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商用的半导体激光器由于其长期漂移大,不能满足单离子光频标中离子的激光冷却和长时间探测的目的。因此,采用了传输腔稳频技术减小商用397nm半导体激光器的长期漂移。利用经过Pound-Drever-Hall(PDH)技术锁定的729nm超稳激光器作参考激光,采用扫描的法布里-珀罗(F-P)干涉仪作传输介质,实现了397nm半导体激光器的长稳锁定。稳频后397nm激光器在1h内的漂移小于1MHz,100s的Allan方差小于1×10-10。这些指标为下一步利用传输腔技术实现866nm激光的长稳锁定打下了基础,同时为优化单个钙离子的激光冷却和长时间精密测量提供了条件。
Commercial semiconductor lasers can not meet the purpose of laser cooling and long-time detection of ions in a single ion optical frequency standard because of their long-term drift. Therefore, the use of transmission cavity frequency stabilization technology to reduce the long-term commercial 397nm semiconductor laser drift. The long-term locking of the 397nm semiconductor laser is achieved using a scanning Fabry-Perot (F-P) interferometer as a reference laser using a 729nm Ultrastable laser locked by Pound-Drever-Hall (PDH) technology. After the frequency stabilization 397nm laser drift within 1h less than 1MHz, 100s Allan variance less than 1 × 10-10. These guidelines lay the groundwork for the next long-term lock-in of 866nm lasers with transmission cavity technology and provided the conditions for optimizing laser cooling and long-term precision measurements of individual calcium ions.