Rydberg state excitation in molecules manipulated by bicircular two-color laser pulses

IF 20.6 1区 物理与天体物理 Q1 OPTICS Advanced Photonics Pub Date : 2023-01-01 DOI:10.1117/1.AP.5.1.016002
Wenbin Zhang, Yongzhe Ma, Chenxu Lu, Fei Chen, Shengzhe Pan, P. Lu, H. Ni, Jian Wu
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引用次数: 1

Abstract

Abstract. Multiphoton resonant excitation and frustrated tunneling ionization, manifesting the photonic and optical nature of the driving light via direct excitation and electron recapture, respectively, are complementary mechanisms to access Rydberg state excitation (RSE) of atoms and molecules in an intense laser field. However, clear identification and manipulation of their individual contributions in the light-induced RSE process remain experimentally challenging. Here, we bridge this gap by exploring the dissociative and nondissociative RSE of H2 molecules using bicircular two-color laser pulses. Depending on the relative field strength and polarization helicity of the two colors, the RSE probability can be boosted by more than one order of magnitude by exploiting the laser waveform-dependent field effect. The role of the photon effect is readily strengthened with increasing relative strength of the second-harmonic field of the two colors regardless of the polarization helicity. As compared to the nondissociative RSE forming H2  *  , the field effect in producing the dissociative RSE channel of   (  H  +    ,  H  *    )   is moderately suppressed, which is primarily accessed via a three-step sequential process separated by molecular bond stretching. Our work paves the way toward a comprehensive understanding of the interplay of the underlying field and photon effects in the strong-field RSE process, as well as facilitating the generation of Rydberg states optimized with tailored characteristics.
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双色激光脉冲操纵分子中的里德堡态激发
摘要多光子共振激发和受抑隧穿电离分别通过直接激发和电子再捕获表现出驱动光的光子和光学性质,是在强激光场中获得原子和分子的里德伯态激发(RSE)的互补机制。然而,明确识别和操纵它们在光诱导RSE过程中的个人贡献仍然是实验上的挑战。在这里,我们通过使用双圆形双色激光脉冲探索H2分子的离解和非离解RSE来弥合这一差距。根据两种颜色的相对场强和偏振螺旋度,通过利用激光波形相关的场效应,RSE概率可以提高一个数量级以上。光子效应的作用很容易随着两种颜色的二次谐波场的相对强度的增加而得到加强,而与偏振螺旋度无关。与形成H2的非社交RSE相比  *  , 产生的离解RSE通道的场效应  (  H  +    ,  H  *    )   被适度抑制,这主要是通过分子键拉伸分离的三步顺序过程来实现的。我们的工作为全面理解强场RSE过程中潜在场和光子效应的相互作用铺平了道路,并促进了用定制特性优化的里德伯态的产生。
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来源期刊
CiteScore
22.70
自引率
1.20%
发文量
49
审稿时长
18 weeks
期刊介绍: Advanced Photonics is a highly selective, open-access, international journal that publishes innovative research in all areas of optics and photonics, including fundamental and applied research. The journal publishes top-quality original papers, letters, and review articles, reflecting significant advances and breakthroughs in theoretical and experimental research and novel applications with considerable potential. The journal seeks high-quality, high-impact articles across the entire spectrum of optics, photonics, and related fields with specific emphasis on the following acceptance criteria: -New concepts in terms of fundamental research with great impact and significance -State-of-the-art technologies in terms of novel methods for important applications -Reviews of recent major advances and discoveries and state-of-the-art benchmarking. The journal also publishes news and commentaries highlighting scientific and technological discoveries, breakthroughs, and achievements in optics, photonics, and related fields.
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