The modified SRRS threshold criteria for high peak power laser pulses in long air-path transmission considering the near-field beam quality

Suppression of stimulated rotational Raman scattering (SRRS) is essential for the effective long-distance transmission of high-intensity laser pulses in air. In this work, a method for SRRS suppression is proposed based on the reconstruction of the initial laser pulse via subpulse stacking. The proposed method can suppress SRRS significantly and doubles the threshold distance when the initial laser pulse is stacked using 30 subpulses; this capability is attributed to the mutually perpendicular polarization directions of the adjacent subpulses. Additionally, the SRRS gain decreases even further if different phases are added to adjacent subpulses. This pulse stacking scheme also has potential for use in the suppression of other nonlinear effects, including transverse stimulated Raman scattering and transverse stimulated Brillouin scattering in large aperture optical components. There may be some difficulties in the implementation of such a scheme, and the energy losses that occur during the stacking process may even be greater than the losses due to SRRS, but we believe that the proposed method can serve as an inspiration for SRRS suppression scheme design.

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Stimulated rotational Raman scattering suppression by pulse stacking

Fan

Huang

Wang

et al. 2017

Applied Physics Letters

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Stimulated rotational Raman scattering of arbitrarily polarized broadband light

Lehmberg¹,

Wolford

Weaver

et al. 2020

Phys. Rev. A

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Spectral and far-field broadening due to stimulated rotational Raman scattering driven by the Nike krypton fluoride laser

et al. 2017

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Stimulated rotational Raman scattering (SRRS) in the ultraviolet region (λ=248 nm) has been observed at the Nike laser over extended propagation paths in air during high power operation. Although this phenomenon is not significant for standard operating configurations at Nike, broadening of the laser spectrum and far-field focal profiles has been observed once the intensity-path length product exceeds a threshold of approximately 1 TW/cm. This paper presents experimental results and a new theoretical evaluation of these effects. The observations suggest that significantly broader spectra can be achieved with modest degradation of the final focal distribution. These results point to a possible path for enhanced laser-target coupling with the reduction of laser-plasma instabilities due to broad laser bandwidth produced by the SRRS.

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The modified SRRS threshold criteria for high peak power laser pulses in long air-path transmission considering the near-field beam quality

Cited by 3 publications

References 13 publications

Stimulated rotational Raman scattering suppression by pulse stacking

Stimulated rotational Raman scattering suppression by pulse stacking

Stimulated rotational Raman scattering of arbitrarily polarized broadband light

Spectral and far-field broadening due to stimulated rotational Raman scattering driven by the Nike krypton fluoride laser

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