What is it about?
Raman scattering is an important physical phenomenon that enables wavelength conversion beyond what can be achieved with natural materials, nonlocal interactions between pulses for material examinations, and so on. However, it hasn't been well-studied. In particular, there is no a single theory that can cover various temporal regimes for ultrashort pulse applications. Here, we develop a theory to comprehensively study the Raman scattering, which also make connections of several physical phenomena across different regimes that were used to be treated as different phenomena. This theory constitutes a fundamental yet crucial cornerstone of Raman theory.
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Why is it important?
Gas-filled hollow-core fiber has attracted significant interest recently. It allows us to study novel physical phenomena in gases and generate high-energy pulses with novel features, such as new colors and shorter pulses. Since a lot of gases are Raman-active gases, especially the most prevalent nitrogen and oxygen in air, it is important to understand the effect of Raman scattering in gases, which broadens the and impact and applications of gas-filled hollow-core fiber to various gas species.
Perspectives
With such a unified theory on Raman scattering, air photonics (where complicated Raman scattering occurs in atmospheric air) with the simplest and cost-effective setup becomes possible. More novel physical phenomena, such as femtosecond wavelength conversion, polarization, and multimode effects for power scaling, can now be more-well-understood, which enables the advancement of pertinent research endeavors and holds the potential to extend the impact and practical applications beyond a limited range of gas species to real-world scenarios.
Yi-Hao Chen
Cornell University
Read the Original
This page is a summary of: Unified and vector theory of Raman scattering in gas-filled hollow-core fiber across temporal regimes, APL Photonics, March 2024, American Institute of Physics,
DOI: 10.1063/5.0189749.
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