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- Title
Features of the Development of the Small-Scale Self-Focusing in Superpower Femtosecond Lasers.
- Authors
Ginzburg, V. N.; Kochetkov, A. A.; Mironov, S. Yu.; Potemkin, A. K.; Silin, D. E.; Khazanov, E. A.
- Abstract
The physical reason for the difference between the small-scale self-focusing of nanosecond and femtosecond pulses is that the typical intensity of the latter is three orders of magnitude higher, i.e., TW/cm2 versus GW/cm2. This causes a significant shift of the growth-rate maximum of the Bespalov–Talanov instability to the region of high spatial frequencies. During free propagation, a decrease in the spectral density of noise and the self-filtering of the beam lead to the noise-density decrease in the region of the maximum growth rate and, therefore, slowing of the self-focusing development. This is shown to shift the restriction on using the transmissive optical elements in the superpower lasers towards high powers.
- Subjects
FEMTOSECOND lasers; OPTICAL elements; HIGH power lasers; FEMTOSECOND pulses; SPECTRAL energy distribution; MODULATIONAL instability; MAGNITUDE (Mathematics)
- Publication
Radiophysics & Quantum Electronics, 2020, Vol 62, Issue 12, p849
- ISSN
0033-8443
- Publication type
Article
- DOI
10.1007/s11141-020-10029-9