Theoretical improvement and experimental research on Raman coupled equations

Wang, Xiaobin; Kang, Wenyun; Xie, Ping; Zong, Nan

doi:10.1117/1.oe.56.8.086109

Cited by 2 publications

(3 citation statements)

References 27 publications

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“…This model has been treated extensively, in various forms and derived using both classical and quantum mechanical formalisms. [15][16][17] The majority of numerical work concerning SRRS has used this model, or it's intensity based counterpart. However, given a particular setup, this model can be further reduced for simpler analyses.…”

Section: Methodsmentioning

confidence: 99%

“…20 Therein, and for generalized models, we implicitly ignore far off-axis Raman generation which adds another level of complexity to the model, something which can be of relevance for picosecond pumped Raman lasers. 16,17 First, consider the number of photons in the system…”

Section: Methodsmentioning

confidence: 99%

“…The effect of sequentially generated higher order light has been studied in depth from a quasi-stationary, dimensionless, or noise free setup. 11,12,16,[24][25][26] We describe here a model for multi-harmonic Stokes light generated from noise.…”

Section: Multi-phonon Model (Mpm)mentioning

confidence: 99%

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Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

McLaren

McCandless

Schrauth

et al. 2023

High Power Lasers for Fusion Research VII

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Stimulated rotational Raman scattering in air is a powerful parasitic process that degrades high intensity pulses propagated over significant distances. Through this inelastic scattering process, laser photons are converted to higher (Anti-Stokes) or lower (Stokes) energies, according to rotational mode transitions in the nitrogen and oxygen molecules. The full wave-mixing problem involves numerous frequencies including both Stokes and Anti-Stokes processes, multiple rotational line transitions, and multi-harmonic generation, with each generated field acting as a seed for subsequent scattering processes. Multiple numerical models of these processes were integrated into Lawrence Livermore National Laboratory's in-house nonlinear optical chain propagation software, Virtual Beamline++. The complex spatio-temporal dynamics of single, and multi-frequency stimulated rotational Raman scattering are highlighted and discussed. General limitations of steady-state, dynamic two-level, multi-harmonic, and multi-rotational models are demonstrated and compared.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

McLaren

McCandless

Schrauth

et al. 2023

High Power Lasers for Fusion Research VII

View full text Add to dashboard Cite

show abstract

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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Theoretical improvement and experimental research on Raman coupled equations

Cited by 2 publications

References 27 publications

Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

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

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