Release date: 2007-05-25

New technology makes small X-ray lasers possible Recently, a research team at Colorado State University, Boulder, has developed a new technology that produces laser-type x-ray beams, eliminating the need to explore the desktop for decades. A major obstacle in the process of x-ray lasers.
Research team henry kapteyn and margaret murnane, professor of physics at the University of Cork University's Pod Campus, the leader of the team at jila (the association between the University of California and the US National Bureau of Standards), said that for nearly half a century, scientists have been Trying to create an x-ray laser that is reasonably priced and easily accepted at the same time to provide ultra-high image resolution. Most of today's x-ray lasers require huge amounts of energy. The fusion laser device alone is as big as a football field, making its use impractical. Professor Kapteyn said: "We finally found a way to avoid such a huge amount of energy." They published an article on the subject in the online edition of the Journal of Natural Physics.
If they continue to develop this new technology and extend it to the hard x-ray region of the electromagnetic spectrum (they think this is only a matter of time, because there are no physical barriers to the principle problem), then the result will be Used in many fields. Professor Murnane said: "If we can do this, we can increase the image resolution of x-rays by a thousand times, and it will also affect pharmaceutical, biological and nanotechnology. For example, the current x-rays in hospitals. The source is the same size as a light bulb, which causes the x-rays used in hospitals to be limited by spatial resolution, so it can't detect very small tumors. If you have bright, laser-like x-ray beams, you can form ultra-high resolution. Rate of images."
To produce a laser-like x-ray beam, the team used a powerful laser to pull an electron from an argon atom (a highly stable chemical element) and then refill the same atom. This coming and going behavior produces a weak, but straight, x-ray.
According to Professor Kapteyn, the problem they need to solve is to combine different x-ray waves emitted from a large number of atoms to produce a sufficiently bright x-ray beam that can be used. In other words, they need to generate enough large waves of light to flow together to create powerful x-rays.
Professor Murnane also revealed that the biggest problem they are currently facing is that because visible lasers and x-rays propagate at different speeds in argon, x-ray waves are not all "phase-synchronized". This means that when some x-ray waves become more intense in combination with light waves from similar areas, they are cancelled by light waves from different areas, which weakens the x-ray output.
To improve this problem, the researchers delivered some weak pulses of visible laser light into the gas in the opposite direction of the laser beam to produce x-rays. The weak laser beam processes the electrons that are pulled out of the argon atom and are out of sync with the main beam, and then quickly sends them back to the atoms at the right time to excite the x-rays, thus enhancing the beam intensity by a hundredfold.
Professor Kapteyn explained: “Like a child swinging, if you always push at the right time, the swing will be higher and higher, but if the time you push is not correct, then the swing will eventually stop. In fact, we This discovery is essentially - to push the swing at the right time, but we are not studying the swing but controlling the beam. Putting the light in the right position, we will not push the swing at the wrong time." Shanghai Medical Device Industry Association

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