A new type of optical crystal was discovered by the Institute of Physical and Chemical Technology, Chinese Academy of Sciences-potassium fluoroboronate

With the title of "China's Hidden Crystals", the team led by Academician Chen Chuangtian of the Institute of Physical and Chemical Technology of the Chinese Academy of Sciences discovered and grown a new type of optical crystal-potassium fluoroboronium beryllium (KBBF) crystal It reported in detail and stated that "Chinese laboratories have become the only source of this kind of crystals of great scientific value, which shows that China's strength in the field of materials science is increasing day by day."

KBBF crystal is currently the only non-linear optical crystal that can directly generate frequency double frequency to generate deep ultraviolet laser. It is the third "made in China" non-linear optical crystal after the barium borate and lithium triborate crystals in the field of nonlinear optical crystal research. . "Nature" magazine said: "Research on crystal growth in other countries does not seem to narrow the gap with China."

After 18 years of research, the team of Chen Chuangtian used "local spontaneous nucleation growth technology" to break through the technical bottleneck of large-size KBBF crystal growth, and grew the largest transparent bulk KBBF single crystal to date, combined with the nonlinear optics they invented The patented prism coupling technology of the crystal successfully produced the optical contact prism coupling device with a KBBF crystal thickness of 2.3 mm, ensuring the practicality and precision of generating deep ultraviolet laser. This technology laid the foundation for the all-solid-state light source required in the 193-nanometer lithography system. At present, the technology has been granted invention patents in China, the United States and Japan.

The KBBF crystal can shorten the wavelength of the laser. Various lasers equipped with the crystal can emit ultraviolet light waves with an extremely narrow bandwidth. The resolution of the solid electron level can be measured to 360 microelectronic volts; it can be used to build ultra-high-resolution photoelectrons. Frontier scientific research such as energy spectrometer, superconducting measurement, and lithography will have a profound impact on future micro-nano processing, biomedicine, and laser TV.

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