CHINA-BEIJING-ULTRATHIN OPTICAL CRYSTAL-INVENTION (CN)

This photo taken on Dec. 15, 2023 shows a Twist Boron Nitride TBN crystal placed on a piece of fused silica in Peking University, Beijing, capital of China. A team of Chinese researchers used a novel theory to invent a new type of ultrathin optical crystal with high energy efficiency, laying the foundation for next-generation laser technology. The research findings were recently published in the journal Physical Review Letters. TO GO WITH "China Focus: Chinese scientists invent ultrathin optical crystal for next-generation laser tech" (Photo by Wei Mengjia/Xinhua via Getty Images)