Optical Chaos in Saturated Nonlinear Media
Round 1
Reviewer 1 Report
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Comments for author File: 
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Reviewer 2 Report
In the paper of the evolution of Gaussian beam in saturated nonlinear media, it is found that the probability of optical rogue waves changes with the change of nonlinearity. This is very conclusion interesting for photonic industry.
The authors of this paper used Lyapunov exponent and the method of power spectrum to determine that the probability of rogue wave is chaotic with nonlinear evolution.
The light intensity distribution on the exit surface of nonlinear medium can be characterized by scintillation index, and the change of rogue wave corresponds to the evolution of scintillation index.
The Rouge wave probability shows a complex trend with the evolution of nonlinearity.
The authors are invited to add more experiments.
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Reviewer 3 Report
I would like to see Figure 1. c completely. The middle part is just wiped out. It looks so that you want to hide something. If the signal is meaningless because it's saturated, it has to be written in the text or in the figure caption.
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Reviewer 4 Report
Despite the scientific studies of rogue waves nowadays become an area of broad interest to researchers, both the physics of generation and the potential of predicting the risk of their appearance are open questions.
The authors of the submitted manuscript analyzed fluence patterns in noisy laser beam-driven saturable nonlinear media. In conclusion, they claim that rogue wave occurrence in the intensity distribution of the exit surface results from filamentation due to modulation instability.
1. In my opinion, although the precise underlying physical mechanisms leading to rogue wave formation in optics are still under debate, authors should discuss the generally accepted point, that mergers between optical filaments (and not modulation instability) were identified as a possible microscopic driver mechanism play a decisive role in optics. (see e.g. S.Birkholz at all., "Spatiotemporal Rogue Events in Optical Multiple Filamentation").
Additionally, I would note a very recent paper (Gemmrich, J., Cicon, L. Generation mechanism and prediction of an observed extreme rogue wave. Sci Rep 12, 1718 (2022)). Here random superposition of steep waves was demonstrated as a cause of the oceanic rogue waves occurrence.
Consequently, predictions based on modulational instability become questionable.
2. In their work, the authors examine the dependence of the results on the nonlinearity of the medium. I think the Gaussian beam intensity dependences should be interesting and could at least be mentioned.
3. Authors should carefully revise the text and correct spelling inaccuracies. There are many of them, here I will present only one sentence with four errors (lines 63-65): The rouge wave probability under applied voltage is represented by P.Through sets of experimental data we perform rouge wave statistics on the exit surface at each voltage[see Fig. 4].
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Reviewer 5 Report
This article needs a very careful revision by the authors.
1.- In the introduction it is mentioned the GrossPitaevskyi equation however when mentioning the unstable output of lasers, I would suggest to mention the Lorenz-Haken equations as well.
2.-I suggest to expand when mentioning that multiple solition colission may generate rouge waves. Under what conditions? Always?
3.- Some references are missing, e.g. Line 17 (It has been proved...), Line 19 (Another soliton colission discovered...)
4.- References supporting Lines 28-30 (Since the probability of rogue waves generated by filament collision is irregular with the evolution of nonlinearity, this has attracted our attention.)
5.- Line 36 It is mentioned that the SBS crystal has a length of 10 mm (propagation coordinate z). However in Figure 1 the voltage looks perpendicular to the optical axis.
6.- Look at Figure 2 c) and d). You are assuming radial symmetry.
7.- Fig.4 is not clear. How exactly did you get the probability values?
8.- Fig. 5 also requiere a more careful explanation.
9.- Line 66 (We used scintillation index to describe the intensity distribution) Please provide a careful explanation.
10.- Line 77-78. (...which is 78 similar to chaos) What exactly do you mean by "similar"?
11.- Line 90-91. T=3, m= 4. How? Why?
12.- Line 126. (By adding a noise seed to the incident light to simulate the perturbation in the incident 126 light,...). What is your justification to do this?
13.- Line 137. Fig??
14.- Fig. 10 This figure is very important and deserves a careful explanation
15.- Lines 158-160 (... is found that the scintillation index and the rogue wave probability are consistent with 158 the trend of nonlinear evolution.) This is a key conclusion and should be better justified.
Author Response
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Round 2
Reviewer 1 Report
The authors have carried out most of the comments and the article is almost ready to be published.
Can you please confirm:
1. In fig 7, 8, it is Volts and not mVolts?
If yes, please write Voltage [ Volts ]
2. Eq. 1, please use '\left|' and '\right|' not '\abs'. I have attached a screenshot of an example.
3. References 8 and 9 are the same.
Reference 9 should be
Rozenman, Georgi Gary, Lev Shemer, and Ady Arie. "Observation of
accelerating solitary wavepackets." Physical Review E 101.5 (2020): 050201.
Author Response
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Reviewer 5 Report
I recommend this article to be accepted in present form
