Numerical simulations of stimulated Raman scattering in LIL transport section with Miró propagation code and comparison with ENOLIT diagnostic results

Bordenave, E.; Chies, T.

doi:10.1051/jp4:2006133132

Cited by 9 publications

(7 citation statements)

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“…[1−9] For the SG-III facility in the Laser Fusion Research Center, at the China Academy of Engineering Physics (CAEP), the propagation length 𝐿 between the output of the main amplifier and the frequency conversion system is 87 m and the mean intensity 𝐼 is around 2 GW/cm 2 , which induces an 𝐼𝐿 of 17.4 TW/cm. This figure goes far beyond the threshold reported before [1,2,5,6] describing the limit when the SRRS induces negative effects. In-depth investigation of the SRRS effect and suppression measurements is necessary.…”

mentioning

confidence: 49%

“…Both the theoretical predictions and experimental results indicate that the beam line of the SG-III laser system will generate significant levels of stimulated rotational Raman scattering over its expectant operating conditions. The main scheme adopted by active ICF laser drivers including LMJ, [5] NIF, [7,8] etc. is placing part of the beam path in inert gas atmosphere in order to reduce the effective interaction distance between the high intensity laser pulse and nitrogen molecules.…”

Section: -2mentioning

confidence: 99%

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Experimental Observation of Near-Field Deterioration Induced by Stimulated Rotational Raman Scattering in Long Air Paths

Wang¹,

Zhang²,

Han³

et al. 2011

Chinese Phys. Lett.

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We report the experimental investigation of a stimulated rotational Raman scattering effect in long air paths on SG-III TIL, with a 1053 nm, 20-cm-diameter, linearly polarized, 3 ns flat-topped laser pulse. An intense speckle pattern of near field with thickly dotted hot spots is observed at the end of propagation with an intensity-length product above 17 TW/cm. The Stokes developing from the scattering of the laser beam by quantum fluctuations is characterized by a combination of high spatial frequency components. The observed speckle pattern with smalldiameter hot spots results from the combination of the nonlinear Raman amplification and the linear diffraction propagation effect of the Stokes with a noise pattern arising from the spontaneous Raman scattering. A new promising suppression concept based on the special characteristic of the Stokes, called active and selective filtering of Stokes, is proposed.

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mentioning

confidence: 49%

Section: -2mentioning

confidence: 99%

Experimental Observation of Near-Field Deterioration Induced by Stimulated Rotational Raman Scattering in Long Air Paths

Wang¹,

Zhang²,

Han³

et al. 2011

Chinese Phys. Lett.

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“…Note, this is only achievable if the nominal sign of the right hand sides of the field equations is the same, unlike some presentations of this model. 9,21 The exact coupling constants are definitively derived quantum mechanically. 14 A more intuitive, albeit ad hoc derivation is found using a quasi-stationary, noise free assumption.…”

Section: Methodsmentioning

confidence: 99%

“…A simple energy conserving semi-implicit method is used to integrate the electric field, and a forward Euler method is used to integrate the material polarization wave, as has been demonstrated previously. 18,21…”

Section: Two-level Model Numerical Integrationmentioning

confidence: 99%

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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“…Therefore, the SRRS process suppression turns to be one of the key problems to be solved in the application and transmission of the high-energy and high-power laser. In 2004, Bordenave and Chies (2006) adopted the scheme that a part of transmission media of air is replaced with inert gas to increase the SRRS threshold distance (Kurnit et al, 1987;Wegner et al, 2004), however, the method is costly to build and maintain. Wang et al (2011) proposed to use transmitting Bragg volume gratings to inhibit SRRS by filtering out the Stokes light, but the tiny SRRS frequency shift and high-intensity laser pulse bring a great challenge to grating fabrication.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effects of smoothing by spectral dispersion on stimulated rotational Raman scattering

et al. 2013

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The effect of smoothing by spectral dispersion (SSD) on stimulated rotational Raman scattering (SRRS) in air has been investigated both numerically and theoretically. The suppression effect of SSD on SRRS process is verified and it is demonstrated and proposed that the suppression effect is attributed to two aspects: the decreasing of the laser fluence modulation degree and the reducing of Stokes gain coefficient caused by the temporal and spatial variation of the phase of the incident laser pulse. The simulation results show that the SRRS threshold distance can be lengthened by choosing appropriate SSD parameters.

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Numerical simulations of stimulated Raman scattering in LIL transport section with Miró propagation code and comparison with ENOLIT diagnostic results

Cited by 9 publications

References 0 publications

Experimental Observation of Near-Field Deterioration Induced by Stimulated Rotational Raman Scattering in Long Air Paths

Experimental Observation of Near-Field Deterioration Induced by Stimulated Rotational Raman Scattering in Long Air Paths

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

Numerical investigation of the effects of smoothing by spectral dispersion on stimulated rotational Raman scattering

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