Zhejiang University's "femtosecond laser" research results appeared in Science

The team conducts research.　Photo by Lu Shaoqing

Hangzhou, January 21 (Tong Xiaoyu, Ke Yineng, Wu Yalan) On January 21, the reporter learned from Zhejiang University (hereinafter referred to as "Zhejiang University") that the research results of the university's scientific research team "Femtosecond Laser" were listed on the international top academic journal "Science" on the same day. It is reported that the application direction of this achievement is three-dimensional, four-dimensional or even more dimensional optical storage, which will provide a new direction for a new generation of display and storage technology.

Lasers are called "the fastest knife", "the most accurate ruler" and "the brightest light". In the 1980s, scientists invented a peculiar laser, the femtosecond laser. It has the characteristics of ultrafast, super-strong and ultra-wide spectrum, but its interaction with matter is intricately complex, and even researchers cannot understand its "temper".

Recently, Professor Qiu Jianrong's team at the School of Optoelectronic Science and Engineering of Zhejiang University discovered the spatially selective micro-nano phase and ion exchange law induced by femtosecond laser, opened up a new technology for three-dimensional extreme manufacturing of femtosecond laser, and realized the band gap controllable three-dimensional semiconductor nanocrystal structure for the first time inside the colorless transparent glass material. This will provide a new direction for next-generation display and storage technologies.

Femtoseconds is a unit of measurement that measures the length of time. 1 femtosecond is one in 100 quadrillion of a second.

Qiu Jianrong's team has long been engaged in the research of femtosecond laser interaction with materials, and has made a series of highly original and important breakthroughs, which is in an international leading position. Based on a large number of experiments, the team has realized the composition of the adjustable perovskite nanocrystals inside the glass, and the structure and performance can be manipulated at will in "a moment".

The co-first authors of the paper are Sun Ke, a doctoral student in the School of Optoelectronic Science and Engineering of Zhejiang University, Tan Dezhi of Zhijiang Laboratory, and Fang Xinyuan, a researcher at the University of Shanghai for Science and Technology. The corresponding authors are Tan Dezhi and Qiu Jianrong.

According to reports, one of the application directions of the study is three-dimensional, four-dimensional or even more dimensional light storage.

"The existing storage devices are mostly magnetic storage, and there are some disadvantages, one is that the service life is only 3-5 years, and the other is that the energy consumption is relatively large and the heat dissipation requirements are high." Tan Dezhi said that optical storage not only has small power consumption, but also the capacity is expected to reach 1PB/optical disk, which will be a promising future development direction, and the expected storage life will reach millions of years. (End)