数字激光按需梳理轨道角动量

IF 8.4 1区 物理与天体物理 Q1 OPTICS
Optica Pub Date : 2024-06-20 DOI:10.1364/optica.529425
Zhi-Cheng Ren, Li Fan, Zi-Mo Cheng, Zhi-Feng Liu, Yan-Chao Lou, Shuang-Yin Huang, Chao Chen, Yongnan Li, Chenghou Tu, Jianping Ding, Xi-Lin Wang, Hui-Tian Wang
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引用次数: 0

摘要

由相位结构涡旋光携带的光子轨道角动量(OAM)因其内在的无限维度,成为满足日益增长的大容量数据信息需求的重要而有前途的资源。大型 OAM 叠加很容易产生,但按需生成任意 OAM 光谱(如类似于频率梳的 OAM 组合)仍是一个挑战;特别是,按需 OAM 组合和任意多 OAM 模式尚未在源端实现。在这里,我们首次报告了一种多功能源端策略,通过控制相位自由度本身而不是任何代理,开发出灵活、动态可切换的按需数字 OAM 组合激光器。为此,我们提出了一个重要的设计理念,即嵌套环形腔配置是由一个嵌入稳定环形腔的退化腔和一对共轭的两倍对称多螺旋相位数字全息镜组成,这些数字全息镜装载在反射式纯相位空间光调制器上。在嵌套环形腔中,稳定环形腔和退化腔分别满足高空间相干性和支持任意横向模式的要求。位于互为对象平面和图像平面的成对共轭全息反射镜规避了不同 OAM 模式之间的竞争问题,并能轻松控制 OAM 组合中模式的数量和手性。我们的策略还具有普遍性,因为它能够对任意分布的 OAM 光谱进行编码。实现动态按需多 OAM 模式激光器是多 OAM 模式光源萌芽阶段的一项重要进展。我们的想法为新兴高维技术的发展提供了一个前景广阔的解决方案;未来,高维 OAM 模式的基本原理和应用及其他领域将有越来越多的机会。我们的策略不仅有助于新激光技术的发展,还为在光源处产生多 OAM 模式的线性和非线性提供了工具箱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On-demand orbital angular momentum comb from a digital laser
Photonic orbital angular momentum (OAM) carried by phase-structured vortex light is an important and promising resource for the ever-increasing demand towards high-capacity data information due to its intrinsic unlimited dimensionality. Large superpositions of OAM are easy to be produced, but on-demand generation of arbitrary OAM spectra such as an OAM comb similar to a frequency comb is still a challenge; especially, the on-demand OAM comb and arbitrary multi-OAM modes have not yet been realized at the source. Here we report a versatile at-source strategy for developing a flexibly and dynamically switchable on-demand digital OAM comb laser for the first time, to our knowledge, by controlling the phase degree of freedom itself rather than any proxy. For this aim, we present a crucial design idea that a nested ring cavity configuration is composed of a degenerate cavity embedded into a stable ring cavity and a pair of conjugate two-fold symmetric multi-spiral-phase digital holographic mirrors loaded onto reflective phase-only spatial light modulators. In the nested ring cavity, the stable ring cavity and the degenerate cavity meet the requirements of high spatial coherence and supporting any transverse mode, respectively. The paired conjugate holographic mirrors located in mutual object and image planes circumvent the competing issue among different OAM modes and control the number and chirality of modes in OAM combs with ease. Our strategy has also universality as it has the ability of encoding OAM spectra with arbitrary distribution. The realization of a dynamic on-demand multi-OAM-mode laser is an important progress in the infancy of multi-OAM-mode sources. Our idea provides a promising solution for development of emerging high-dimensional technologies; in the future, there will be increasing opportunities in the fundamentals and applications of high-dimensional OAM modes, and beyond. Our strategy not only contributes to the development of new laser technology, but also provides a toolbox for both linear and nonlinear generation of the multiple OAM modes at the source.
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来源期刊
Optica
Optica OPTICS-
CiteScore
19.70
自引率
2.90%
发文量
191
审稿时长
2 months
期刊介绍: Optica is an open access, online-only journal published monthly by Optica Publishing Group. It is dedicated to the rapid dissemination of high-impact peer-reviewed research in the field of optics and photonics. The journal provides a forum for theoretical or experimental, fundamental or applied research to be swiftly accessed by the international community. Optica is abstracted and indexed in Chemical Abstracts Service, Current Contents/Physical, Chemical & Earth Sciences, and Science Citation Index Expanded.
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