Systematic analysis of correlated self-heterodyne method for intrinsic linewidth measurement

IF 3.7 2区工程技术 Q2 OPTICS

Optics and Lasers in Engineering Pub Date : 2025-08-26 DOI:10.1016/j.optlaseng.2025.109298

Kangjian Li , Zuoqiang Han , Jiarui Yi , Shuohong Jia , Li Kuang , Xiaolang Qiu , Jing Zhang , Chuanchuan Li , Yulian Cao , Xin Wei , Haiyang Yu , Jianguo Liu , Suo Wang

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引用次数: 0

Abstract

The correlated self-heterodyne method demonstrates significant advantages over conventional delayed self-heterodyne beating techniques for Hz-level intrinsic linewidth measurement. This innovative approach achieves superior performance through significantly shorter delay fiber lengths while maintaining exceptional versatility in measuring lasers at specialized wavelengths. In this work, we achieve intrinsic linewidth measurement deviations better than 2.5 % from sub-Hz to sub-kHz scales at a cost of $30k when compared to a $300k commercial linewidth analyzer. Furthermore, we systematically investigate and quantify the critical parameter boundaries, including the length of delay fiber and the sampling time of oscilloscope, governed by laser coherence properties. We also apply this method to specialized wavelength, such as 510 nm, which has a wide range of applications in quantum precision applications, and the intrinsic linewidth is 14.45 Hz. Our work establishes a robust framework for narrow-linewidth laser metrology, supporting advancements in precision optics and quantum technologies.

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相关自外差法测量本征线宽的系统分析

相对于传统的延迟自外差跳动技术，相关自外差法在赫兹级内禀线宽测量中具有显著的优势。这种创新的方法通过显着缩短延迟光纤长度实现了卓越的性能，同时在测量特定波长的激光器时保持了卓越的通用性。在这项工作中，与30万美元的商用线宽分析仪相比，我们以3万美元的成本实现了从亚赫兹到亚khz尺度的固有线宽测量偏差优于2.5%。此外，我们系统地研究和量化了激光相干特性对延迟光纤长度和示波器采样时间等关键参数边界的影响。我们还将该方法应用于特定波长，如510 nm，它在量子精密应用中有广泛的应用，其固有线宽为14.45 Hz。我们的工作为窄线宽激光测量建立了一个强大的框架，支持精密光学和量子技术的进步。

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来源期刊

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

期刊介绍： Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques