的声脉冲进行超快X射线调制的新方法. 这种技术使得在纳米秒时间尺度上的同步子束能够有效切换,用于原子尺度的运动研究.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 光学是什么?光学是什么?光学是什么?
背景情况:
- 同步子产生快速的X射线脉冲,这对于研究原子运动至关重要.
- 目前调节这些X射线束的方法往往不够快,无法实现超快的时间尺度 (从纳秒到femtoseconds).
- 需要高效的超快X射线调制器,与同步发射源兼容.
研究的目的:
- 为了证明同步龙X射线束的高效亚纳秒连贯切换.
- 探索在晶体内使用声脉冲进行X射线调制的方法.
- 研究用于超快X射线操纵的新技术.
主要方法:
- 利用晶体内产生的声脉冲来调节X射线脉冲的异常低损耗传输.
- 采用一个晶体在两个X射线束之间传输能量,时间尺度比同步子脉冲宽度短 (约. 100 ps) 的时间.
- 研究了几何安排,包括碰撞反传播的声脉冲,以增强调制频率和探测短暂应变.
主要成果:
- 实现了同步龙X射线束的高效亚纳秒连贯切换.
- 证明了散射X射线的千兆赫兹调制.
- 使用碰撞的声脉冲观察到X射线调制频率的翻倍,使局部的短暂应变观察成为可能.
结论:
- 对X射线传输的声学调制为超快速同步子束操纵提供了一种可行的方法.
- 开发的技术显示了通过激光诱导的语音调制来扩展到次数秒脉冲生成的潜力.
- 这一进步为现有的超快X射线功能提供了替代方案,这些功能通常仅限于激光生成的源或X射线线条相机.
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