Simple Hertz-Level Laser Offset Locking by Using a Dual-Bandwidth Digital Band-Pass Filter

IF 2.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2025-06-27 DOI:10.1109/LPT.2025.3583756

Che-Chung Chou;Cheng-Chieh Hsieh;Ko-Han Chen;Yi-Jun Xu;Wang-Yau Cheng;Tyson Lin;Sheng-Hua Lu

引用次数: 0

Abstract

This letter presents a simple and easy-to-use self-referenced frequency discriminator for laser frequency offset locking. The key component of the “self-referenced” frequency discriminator is a dual bandwidth band-pass filter which is composed of two digital band-pass filters, one having a broader bandwith to provide a large capture range and the other having a narrow bandwidth for tight frequency locking. The digital band-pass filters are based on the PyRPL IQ modules running on a Red Pitaya STEMlab board. All the parameters of the IQ modules can be easily set and adjusted in the PyRPL GUI. To demonstrate the proposed scheme, we offset locked an external cavity diode laser to an iodine-stabilized external cavity diode laser. Their beat note was narrowed down from 500 kHz of the free running to 4 Hz as offset locked. The minimum Allan deviation of the locked offset frequency is 2.4 Hz at 100-s averaging.

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利用双带宽数字带通滤波器实现简单的赫兹级激光偏置锁定

这封信提出了一个简单和易于使用的自参考鉴频器激光频率偏移锁定。“自参考”鉴频器的关键部件是双带宽带通滤波器，该滤波器由两个数字带通滤波器组成，其中一个具有较宽的带宽以提供较大的捕获范围，另一个具有较窄的带宽以实现紧密的频率锁定。数字带通滤波器基于运行在Red Pitaya STEMlab板上的PyRPL IQ模块。IQ模块的所有参数都可以在PyRPL GUI中轻松设置和调整。为了演示所提出的方案，我们将一个外腔二极管激光器偏移锁定到一个碘稳定的外腔二极管激光器。他们的节拍音符从500千赫的自由运行缩小到4赫兹作为偏移锁定。锁定偏置频率的最小Allan偏差在100-s平均时为2.4 Hz。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.