Scene illuminated by a femtosecond laser and captured at a trillion FPS, Camera Culture, MIT

We have built an imaging solution that allows us to visualize propagation of light at an effective rate of one trillion frames per second. Direct recording of light at such a frame rate with sufficient brightness is nearly impossible. We use an indirect 'stroboscopic' method that combines millions of repeated measurements by careful scanning in time and viewpoints.

The device has been developed by the MIT Media Lab's Camera Culture group in collaboration with Bawendi Lab in the Department of Chemistry at MIT. A laser pulse that lasts less than one trillionth of a second is used as a flash and the light returning from the scene is collected by a camera at a rate equivalent to roughly 1 trillion frames per second. However, due to very short exposure times (roughly one trillionth of a second) and a narrow field of view of the camera, the video is captured over several minutes by repeated and periodic sampling.

For more info visit http://raskar.info/trillionfps
http://femtophoto.info
http://www.nytimes.com/2011/12/13/sci...
http://web.mit.edu/newsoffice/2011/tr...
http://cornar.info
http://www.slideshare.net/cameracultu...

Music: "Rising" by Kevin MacLeod (http://music.incompetech.com/royaltyf...)

• Category

  Science & Technology

[Cody R]

LOL, who disliked this? Are there seriously people out there who see this and think, "Pfft, only a TRILLION frames per second?"

[DOPEFRESHBRAH]

I could think of so may fun things to do with this camera... I wonder how much it costs?

[animate2d]

the moment in time that it happens can be captured to great resolution therefore when you put it all together they can create this imagery. So even though it take lets say 1 microsecond to register a photon, if you space your pulses out over two microseconds the resolution in time enables the reconstruction. Not sure if this makes sense. What I don't understand is how the wave fronts move backwards. Isn't it possible for light exit the door before it got there in the first place.

[animate2d]

team up with this guy to show the time evolution of self interfering attosecond pulses: faculty.physics.tamu.edu/ggp/P­ublications/051-AttosecondDoub­leSlit.pdf

[Privyet677]

a dollar per frame

[theproletariet]

Did you read the description. They are taking several single shots of a picosecond laser, and measuring the response at various time intervals. It isnt following the propagation of a single wave packet, but as many as there are frames.

What I dont get is what does this help with

[MrPointless]

How do you register something on a digital device that moves faster than the speed of an electron in your device, and definitely faster than the stream of electrons needed to carry the amount of information? I really don't get how it works.

[Cassio Rodrigues]

Com certeza o experimento nos trouxe imagens surpreendentes, nunca antes vista! Sobre sempre nos limitar a velocidade da luz, o futuro é incerto, mas ainda acredito nas teorias de Einstein... Vamos deixar como dica nos comentários para o próximo experimento um feixe de luz convergente atravessando um prisma ?!

[Felipe Sousa]

correto. O efeito foi muito bom mesmo assim. Não sei se sempre nos limitaremos á velocidade da luz, mas pelo menos sabemos como ela se comportaria se vissemos ela nessa velocidade. QUeria que eles fizessem de um prisma, o que você me diz?

[flamiliamelgaco]

I tried to this at home then i got an arrow in the knee

[Cassio Rodrigues]

Post Scriptum: Leiam de baixo para cima, sequência correta de postagem para leitura !

Está é a explicação @Kaeralho