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绚丽梦幻的光线“分支流”现象 – 译学馆
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绚丽梦幻的光线“分支流”现象

The laser show in a soap bubble

This dancing laser display
这样的激光舞蹈表演
is a behavior never seen
作为一种光线的表现形式
before in light.
之前从未有人见到过
It’s called branch flow,
它被称为“分支流”
a phenomenon where a beam splits along its path.
是一种光线沿传播路径不断分叉的现象
In theory, it could happen
理论上讲 任何形式的波
to any form of wave under the right conditions.
在适当的条件下 都会产生这种现象
Here, the complex pattern is
这样复杂的图案
created with a laser and a simple soap bubble,
是利用激光和简单的肥皂泡制造出来的
and this experiment is
通过这项实验
shedding new light on the phenomenon.
人们对“分支流”现象有了全新的了解
光的“分支流”
A number of things can happen when a wave,
光波 任何光波在穿过介质时
any wave travels through a medium.
都会有很多情况发生
Certain random variations in a medium
当光波在介质中传播时
can cause the wave to spread out,
介质中的随机变化
others will keep the wave focused as it travels.
有的让光波发生散射 有的让光波保持聚集
But if the wave travels through just the right kind of medium,
如果光波的传播介质选择正确
you end up with that’s right, branched flow.
最终你就会观察到“分支流”现象
The beam divides up into an intricate tree-like pattern.
光线不断分叉 形成复杂的树状图案
For branched flow to occur,
想要产生“分支流”现象
the medium’s random structure
介质自身的随机结构
must be larger than the wave’s wavelength
就必须比光波的波长更长
and has to vary smoothly in all directions.
并且 其在所有方向上的变化都必须是平滑的
Researchers first spotted this wave behavior in 2001
2001年 在具有波动性的电子中
in electrons which can behave like waves.
研究人员首次观测到了“分支流”现象
Scientists have also spotted branched flow with
另外 在微波甚至在海啸中
microwaves and have even seen hints of it in tsunamis.
科学家们也都观测到了这种现象
But the phenomenon still hadn’t been
不过 “分支流”现象一直到现在
recreated in visible light until now.
才在可见光中被重现出来
A group of researchers shone a laser beam
沿着肥皂泡的弧形薄膜
along the curved film of a soap bubble.
研究团队发射了一束激光
To their surprise,
让人惊喜的是
the light split into filaments as it traveled.
激光在传播中分叉形成了细丝
It turned out that
事实证明
variations in the bubble’s thickness were creating the branched flow phenomenon.
“分支流”现象是肥皂泡厚度变化造成的
The team also investigated
另外 研究团队还研究了
the branching for flat bubble films.
平面肥皂薄膜上的“分支流”现象
As the soapy surface
激光分支图案会
fluctuates, the branching pattern evolves.
随着肥皂薄膜变动而逐渐变化
Shining a separate light on the bubble film from above
从上方向肥皂泡薄膜投射一束独立的激光
reveals how thick the bubble is in different places.
能让人们知道 肥皂泡不同区域的厚度
And the team used this information to investigate
研究团队利用这个信息来研究
how properties of the branching pattern,
激光分支图案的特性
like the average position of the first branch,
比如 首个分叉点的平均位置
are affected by the bubble.
是如何受到肥皂泡影响的
These bubbly experiments aren’t easy to set up.
这些充满肥皂泡的实验做起来并不容易
Getting the light to travel inside the bubble film
让激光在肥皂泡薄膜中传播
is particularly fiddly.
是一件很麻烦的事情
And it’s hard to study something when your ap
实验中肥皂薄膜容易破裂
paratus has a tendency to pop.
也让研究变得不容易
But now that the team have shown how to create this phenomenon with light.
但既然展示了如何利用激光产生“分支流”现象
They expect other groups around the world
研究团队认为全球其他的研究团队
to investigate it, too.
也会对此展开研究
The experiment could help physicists
这项实验能让物理学家们
understand the branch flow behavior.
更好地了解“分支流”现象
This could one day open the door to applying it to certain tasks,
总有一天会将其成功应用到某些任务中
such as probing the properties of biological membranes.
比如 对生物膜特性的研究
So there’s still plenty to
关于激光树状“分支流”
learn from this tree of light.
我们还有很多需要了解的地方

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视频概述

绚丽梦幻的光线“分支流”现象,解密光线的绝美和神秘。

听录译者

Judhen

翻译译者

翻译爱好者山人乙

审核员

审核员SX

视频来源

https://www.youtube.com/watch?v=UNCNp1tBqKY

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