A new world record in laser monochromaticity. German and American scientists jointly created a laser with a spectral line width of only 10 milliseconds (1 millihertz is 0.001 hertz), setting a new world record for laser pointer monochromaticity. According to a press release issued by the German Federal Institute of Physics and Technology, this is by far the laser closest to ideal monochromaticity. Using it to measure the atomic frequency can make the photon clock more accurate, and it also helps in spectroscopy and radio astronomy research.
The line width of ordinary lasers is usually several thousand hertz to several million hertz, which is not suitable for experiments with particularly high accuracy requirements. Scientists from the German Federal Institute of Physics and Technology and the United States Joint Institute for Experimental Astrophysics created two laser beams with a wavelength of about 1.5 microns, and the comparison confirmed that the line width was 10 millihertz. The two lasers are very stable, all the light waves that make up the laser are very similar, and the oscillation pace is highly consistent. They can maintain synchronization for at least 11 seconds with 194 trillion oscillations per second. During this time, the laser can travel 3.3 million kilometers, which is equivalent to nearly 10 times the distance from the earth to the moon.
On-chip laser diode with the lowest narrow linewidth. Researchers from the MESA + Nanotechnology and Chip Manufacturing Company at the University of Twente in the Netherlands said that they have developed an on-chip laser diode with the lowest narrow linewidth in the world. The tunable indium phosphide / silicon nitride hybrid photonic integrated laser has an inherent laser linewidth of 290 Hz and a spectral coverage of 81 nm. The team leader of the University of Twente pointed out that the laser is ten times more coherent than any other on-chip laser (narrow linewidth is ten times lower).
The R & D personnel developed a photonic integrated red laser pointer with a narrow linewidth of 290 Hz. The researchers said that the new laser will bring a wide range of applications, including mobile antennas on mobile phone masts that control 5G mobile Internet, faster fiber-optic data transmission, and more accurate GPS systems and for monitoring buildings and Sensors for bridge structural integrity, etc.
Integrated 100kHz narrow linewidth laser light source. Recently, the subject of information technology in the National 863 Plan undertaken by Fujian Fuzhou “integrated 100kHz narrow-linewidth laser light source” passed the acceptance of experts organized by the High-Tech Research and Development Center of the Ministry of Science and Technology.