Raman Wavelength Conversion in Ionic Liquids

Kupfer, Rotem; Wang, Furong; Wishart, James F.; Babzien, M.; Polyanskiy, Mikhail; Pogorelsky, Igor; Rao, T.; Cultrera, L.; Vafaei-Najafabadi, Navid; Palmer, M.

doi:10.1103/physrevapplied.19.014052

Phys. Rev. Applied

2023

DOI: 10.1103/physrevapplied.19.014052

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Raman Wavelength Conversion in Ionic Liquids

Rotem Kupfer

Furong Wang

James F. Wishart

et al.

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2023

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Cited by 3 publications

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“…Researchers in the 1960s found that a liquid-filled cell, which had inadvertently been placed inside a laser's cavity, shifted the laser's wavelength. Now a team of scientists from Brookhaven National Laboratory (BNL), New York, show that synthetic, room-temperature liquid salts can also serve as effective laser-color-tuning media [1]. The finding could lead to a simple and energy-efficient tool for creating lasers with desired colors for medical and scientific applications.…”

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confidence: 99%

A Salt-Based Laser Color Converter

Berkowitz¹

2023

Physics

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Artificial salts that are liquid at room temperature can be used to efficiently tune the wavelength of a laser source.By Rachel Berkowitz H igh-energy, short-pulse laser sources exist only in a limited number of colors. Researchers in the 1960s found that a liquid-filled cell, which had inadvertently been placed inside a laser's cavity, shifted the laser's wavelength. Now a team of scientists from Brookhaven National Laboratory (BNL), New York, show that synthetic, room-temperature liquid salts can also serve as effective laser-color-tuning media [1]. The finding could lead to a simple and energy-efficient tool for creating lasers with desired colors for medical and scientific applications.

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confidence: 99%

A Salt-Based Laser Color Converter

Berkowitz¹

2023

Physics

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Four-dimensional dynamics of multirotational transition stimulated rotational Raman scattering in air

et al. 2023

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Stimulated rotational Raman scattering in air is a powerful parasitic process that degrades high intensity laser beams and pulses propagated over significant distances. Conversely, it is used beneficially in the context of Raman lasers. Through this inelastic scattering process, laser photons are converted to higher (anti-Stokes) or lower (Stokes) energies, according to rotational mode transitions in nitrogen and oxygen diatomic molecules. The full wave-mixing problem involves numerous frequencies, and it is consistently assumed that only one rotational mode contributes to the conversion process. We instead present a dynamic 4D multirotational model that is implemented in a parallelized manner within the Virtual Beamline++ optical modeling package allowing high-resolution 4D studies. We highlight the effect that spontaneous emission plays in large and small beam-width setups, even in the highly saturating regime. The weaker transition modes play a large role in the persistent dynamics and can lead to complex spatiotemporal coupling through nonlinear competition of the modes. We highlight how and why these weaker modes persist, how the size and shape of speckle patterns depends highly on the initial beam profile, and how weaker modes can transiently become stronger as a result of such competition.

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Cationic complex-enhanced C–H stimulated Raman scattering in naphthalene–benzene solution

Du¹,

Xue²,

Xu³

et al. 2023

Opt. Lett.

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Ring skeleton vibrations of aromatic series are dominant in Raman spectroscopy compared with the C–H stretching vibrations. When a laser-induced plasma (LIP) was generated in a mixed solution of naphthalene and benzene, an anomalous enhancement was observed in stimulated Raman scattering (SRS) of aromatic C–H stretching vibrations of naphthalene (3055 cm−1). However, SRS of C–H stretching vibrations of benzene at 3060 cm−1 disappeared. The LIP produced electrons and cations, and the transient production of ionized material contributed to the enhancement of SRS of C–H vibrations of naphthalene. Density functional theory calculations showed that the C–H Raman activity of the naphthalene molecules in (naphthalene–benzene)+ heterodimer was significantly enhanced compared with neutral naphthalene. In addition, SRS pulse durations were better compressed in pure benzene and naphthalene due to the self-focusing effect.

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Raman Wavelength Conversion in Ionic Liquids

Cited by 3 publications

References 59 publications

A Salt-Based Laser Color Converter

A Salt-Based Laser Color Converter

Four-dimensional dynamics of multirotational transition stimulated rotational Raman scattering in air

Cationic complex-enhanced C–H stimulated Raman scattering in naphthalene–benzene solution

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