极差腔激光器

IF 6.6 1区 物理与天体物理 Q1 PHYSICS, APPLIED
Jia Zhang, Tiantian Shi, Jianxiang Miao, Deshui Yu, Jingbiao Chen
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引用次数: 0

摘要

由于激光频率对腔长波动的敏感性降低,坏腔激光在量子精密测量和频率计量方面具有广阔的应用前景。迄今为止,相关研究主要集中在传统腔体上,这些腔体的精细度足够高,共振线宽与腔体的自由光谱范围相比足够窄,但仍处于坏腔状态。然而,我们还从未在实验中获得过精细度接近极限 2 的腔体的激光输出。在这里,我们展示了一种极差腔激光器,分析了限制腔精细度的物理机制,并报告了精细度达到 2.01 的史上最差激光腔。光腔的反射率接近于零,只能提供微弱的光反馈。激光功率可高达几十微瓦,光谱线宽达到几千赫兹,比增益带宽窄一千倍以上。此外,空腔拉力测量显示,拉力系数为 0.0148,这是连续波激光器达到的最低值。我们的发现为未来新型超稳定激光器开辟了一个前所未有的创新视角,有可能引发未来在光学时钟、腔QED、连续波超辐射激光器以及量子多体物理探索方面的发现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

An extremely bad-cavity laser

An extremely bad-cavity laser

Lasing in the bad-cavity regime has promising applications in quantum precision measurement and frequency metrology due to the reduced sensitivity of the laser frequency to cavity-length fluctuations. Thus far, relevant studies have been mainly focused on conventional cavities whose finesse is high enough that the resonance linewidth is sufficiently narrow compared to the cavity’s free spectral range, though still in the bad-cavity regime. However, lasing output from the cavity whose finesse is close to the limit of 2 has never been experimentally accessed. Here, we demonstrate an extremely bad-cavity laser, analyze the physical mechanisms limiting cavity finesse, and report on the worst-ever laser cavity with finesse reaching 2.01. The optical cavity has a reflectance close to zero and only provides weak optical feedback. The laser power can be as high as tens of μW and the spectral linewidth reaches a few kHz, over one thousand times narrower than the gain bandwidth. In addition, the measurement of cavity pulling reveals a pulling coefficient of 0.0148, the lowest value ever achieved for a continuous-wave laser. Our findings open up an unprecedentedly innovative perspective for future new ultra-stable lasers, which could possibly trigger future discoveries in optical clocks, cavity QED, continuous-wave superradiant laser, and explorations of quantum many-body physics.

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来源期刊
npj Quantum Information
npj Quantum Information Computer Science-Computer Science (miscellaneous)
CiteScore
13.70
自引率
3.90%
发文量
130
审稿时长
29 weeks
期刊介绍: The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.
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