Periodical Ultra-Modulation of Broadened Laser Spectra in Dielectrics at Variable Ultrashort Laser Pulsewidths: Ultrafast Plasma, Plasmonic and Nanoscale Structural Effects

Round 1

Reviewer 1 Report (Previous Reviewer 1)

Comments and Suggestions for Authors

I accept this manuscript to be published as paper. My changes are added.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report (New Reviewer)

Comments and Suggestions for Authors

In this paper, optical transmittance spectra of ultrashort (0.3 - 12 ps) laser pulses at 515-nm and 1030-nm wavelengths and variable pulse energy were acquired in the pre- and filamentation regimes in bulk natural and synthetic diamonds to search for the first time in situ for spectral signatures of dynamic electron-hole plasma density modulation related to non-local laser-plasmonic interactions. The related bulk structural modifications produced in this laser irradiation regime were visualized in crystalline lithium niobate by atomic force microscopy cross-sectional analysis. I believe that publication of the manuscript may be considered only after the following issues have been resolved.

1.    Some numbers and units have connecting symbols, while others do not. The entire text needs to be unified.

2.    The author mentioned that the broadening and overmodulation damping of longer picosecond pulse widths are related to the thermal electron hole plasma mechanism established for laser pulse widths exceeding 2 ps. May I ask what is the criterion for the thermal electron hole plasma mechanism

3.    In order to highlight the advantages of this work, it is recommended that the author supplement a comparative table of related work.

4.    Regarding the plasmonic, some of the latest relevant literature authors need to mention, such as Diamond & Related Materials 140 (2023) 110481; Opto-Electron Adv 6, 220061 (2023); Materials Research Bulletin 170, 2024, 112572; Opto-Electron Adv 6, 220133 (2023).

5.    The English expression of the whole article needs to be further improved.

Comments on the Quality of English Language

Minor editing of English language required

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report (New Reviewer)

Comments and Suggestions for Authors

Comments for author File: Comments.pdf

Author Response

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Round 2

Reviewer 2 Report (New Reviewer)

Comments and Suggestions for Authors

Accept in present form.

This manuscript is a resubmission of an earlier submission. The following is a list of the peer review reports and author responses from that submission.

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

My suggestion is to make the introduction to the following articles more attractive to the reader.

1. Kudryashov, S.I., Danilov, P.A., Sdvizhenskii, P.A. et al. Transformations of the Spectrum of an Optical Phonon Excited in Raman Scattering in the Bulk of Diamond by Ultrashort Laser Pulses with a Variable Duration. Jetp Lett. 115, 251–255 (2022). https://doi.org/10.1134/S0021364022200012

 

2. Shuyi Liu et al. ,Nanoscale coherent phonon spectroscopy.Sci. Adv.8,eabq5682(2022).DOI:10.1126/sciadv.abq5682

 

3. Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

Behrokh Beiranvand, Alexander S. Sobolev and Anton V. Kudryashov

Eur. Phys. J. Appl. Phys., 92 2 (2020) 20502

DOI: https://doi.org/10.1051/epjap/2020200208

 

4. Tasolamprou, A.C., Skoulas, E., Perrakis, G. et al. Highly ordered laser imprinted plasmonic metasurfaces for polarization sensitive perfect absorption. Sci Rep 12, 19769 (2022). https://doi.org/10.1038/s41598-022-21647-w

 

5. Bai, S.; Hu, A.; Hu, Y.; Ma, Y.; Obata, K.; Sugioka, K. Plasmonic Superstructure Arrays Fabricated by Laser Near-Field Reduction for Wide-Range SERS Analysis of Fluorescent Materials. Nanomaterials 2022, 12, 970. https://doi.org/10.3390/nano12060970

Figure 1 is a general plan or your proposed structure? Please describe in the text

Can you compare the results of Figure 4. Transmittance spectra of 515-nm pulses at the different pulse energies and pulse-140

widths (a-d) for the synthetic diamond sample and Figure 2. Comparative transmittance spectra of 1030-nm pulses at the different pulse en- 112 ergies (50, 120 and 300 nJ) and pulsewidths (i-vi) for the synthetic (a) and natural (b) dia-113 mond samples, Give a brief description.

At the end of the discussion, please compare your work with previous works.

 

 

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

Kudryashov et al. report SPM broadening of laser spectra in transmission mode in natural and synthetic diamonds at two laser wavelength 515nm/1030nm, various pulse energies and pulse widths. Many transmission spectra after 2mm thick samples at various laser conditions are presented. The main flaw of the manuscript is that conclusions from the results are not convincing at all.

1. In Section 3.1, the authors claim "onset of visible filamentation occurs near 50nJ, while in the synthetic diamond it starts near 300nJ". How is the onset defined? I can not see this from Fig. 2. "Above the filamentation threshold, the number of Stokes and anti-Stokes sideband peaks monotonously increases, approaching, e.g. to 3 for the natural diamond versus 1 for the synthetic one at the 0.3-ps pulsewidth," This is not clear at all, I expect indication of these peaks with arrows in the Figure.

2. In Section 3.2, the authors use words like "braoder and stronger" and "spectral narrowing". In my opition, spectral features for the synthetic and natural diamonds in Fig. 2 are vague, not much different from each other. No conclusions can be drawn without qualtitative evaluations. The same applys to Fig. 4 and 5.

Author Response

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