A method for highly efficient fourth harmonic generation (FHG) retaining spatiotemporal intensity distribution of broadband chirped laser pulses is proposed. It is based on the use of pulses with linear frequency chirps of equal absolute magnitudes and opposite signs at the oo-e type noncollinear second harmonic generation. Fourth harmonic generation can by obtained by the classical method, since the second harmonic pulse is narrowband and spectrally limited. A possibility to retain the three-dimensional (3D) structure of the field at FHG with a conversion efficiency ∼60 is demonstrated by the numerical simulation of 3D pulses with a quasi-ellipsoidal intensity distribution.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/AO.422601 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Different p-block elements induce C[111] octahedral distortion in titanium to generate an intense nonlinear effect.
Chem Sci
January 2025
Guangxi Key Laboratory of Electrochemical Energy Materials, School of Chemistry and Chemical Engineering, Guangxi University Nanning Guangxi 530004 China
Acentric crystalline materials are the cornerstone of numerous cutting-edge technologies and have been highly sought-after, but they are difficult to construct controllably. Herein, by introducing a new p-block element to break the symmetrical environment of the d transition metal in the centric matrix TiTeO, a novel acentric tellurite sulfate, namely Ti(TeO)(SO), was successfully constructed. In its structure, two types of p-block element-centered oxo-anionic groups, [TeO] and [SO], endow [TiO] with an out-of-center distortion along the local C[111] direction, which is rare in titanium oxides containing a lone-pair cation.
View Article and Find Full Text PDFInformatics strategies for early detection and risk mitigation in pancreatic cancer patients.
Neoplasia
January 2025
Department of Cancer Prevention, Zhejiang Cancer Hospital, Hangzhou 310022, China; Hangzhou Institute of Medicine (HIM), Chinese Academy of Sciences, Hangzhou, 310018, China. Electronic address:
This review provides a comprehensive overview of the current landscape in pancreatic cancer (PC) screening, diagnosis, and early detection. This emphasizes the need for targeted screening in high-risk groups, particularly those with familial predispositions and genetic mutations, such as BRCA1, BRCA2, and PALB2. This review highlights the sporadic nature of most PC cases and significant risk factors, including smoking, alcohol consumption, obesity, and diabetes.
View Article and Find Full Text PDFEffective bulk and mass densities of randomly distributed coated cylinders in fluid.
J Acoust Soc Am
January 2025
Laboratoire Ondes et Milieux Complexes LOMC UMR CNRS 6294, Université Le Havre Normandie, 75 rue Bellot, Le Havre, France.
Inhomogeneous media made of random configurations of coated circular cylinders are considered. The effective properties-wave number, mass density, bulk modulus-are discussed and illustrated. The effects of the volume fraction of the scatterers and surrounding fluid are also examined.
View Article and Find Full Text PDFExploring new horizons in mid-to-far infrared nonlinear optical crystals: the significant potential of trigonal pyramidal [TeS] functional units.
Chem Sci
January 2025
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences Fuzhou 350002 China
Traditional tetrahedral-based mid-to-far infrared (MFIR) nonlinear optical (NLO) crystals often face limitations due to the optical anisotropy constraints imposed by their highly symmetric structures. In contrast, the relatively rare trigonal pyramidal [TeS] functional unit characterized by its asymmetric structure and stereochemically active lone pair (SCALP), offers improved optical anisotropy, hyperpolarizability and a broader IR transparency range. Despite its potential, synthetic challenges have hindered the development of MFIR NLO crystals that incorporate this unit, with only one example reported to date.
View Article and Find Full Text PDFCuTCP: Custom Text Generation-based Class-aware Prompt Tuning for visual-language models.
Sci Rep
January 2025
Zhengzhou University of Light Industry, Zhengzhou, 450001, China.
Visual-language models (VLMs) excel in cross-modal reasoning by synthesizing visual and linguistic features. Recent VLMs use prompt learning for fine-tuning, allowing adaptation to various downstream tasks. TCP applies class-aware prompt tuning to improve VLMs generalization, yet its reliance on fixed text templates as prior knowledge can limit adaptability to fine-grained category distinctions.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!