用于微型 NMR 共磁力计泵送的离轴自由曲面反射准直器

IF 4.6 2区 物理与天体物理 Q1 OPTICS Optics and Laser Technology Pub Date : 2024-11-14 DOI:10.1016/j.optlastec.2024.112115
Yan Xu , Zhen Chai , Jianli Li
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引用次数: 0

摘要

用于泵浦和探测的光路设计在小型化核磁共振(NMR)共磁仪中起着至关重要的作用,它限制了传感器的尺寸。用于扩大、准直和反射激光束的传统笨重光学系统阻碍了紧凑型设计的实现。本研究介绍了一种使用离轴自由曲面的光路设计,它将光束扩展、准直和反射合为一体。对于发散角为 15° 的垂直腔面发射激光器 (VCSEL),离轴准直光斑的直径为 2.3 毫米,发散角为 1.5 毫弧度,在 8.7 毫米的光路中,线偏振反射率超过 98%。整个反射准直器结构小于 0.5 立方厘米,大大简化了光路。该装置用于自旋极化电子和核子,证明了实现原子极化的设计的可行性和有效性,并满足了原子泵浦和探测的要求。这种方法有望得到广泛应用,并为陀螺仪和磁力计等紧凑型原子传感器的微型化引入了一种新方法。
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Off-axis freeform surface reflective collimator for pumping in miniaturized NMR co-magnetometers
The design of the optical paths for pumping and probing plays an essential role in miniaturized nuclear magnetic resonance (NMR) co-magnetometers by constraining sensor size limitations. Traditional bulky optical systems for expanding, collimating, and reflecting laser beams hinder the achievement of compact designs. This study introduces an optical path design using an off-axis freeform surface that combines beam expansion, collimation, and reflection into one. For a vertical cavity surface-emitting laser (VCSEL) with a divergence angle of 15°, the off-axis collimation spot has a diameter of 2.3 mm, a divergence angle of 1.5 milliradians, and a degree of linear polarization of reflection more than 98 % at an optical path of 8.7 mm. The overall reflective collimator structure is less than 0.5 cm3, simplifying the optical path significantly. The device is purposed for spin polarizing electrons and nucleons, demonstrating the feasibility and effectiveness of the design to achieve atomic polarization and meets the requirements for atomic pumping and probing. This approach holds promise for broad applications and introduces a novel method to miniaturize compact atomic sensors like gyroscopes and magnetometers.
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来源期刊
CiteScore
8.50
自引率
10.00%
发文量
1060
审稿时长
3.4 months
期刊介绍: Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems
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