Chineză Oameni de știință Dezvoltare Ultra-subțire, Eficient energetic Optic Cristal

Optical cristal poate realiza frecventa conversie, parametric amplificare, semnal modulatie and alt functii, is the "heart" of laser technology. After years of research, the Peking University team creatively put forward a new optical crystal theory, and the application of light element material bor nitride for the first time to pregate...
Optical cristal can realize frequency conversion, parametric amplificare, semnal modulation and other functions, is the "heart" of laser technology. După ani de cercetare, the Peking University team creatively put forward a new optical crystal theory, and applied the light element material bor nitrură to prepare an ultra-subțire, high-efficiency optical crystal "corner rombic bor nitrură" (TBN for short) for the first time, which lays the the teoretical and material foundation for a new generation of laser technology. The results have been published in Physical Review Letters, A conducere fizică jurnal.
Academician of the Chinese Academy of Sciences and professor at Peking University's School of Physics, Wang Engo, said in an exclusive interview with Xinhua News Agency that this achievement is not only an original breakthrough in China's theory of optical crystals, which opens up a new field of preparing optical crystals by using two-dimensional thin-film materials with light elements, but also prepares TBN with a thickness of only micrometers, which is the world's thinnest optical crystal known to date, and its energy efficiency is 100 to 10,000 million times higher compared to that of a conventional crystal with the same thickness. Its energy efficiency is 100 to 10,000 times higher than that of conventional crystals of the same thickness.
Faza este a metrică care descrie the change in the waveform of a light wave. When the light waves in a crystal are phase-matched and in step, a laser with ideal efficiency and power can be output. In recent years, due to the limitations of traditional teoretic models and material systems, existing crystals have been difficult of meet the development needs of miniaturization, high integration and functionalization of lasers.
Către acest sfârșit, Profesor Liu Kaihui, Director al Institut de Condensat Materie Fizică și Materiale Fizică at the School of Physics, Peking University, and Dejecy Director of the Light Element Quantum Materials Cross-Platform at the Huairou Comprehensive National Science Center in Beijing, together with Wang Engo, led a team of researchers to propose a new "corner phase matching theory". The team found that by stacking bor nitrură materiale like "building blocks" and then "rotating" them to a special angle, the phases of different light waves can be converged to form a high-efficiency optical crystal, TBN.
"If the laser generated in the crystal is regarded as a team, the use of 'cornering' method can make all the members of the direction and pace of highly coordinate, you can enhance the energy conversion efficiency of the laser." Liu Kaihui said the TBN is only 1 to 10 microns thick, equivalent to one-thirtieth of the thick of an ordinary A4 paper, while the thick of current optical cristale este în mare parte pe ordinul de milimetri sau par centimetri.
"Optical cristale are the cornerstone of laser technology development." With its ultra-thin size, excelent integrability and brand-new functions, TBN is expected to realize new application breakthroughs in the future in fields such as quantum light sources, photonic chips and artificial intelligence, Wang Engo said.