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Wavelength-multiplexed multi-mode EUV reflection ptychography based on automatic differentiation.
Light Sci Appl
August 2024
Imaging Physics Department, Applied Science Faculty, Delft University of Technology, Lorentzweg 1, Delft, 2628 CJ, The Netherlands.
Ptychographic extreme ultraviolet (EUV) diffractive imaging has emerged as a promising candidate for the next generationmetrology solutions in the semiconductor industry, as it can image wafer samples in reflection geometry at the nanoscale. This technique has surged attention recently, owing to the significant progress in high-harmonic generation (HHG) EUV sources and advancements in both hardware and software for computation. In this study, a novel algorithm is introduced and tested, which enables wavelength-multiplexed reconstruction that enhances the measurement throughput and introduces data diversity, allowing the accurate characterisation of sample structures.
View Article and Find Full Text PDFDynamic stabilization of ablative Rayleigh-Taylor instability in the presence of a temporally modulated laser pulse.
Phys Rev E
February 2024
Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Intense Laser Application Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, People's Republic of China.
This paper presents a numeric study of the dynamic stabilization of the ablative Rayleigh-Taylor instability (ARTI) in the presence of a temporally modulated laser pulse. The results show that the specially modulated laser produces a dynamically stabilized configuration near the ablation front. The physical features of the relevant laser-driven parameters in the unperturbed ablative flows have been analyzed to reveal the inherent stability mechanism underlying the dynamically stabilized configuration.
View Article and Find Full Text PDFRoom-temperature quantum optomechanics using an ultralow noise cavity.
Nature
February 2024
Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland.
Article Synopsis
- Researchers have observed mechanical motion influenced by light at room temperature, overcoming challenges like low mechanical quality factors and noise in solid-state systems.
- They developed a phononic-engineered membrane-in-the-middle system, achieving a 700-fold reduction in cavity frequency noise and a high quality factor of 180 million through soft-clamping techniques.
- This advancement allows for improved displacement sensing and the preparation of thermal states in the oscillator, pushing the boundaries of quantum control in macroscopic solid-state resonators.
Suppressing transverse mode instability through multimode excitation in a fiber amplifier.
Proc Natl Acad Sci U S A
May 2023
Department of Applied Physics, Yale University, New Haven, CT 06520.
Article Synopsis
- - High-power fiber laser amplifiers are expanding their applications in areas like industry and defense, but they face limitations due to transverse mode instability.
- - The study introduces a theoretical approach using highly multimode fiber amplifiers to effectively suppress thermo-optical nonlinearity and instability by leveraging the differences in characteristic length scales between temperature and optical intensity.
- - This method allows for higher TMI threshold power with many excited modes, producing high-quality beams that can be precisely manipulated for various applications, achieving high power, narrow spectral width, and excellent beam quality at the same time.
Emission dynamics of a multimode broadband interband semiconductor laser have been investigated experimentally and theoretically. Non-linear dynamics of a III-V semiconductor quantum well surface-emitting laser reveal the existence of a modulational instability, observed in the anomalous dispersion regime. An additional unstable region arises in the normal dispersion regime, owing to carrier dynamics, and has no analogy in systems with fast gain recovery.
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