利用超快紫外光谱测量N2的光学放大和种群动态。

IF 3.3 2区物理与天体物理 Q2 OPTICS

Optics letters Pub Date : 2025-10-01 DOI:10.1364/OL.565942

Rostyslav Danylo, Guillaume Lambert, Mykyta Redkin, Aurélien Houard, Xiang Zhang, Shaofen Gao, Liang Xu, Yi Liu, Arnaud Couairon, Vladimir Tikhonchuk, André Mysyrowicz

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引用次数: 0

摘要

我们展示了一个非常强的激光增益在近紫外，在391nm，涉及一个和两个光子跃迁之间的初始和最终水平的跃迁。这为短波全光激光器的实现开辟了道路。放大介质为低密度的N2+，由波长较长的强激光源泵浦，即800 nm。用飞秒精度测量了气体对XUV高次谐波的吸收，显示了放大过程中相关电子能级的演变。我们展示了第三层与初始和最终层形成“V方案”的作用。

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Measurement of optical amplification and population dynamics using ultrafast XUV spectroscopy of N₂^.

We demonstrate a very strong laser gain in the near UV, at 391 nm, involving one- and two-photon transitions between initial and final levels of the transition. This opens the way to the realization of all-optical lasers at short wavelengths. The amplifying medium is N₂⁺ at low density, pumped by an intense laser source at a longer wavelength, i.e., 800 nm. It is probed by measuring with femtosecond precision the absorption of XUV high harmonics through the gas, displaying the evolution of the relevant electronic levels during the amplification process. We show the role of a third level forming a "V scheme" with the initial and final levels.

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来源期刊

Optics letters 物理-光学

CiteScore

6.60

自引率

8.30%

发文量

2275

审稿时长

1.7 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.