The invention of holography
Dennis’s main achievement was the invention of holography. As a physicist and senior engineer, in addition to holding more than 100 patents in his life, he also published He has published more than 80 papers, including transient oscilloscopes, gas discharge and plasma, electron optics and electron microscopy, communication theory and communication technology (television), and diffraction and interference microscopy of physical optics.
In 1956, he invented the orthogonal holography method, using traditional filtered light sources to create the basic technology of holography. With the advent of lasers in the 1960s, holography became a practical technology. Made a planar cathode ray tube, proposed matrix theory to form optical description, analytical signal theory and pulse compression principle in communication technology, and Gabor-Shannon theory in information theory.
At the same time, he was also obsessed with social issues and published three books: "Creating the Future" in 1963, "Innovation" in 1970 and "Mature Society" in 1972, listing social work as as the top priority in his lifetime.
The Royal Swedish Academy of Sciences awarded the 1971 Prize to Denis Gabor, a man who has obtained more than 100 invention patents, mainly due to his achievements in holography. Achievements can be thought of as discoveries or inventions. Dennis won the 1971 Nobel Prize in Physics, his highest honor, for his invention and development of holography.
Holography
Holography refers to a new photography technology that records all information such as the amplitude and phase of the reflected wave from the object. Ordinary photography records the light intensity distribution on the surface of an object. It cannot record the phase information of the reflected light from the object, thus losing the three-dimensional sense.
Google commemorates the 110th anniversary of the birth of Dennis Gabor
Holographic photography uses lasers as the illumination source, and divides the light from the light source into two beams, one beam is directed to the photosensitive film, The other beam is reflected by the object and then hits the photosensitive film. The two beams of light are superimposed on the photosensitive film to cause interference. The sensitivity of each point on the photosensitive film varies not only with the intensity but also with the phase relationship of the two beams of light. Therefore, holography not only records the reflection intensity on the object, but also records the phase information.
When the human eye looks directly at this photosensitive film, it can only see interference fringes like fingerprints. However, if a laser is used to illuminate it, the human eye can see the original photographed object through the film. Exactly the same three-dimensional image. Even if only a small part of a holographic image remains, the entire scene can still be reproduced. Holography can be used in industry for non-destructive testing, ultrasonic holography, holographic microscopes, holographic memory, holographic movies and television, and many other aspects.