字幕表 動画を再生する 英語字幕をプリント 00:00:02,820 --> 00:00:05,760 We've all seen holograms, and what makes it special is its three-dimensional nature, which is much different than a perspective change on a photograph. We call many things holograms, but many are not. For example, many 3D projections, such as when they brought back Michael Jackson, is just a optical illusion where it's a projection of that individual. This is something we call Pepper's ghost. I'm here offering an IAP course here at MIT called Hands-On Holography. We cover geometrical optics. We cover the electromagnetic spectrum. We generate our own optical holograms as well as audio holograms, and we get into computational holograms as well. A big takeaway from this class is really understanding the wave mechanics of light and the electromagnetic spectrum. If we look at the two words in a hologram, it means "whole writing." And we take into account a special nature of light, which we call phase, and recorded it on a film plate using an interference pattern to recreate an entire scene in its entirety. People think of anything that appears three dimensional to be a hologram, but if it doesn't contain that phase nature, it is not a hologram. We have individuals ranging from art majors to engineers. We've even had some MIT staff themselves take this course. And we try to really give a intuitive feel for what is going on with holograms and interference patterns in general. I'm an optical engineer. I enjoy the wave nature of light. What makes holography really special is that we're able to extract that phase nature and that extra information and make use of it.