Laser Pointer work by using an energy source to excite a laser medium, which then releases a concentrated stream of photons. This stimulated emission process can increase the coherence of laser light under proper conditions. This work demonstrated that this is true, even in the X-ray region.
The team built their atomic laser based on copper atoms. The researchers exposed the foil to two X-ray pulses of different energies, generated by an X-ray free-electron laser; one pulse was tuned as a pump source and the other as a seed for the main Cat Chasing Laser Pointer . Yoneda and his team found that using the pumped copper medium in combination with the X-ray pulse acting as a seed for the main laser beam, greatly enhanced the coherence and energy extraction efficiency of the short-wavelength beam.
The researchers hope their ‘hard X-ray inner-shell atomic Green Star Laser Pointer 10mW will eventually produce ultrastable, high quality X-ray images, and could feasibly transform the fields of medicine, quantum optics and particle physics.
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