二次谐波产生的光学倍频腔自锁定系统

二次谐波产生技术能有效扩展现有的激光波段,被广泛应用于原子分子物理、光物理、生物医学等多个领域。倍频腔的长期锁定是倍频技术中的一项关键技术,它直接关系到输出激光的功率稳定性和可靠性,目前的商用二次谐波产生激光器都会存在不同程度上的失锁状态。提出了一种基于积分扫描来实现连续激光倍频器自锁定的方案,能在没有人为调节的情况下连续工作,不需要额外的功率监测和扫描信号,失锁后可自动恢复锁定,最终实现了长期稳定的二次谐波产生激光输出。

Optical frequency doubling cavity automatic locking system for second harmonic generation

The second harmonic generation(SHG) technique can effectively extend the existing laser wavelengths range. It is widely applied in atomic, molecular physics and optical physics, biomedicine and other fields. Long-term stable locking of the optical frequency doubling cavity is a significant technology for the continuous wave frequency doubling technique, which is directly related to the laser output power stability and reliability. At present, the commercial SHG lasers have off-locking phenomena at different level. In this paper, an automatic locking scheme based on analog integral scanning technique was proposed. With this technique, the system could continuously work in the absence of artificial regulation, and no additional power monitoring and scanning signals were required. The system could automatically restore the locking state after it is out of locking. As a result, the long term and stable SHG laser output is obtained.