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translator: joseph genireviewer: thu-huong ha doc edgerton inspired uswith awe and curiosity with this photo of a bulletpiercing through an apple, and exposure just a millionth of a second. but now, 50 years later,we can go a million times faster and see the worldnot at a million or a billion, but one trillion frames per second. i present to youa new type of photography, femto-photography,

a new imaging technique so fast that it can create slow motionvideos of light in motion. and with that, we can create camerasthat can look around corners, beyond line of sight, or see inside our body without an x-ray, and really challengewhat we mean by a camera. now if i take a laser pointerand turn it on and off in one trillionth of a second -- which is several femtoseconds --

i'll create a packet of photonsbarely a millimeter wide. and that packet of photons, that bullet, will travel at the speed of light, and again, a million times fasterthan an ordinary bullet. now, if you take that bulletand take this packet of photons and fire into this bottle, how will those photonsshatter into this bottle? how does light look in slow motion? [light in slow motion ...10 billion x slow]

now, the whole event -- (applause) now remember, the whole eventis effectively taking place in less than a nanosecond -- that's how much timeit takes for light to travel. but i'm slowing down in this videoby a factor of 10 billion, so you can see the light in motion. (laughter) but coca-cola did notsponsor this research.

now, there's a lot going on in this movie, so let me break this downand show you what's going on. so the pulse entersthe bottle, our bullet, with a packet of photonsthat start traveling through and that start scattering inside. some of the light leaks,goes on the table, and you start seeingthese ripples of waves. many of the photonseventually reach the cap and then they explodein various directions.

as you can see, there's a bubble of air and it's bouncing around inside. meanwhile, the ripplesare traveling on the table, and because of the reflections at the top, you see at the back of the bottle,after several frames, the reflections are focused. now, if you take an ordinary bullet and let it go the same distanceand slow down the video -- again, by a factor of 10 billion --

do you know how long you'll have to sithere to watch that movie? a day, a week? actually, a whole year. it'll be a very boring movie -- of a slow, ordinary bullet in motion. and what about somestill-life photography? you can watch the ripples,again, washing over the table, the tomato and the wall in the back. it's like throwing a stonein a pond of water. i thought: this is hownature paints a photo,

one femto frame at a time, but of course our eye seesan integral composite. but if you look at this tomatoone more time, you will notice, as the lightwashes over the tomato, it continues to glow. it doesn't become dark. why is that? because the tomato is actually ripe, and the light is bouncingaround inside the tomato, and it comes out after severaltrillionths of a second.

so in the future, when this femto-camerais in your camera phone, you might be able to go to a supermarket and check if the fruit is ripewithout actually touching it. so how did my team at mitcreate this camera? now, as photographers, you know, if you take a short exposure photo,you get very little light. but we're going to go a billion timesfaster than your shortest exposure, so you're going to get hardly any light. so what we do is we send that bullet --

that packet of photons --millions of times, and record again and againwith very clever synchronization, and from the gigabytes of data, we computationally weave together to create those femto-videos i showed you. and we can take all that raw dataand treat it in very interesting ways. so, superman can fly. some other heroes can become invisible. but what about a new powerfor a future superhero:

to see around corners. the idea is that we couldshine some light on the door, it's going to bounce, go inside the room, some of that is going to reflectback on the door, and then back to the camera. and we could exploitthese multiple bounces of light. and it's not science fiction.we have actually built it. on the left, you see our femto-camera. there's a mannequin hidden behind a wall,

and we're going to bouncelight off the door. so after our paper was publishedin nature communications, it was highlighted by nature.com, and they created this animation. (music) [a laser pulse is fired] ramesh raskar: we're going to firethose bullets of light, and they're going to hit this wall, and because of the packet of the photons,

they will scatter in all the directions, and some of them will reachour hidden mannequin, which in turn will againscatter that light, and again in turn, the door will reflectsome of that scattered light. and a tiny fraction of the photonswill actually come back to the camera, but most interestingly, they will all arriveat a slightly different time slot. and because we have a camerathat can run so fast -- our femto-camera --it has some unique abilities.

it has very good time resolution, and it can look at the worldat the speed of light. and this way, we know the distances,of course to the door, but also to the hidden objects, but we don't know which pointcorresponds to which distance. by shining one laser,we can record one raw photo, which, if you look on the screen,doesn't really make any sense. but then we will takea lot of such pictures, dozens of such pictures,put them together,

and try to analyzethe multiple bounces of light, and from that, can we seethe hidden object? can we see it in full 3d? so this is our reconstruction. now, we have some ways to go before we take thisoutside the lab on the road, but in the future, we could createcars that avoid collisions with what's around the bend. or we can look for survivorsin hazardous conditions

by looking at light reflectedthrough open windows. or we can build endoscopes that can seedeep inside the body around occluders, and also for cardioscopes. but of course,because of tissue and blood, this is quite challenging, so this is really a call for scientists to start thinking about femto-photography as really a new imaging modality to solve the next generationof health-imaging problems.

now, like doc edgerton,a scientist himself, science became art -- an art of ultra-fast photography. and i realized that all the gigabytes of datathat we're collecting every time, are not just for scientific imaging. but we can also do a new formof computational photography, with time-lapse and color coding. and we look at those ripples.

remember: the time between each of those ripplesis only a few trillionths of a second. but there's also somethingfunny going on here. when you look at the ripplesunder the cap, the ripples are moving away from us. the ripples should be moving towards us. what's going on here? it turns out, because we're recordingnearly at the speed of light, we have strange effects,

and einstein would have lovedto see this picture. the order at which eventstake place in the world appears in the camerasometimes in reversed order. so by applying the correspondingspace and time warp, we can correct for this distortion. so whether it's for photographyaround corners, or creating the next generationof health imaging, or creating new visualizations, since our invention,

we have open-sourced all the dataand details on our website, and our hope is that the diy,the creative and the research communities will show us that we should stop obsessingabout the megapixels in cameras -- and start focusingon the next dimension in imaging. it's about time. thank you.