We extend a recently demonstrated scheme [Optica4, 976 (2017)OPTIC82334-253610.1364/OPTICA.4.000976] to overcome the limit of conventional harmonic cutoff for different pulse durations, laser wavelengths, and gas targets. By tuning the truncation of long wavelength lasers, we show that the defocusing-assisted phase matching (DAPM) can be achieved in a tightly focused beam and highly ionized short gas cell, and can be used to effectively extend the harmonic cutoff energy and optimize its yield. An analysis of phase matching reveals that at longer wavelengths, greater cutoff extension to the water window region is achieved because of the larger harmonic intrinsic phase (proportional to the cube of laser wavelength), and because DAPM works at relatively higher laser intensities using a Ne target. This scheme provides a promising method for efficiently generating intense attosecond light sources in the extreme ultraviolet to x-rays.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.43.004433 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Energetic Materials Photolysis Footprint in High-Order Harmonic Generation.
J Phys Chem A
January 2025
School of Physics and Electronic Technology, Liaoning Normoal University, Dalian 116081, People's Republic of China.
Photolysis of energetic materials offers safer and more controllable advantages compared to traditional ignition methods. Tracking the group and electron dynamics during the photolysis of energetic materials is currently a hot and challenging topic. In this work, we used a time-dependent density functional theory (TDDFT) to study the high-order Harmonic generation (HHG) dynamics induced by strong laser interaction with an isolated CHNO molecule with varying C-N bond lengths.
View Article and Find Full Text PDFRational design of a series of non-centrosymmetric antiperovskite and double antiperovskite borate fluorides.
Chem Sci
December 2024
Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, College of Materials Science and Engineering, Tianjin University of Technology Tianjin 300384 China
Non-centrosymmetric (NCS) compounds can exhibit many symmetry-dependent functional properties, yet their rational structure design remains a great challenge. Herein, a strategy to introduce F-centered octahedra to construct a perovskite-type framework filled by π-conjugated [BO] dimers is proposed to obtain NCS compounds. The first examples of antiperovskite or double antiperovskite borate fluorides, [(M/Ba)Ca]F[BO] (M = K, Rb) and [CsBaCa]F[BO], have been successfully designed and synthesized.
View Article and Find Full Text PDFSupercontinuum generation in scintillator crystals.
Sci Rep
January 2025
Laser Research Center, Vilnius University, Saulėtekio Avenue 10, LT-10223, Vilnius, Lithuania.
We present a comparative experimental study of supercontinuum generation in undoped scintillator crystals: bismuth germanate (BGO), yttrium orthosilicate (YSO), lutetium oxyorthosilicate (LSO), lutetium yttrium oxyorthosilicate (LYSO) and gadolinium gallium garnet (GGG), pumped by 180 fs fundamental harmonic pulses of an amplified Yb:KGW laser. In addition to these materials, experiments in yttrium aluminium garnet (YAG), potassium gadolinium tungstate (KGW) and lithium tantalate (LT) were performed under identical experimental settings (focusing geometry and sample thickness), which served for straightforward comparison of supercontinuum generation performances. The threshold and optimal (that produces optimized red-shifted spectral extent) pump pulse energies for supercontinuum generation were evaluated from detailed measurements of spectral broadening dynamics.
View Article and Find Full Text PDFStructural modification of hydroxyborates by adjusting the number of shared oxygen atoms and hydroxyl groups for further performance enhancement.
Dalton Trans
December 2024
Research Center for Crystal Materials, State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions; Xinjiang Key Laboratory of Functional Crystal Materials; Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China.
In recent years, hydroxyborates with excellent properties have attracted much attention. Through dedicated efforts, three new hydroxyborates-KBO(OH), CsBO(OH), and CsBO(OH)-have been successfully synthesized in a closed system. The ultraviolet (UV) cut-off edges of both KBO(OH) and CsBO(OH) are below 200 nm, indicating their potential as candidates for deep-ultraviolet (DUV) materials.
View Article and Find Full Text PDFRational Design and Controlled Synthesis of High-Performance Inorganic Short-Wave UV Nonlinear Optical Materials.
Acc Chem Res
January 2025
College of Chemistry, Sichuan University, Chengdu 610065, P. R. China.
Article Synopsis
- The invention of lasers and inorganic second-order nonlinear optical (NLO) crystals has revolutionized technology by enabling unique frequency conversions, essential for various applications including information transmission and industrial uses.
- As the demand for shorter wavelengths and higher precision lasers increases, there is a pressing need for high-performance ultraviolet NLO materials, especially those with wavelengths less than 300 nm.
- Current methods of discovering these materials are often inefficient and based on trial-and-error; therefore, a three-step strategy is proposed for a more rational design, focusing on screening new functional groups, regulating crystal structures, and optimizing synthesis to meet stringent performance criteria.
Want 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!