清华大学副教授丁世谦团队成功研制出钍-229核光钟并率先实现运行，相关成果论文于北京时间10月7日晚在《自然》期刊发表1。
团队自主研制了148纳米连续波真空紫外激光1，与合作团队共同研制了掺钍-229氟化钙晶体1。在仅有的1.4微克钍-229的条件下，团队成功生长出毫米尺度的高质量掺钍氟化钙晶体1，建立了从光源、晶体、光谱到闭环运行的完整技术体系1。
丁世谦表示，核光钟有望成为继原子微波钟和原子光钟之后的新一代时间频率标准1。丁世谦指出，固态核光钟具有潜在的小型化和工程化优势，有望为卫星导航、深空探测和国防安全等场景提供高精度时间频率技术1。
A research team led by Associate Professor Ding Shiqian at Tsinghua University has successfully developed and operated a thorium-229 nuclear optical clock, marking a significant advance in quantum precision measurement technology.1 The findings were published in the journal Nature on the evening of October 7 Beijing time.1
The team independently developed a 148-nanometer continuous-wave vacuum ultraviolet laser, the first of its kind internationally.1 In collaboration with partner institutions, they engineered thorium-229-doped calcium fluoride crystals, utilizing only 1.4 micrograms of available thorium-229 to successfully grow millimeter-scale high-quality crystals.1 The researchers established a complete technological system spanning from light sources and crystals to spectroscopy and closed-loop operation.1
According to Ding Shiqian, the nuclear optical clock is poised to become the next-generation time and frequency standard, following atomic microwave clocks and atomic optical clocks.1 The solid-state nuclear optical clock possesses potential advantages in miniaturization and engineering practicality, positioning it to provide high-precision timekeeping and frequency technology for applications in satellite navigation, deep space exploration, and national defense.1
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