相关实验视频
Updated: Jul 1, 2025
10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
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概括
这项研究引入了基于声光调制器 (AOM) 的脉冲塑造器,使用布鲁斯特镜,实现更高的效率和分散补偿. 这种新设计成功地产生了用于光谱分析的超短脉冲.
科学领域:
- 光学和光子学 在光学和光子学.
- 材料科学 材料科学 材料科学
背景情况:
- 声光调制器 (AOM) 广泛用于光谱过.
- 传统的脉冲造型器经常使用,这可能是低效的,并引入分散.
研究的目的:
- 开发一种使用布鲁斯特镜的新型频域脉冲造型器.
- 为了提高基于AOM的脉冲造型器的效率和分散补偿能力.
主要方法:
- 实施了一个脉冲塑造器,使用布鲁斯特镜而不是格子.
- 在波长范围为520-660nm和840-1170nm之间测试了设备.
- 使用造型器产生50 femtosecond以下的脉冲.
主要成果:
- 与基于网格的系统相比,实现了效率的三倍增长.
- 成功地弥补了由AOM引入的时间分散.
- 在测试波长频段中产生超短脉冲 (低于50 fs).
结论:
- 基于布鲁斯特镜的AOM脉冲造型器提供了显著的效率提升.
- 这项技术使得在超短脉冲生成时能够有效地进行分散补偿.
- 形状器成功地被应用到通过二维白光光谱学来表征半导体碳纳米管.
相关概念视频
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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01:19Rectangular and Triangular Pulse Function
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The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,
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