Review of nonlinear effects under TW-power PS pulses amplification in GARPUN-MTW Ti:sapphire-KrF laser facility

Зворыкин, В. Д.; Ustinovskii, N. N.

doi:10.1063/5.0004130

Cited by 8 publications

(6 citation statements)

References 67 publications

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“…For this reason UV beam exhibits self-defocusing of filaments and intensity homogenization while propagating in Xe. At Xe pressure of 0.1 atm the filament diameter at the end of the cell increases by a factor 3.6 while its intensity falls down by an order of magnitude [37].…”

Section: Generation Of Narrowly Directed Ir Radiation In the Near-resonant Interaction Of Uv Filaments With Xenonmentioning

confidence: 94%

Monochromatic Conical IR Emission from Decaying KrF Laser Filaments in Xenon as Coherent Stimulated Four-Wave Mixing Process

Smetanin

Ustinovskii

et al. 2021

Photonics

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We develop theoretical background for the new nonlinear optical phenomenon of narrowly directed monochromatic IR conical emission which has been recently observed when 248-nm UV filaments propagate in xenon (V. D. Zvorykin, et al., Laser Phys. Lett. 13, 125404 (2016)). We treat it as coherent stimulated four-wave mixing process in which two pump KrF laser photons are converted into the coupled pair of resonance IR(828 nm) and VUV (147 nm) photons through 5p5(2P3/2)6p[1/2]0→5p5(2P3/2)6s[3/2]1o and 5p5(2P3/2)6s[3/2]1o→1S0 transitions. We explore the coherent interaction regime which proceeds at a time scale shorter than transverse relaxation time T2. The momentum and energy conservation laws determine the characteristic angle of conical emission. We find that the threshold of this coherent process is determined by the KrF laser pump pulse area.

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Section: Generation Of Narrowly Directed Ir Radiation In the Near-resonant Interaction Of Uv Filaments With Xenonmentioning

confidence: 94%

Monochromatic Conical IR Emission from Decaying KrF Laser Filaments in Xenon as Coherent Stimulated Four-Wave Mixing Process

Smetanin

Ustinovskii

et al. 2021

Photonics

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“…The radiation distribution in a focal plane was measured by Spiricon SP620U profiler (Ophir Photonics), while K8 glass plate was used to convert UV laser light into green fluorescence [10]. The focal distribution had a Gaussian-like symmetric central part and broad low-intensity wings, originated from a temporal evolution of laser light in the unstable resonator cavity of the laser [22].…”

Section: A Layout Of Experimentsmentioning

confidence: 99%

“…Unfortunately, a local growth of energy density in evolving filaments significantly reduced the amplifier gain while 3-photon absorption in CaF2 windows (material of the choice) produced window degradation [9]. Also, the filamentation of powerful UV pulses in atmospheric air strongly distorted the laser beam distribution [10].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Scattering of the 248-nm Wavelength Light in High-Pressure SF6 and CH4 Gases for a Temporal Compression of 20-Ns KrF Laser Pulse

Zvorykin,

Metreveli,

Smetanin

et al. 2023

Preprint

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Nonlinear compression of narrow-band (Δ ≈ 0.2 cm-1) 20 ns KrF laser pulses in SF6 at 10 atm and CH4 at 50 atm pressure was studied. Both SBS and SRS optically phase conjugated backward reflected radiation was registered with energy reflectivity 10−14% in SF6 and CH4. In SF6 SBS pulses gradually shortened from 10 ns to 2−3 ns with pumping decrease to the SBS threshold ~ 10 mJ, while the SRS pulse had the shortest length of 30−60 ps for the maximal pumping of 120 mJ and broadened near the SRS threshold of ~30 mJ. For the SRS pulse energy ~ 2 mJ peak power 5×107 W was tenfold higher than the pump power. The theoretical model predicted a soliton-like SRS pulse compression to a temporal length of the order of vibrational relaxation time. There was no pulse compression of backward SBS and SRS radiation in CH4, while in the forward direction SRS pulses shortened to 3−4 ns at reduced pumping.

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“…Our previous experience with GARPUN, a hybrid Ti:Sapphire/KrF laser facility [ 49 ], revealed the benefits of such combined amplification and the drawbacks when operating with a rather high peak power ~1 TW in subpicocecond pulses [ 50 ]. For these goals, a more promising method seems to include the nonlinear shortening of typical 20 ns pulses of a discharge-pumped KrF laser by Stimulated Brillouin scattering (SBS) or Stimulated Raman scattering (SRS).…”

Section: Application Of Capillary Channels For Nonlinear Compression ...mentioning

confidence: 99%

A New Insight into High-Aspect-Ratio Channel Drilling in Translucent Dielectrics with a KrF Laser for Waveguide Applications

et al. 2022

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A new insight into capillary channel formation with a high aspect ratio in the translucent matter by nanosecond UV laser pulses is discussed based on our experiments on KrF laser multi-pulse drilling of polymethyl methacrylate and K8 silica glass. The proposed mechanism includes self-consistent laser beam filamentation along a small UV light penetration depth caused by a local refraction index increase due to material densification by both UV and ablation pressure, followed by filamentation-assisted ablation. A similar mechanism was shown to be realized in highly transparent media, i.e., KU-1 glass with a multiphoton absorption switched on instead of linear absorption. Waveguide laser beam propagation in long capillary channels was considered for direct electron acceleration by high-power laser pulses and nonlinear compression of excimer laser pulses into the picosecond range.

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Review of nonlinear effects under TW-power PS pulses amplification in GARPUN-MTW Ti:sapphire-KrF laser facility

Cited by 8 publications

References 67 publications

Monochromatic Conical IR Emission from Decaying KrF Laser Filaments in Xenon as Coherent Stimulated Four-Wave Mixing Process

Monochromatic Conical IR Emission from Decaying KrF Laser Filaments in Xenon as Coherent Stimulated Four-Wave Mixing Process

Nonlinear Scattering of the 248-nm Wavelength Light in High-Pressure SF6 and CH4 Gases for a Temporal Compression of 20-Ns KrF Laser Pulse

A New Insight into High-Aspect-Ratio Channel Drilling in Translucent Dielectrics with a KrF Laser for Waveguide Applications

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