光泵磁力仪中垂直腔面发射激光器激光波长锁定
收稿日期: 2022-09-23
修回日期: 2022-12-11
录用日期: 2022-12-21
网络出版日期: 2024-04-30
基金资助
上海航天先进技术联合研究基金(USCAST2019-23);上海交通大学“深蓝计划”基金项目(SL2021ZD202)
Wavelength Locking of Vertical-Cavity Surface-Emitting Laser in Optically Pumped Magnetometer
Received date: 2022-09-23
Revised date: 2022-12-11
Accepted date: 2022-12-21
Online published: 2024-04-30
针对光泵磁力仪(OPM)对小型化、低功耗以及激光光源波长稳定性的要求,提出一套垂直腔面发射激光器激光波长锁定控制方案.所提基于多普勒吸收的光反馈波长锁定方案以 133Cs 原子D1线Fg = 4→Fe = 3超精细能级跃迁波长为参考波长,OPM的原子蒸汽气室同时作为波长锁定的工作气室,无需任何额外装置即可将激光波长锁定在该D1线跃迁波长.使用数字比例积分微分控制与模糊控制算法进行激光的温度控制,使温度波动在 ±0.005 ℃ 内;采用基于电流镜的激光电流驱动方案,使电流波动在±50 nA内,为激光波长锁定提供了良好的硬件基础.最后,在实验室环境下实现OPM长达2 h的稳定信号输出.
骆曼箬, 李绍良, 黄艺明, 张弛, 吴招才, 刘华 . 光泵磁力仪中垂直腔面发射激光器激光波长锁定[J]. 上海交通大学学报, 2024 , 58(4) : 438 -448 . DOI: 10.16183/j.cnki.jsjtu.2022.371
Aimed at the requirements of optically pumped magnetometer (OPM) for miniaturization, low power consumption and laser frequency stability, a wavelength locking control scheme for vertical-cavity surface-emitting laser is proposed. The proposed method of laser wavelength locking based on Doppler absorption optical feedback takes the wavelength of D1 line Fg = 4→Fe = 3 transition in 133Cs atom as the reference. The atom vapor cell in OPM is also used as the working cell for wavelength locking so that the laser wavelength can be locked on the corresponding wavelength of the D1 line transition without any additional setup. The digital proportional integral differential and fuzzy control algorithm is used for laser temperature control and the temperature fluctuation is within ±0.005 ℃. Laser current driving is realized based on current mirror and the current fluctuation is within ±50 nA, which provides a good hardware foundation for laser wavelength locking. Finally, a stable signal output of the OPM for up to two hours under laboratory conditions is realized.
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