In order to reveal some continuous physical changes and life activities in the microscopic world, Russian researchers recently developed a holographic digital camera capable of displaying 20 trillion times per second and capable of displaying the dynamic state of the subject under study.
Holographic photography refers to the photographic technique of recording the amplitude and phase of all light waves in transmitted and reflected light when a light wave is transmitted through or reflected by an object. After coding useful light wave information and reconstructing images from different perspectives by using information technology, three-dimensional stereoscopic images of the subject can be displayed when needed.
Researchers at the National Institute of Information Technology, Mechanics and Optics in St. Petersburg, Russia, reported in the Applied Physics Letters in the United States that the disrupted displacement of Mars and biological cells stimulated by the combustion of an object lasts only for nanoseconds One hundred millionth of a second) class phenomenon. Although this transient phenomenon can be observed with femtosecond (thousandths of a second) laser pulse scanning, it is difficult to obtain a stereoscopic image showing its continuous variation.
To solve this problem, researchers at the school made a holographic digital camera that shoots 20 trillion shots per second using femtosecond laser pulses. The laser emitted by the device will be converted into three pulsed lasers through a beam splitter. The highest intensity of laser beam A, which can heat and excite the molecule under study; the laser beam B will then penetrate the studied material from the other direction, And scatters on the atom of the substance. This scattered light is called object light. The C-beam laser is used as reference light to pass near the object under study. After that, the object light and the reference light are superimposed on the recording medium and generate interference fringe patterns.
Russian researchers used the computer to process and interpret this image. After comparing the difference between the arrival of the reference light and the recording medium, the amplitude and phase of all the light waves contained in the object light were determined. Based on these coherent information acquired by UHF photography, three-dimensional images reflecting the continuous changes of the studied material can be generated.
In his study, engineer Chopin Kim introduced that a research team used a laser pulse emitted by this digital camera to excite Mars on the object's combustion and successfully captured a holographic stereoscopic image of the trajectory of the Mars burst. The expert also believes that after adjusting the intensity and pulse duration of the femtosecond laser, it is expected that the dynamic changes of biological cells and viruses will be captured by this camera. In addition, the technology provides new insights into the electronic transitions associated with changes in electron energy.
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