Stray Light Analysis and Suppression of Taiji Telescope for Space Gravitational Wave Detection Based on Phase Noise Requirement

Round 1

Reviewer 1 Report

This manuscript analyzes the stray light of Taiji telescope, finds out the main source of the stray light and showed that the stray light level would not change significantly during the service period of the Taiji Telescope. The results are important for the Taiji project and can be published after some minor corrections.

1, the English should be improved, for example, in the line 29 of page 1, 'three gravitational detectors ...' should be corrected, because usually we think that Taiji is a gravitation wave detector though it is formed three laser interference links.

2, the resolution of Figure 3 should be improved.

3, The authors should check the format of equations, for example 'sin', equation (15) ...

 

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Reviewer’s Comments:

The manuscript “Stray Light Analysis of Taiji Telescope for Space Gravitational Wave Detection” is a very interesting work. In this work, the telescope is the core device for space gravitational wave detection. It is responsible for receiving signal light and emitting outgoing light simultaneously. When the high-energy outgoing laser passes through the telescope, it would produce stray light, which would interfere with the phase measurement and generate phase noise. Therefore, it is necessary to analyze and suppress the stray light of the telescope. In this paper, the requirement of point source transmittance (PST) of the Taiji telescope is obtained through theoretical derivation which is less than 4×10-10. Through a complete analysis of stray light, we determined that the M4 was the largest source of stray light, which accounted for 67.22%. We also determined the most lenient requirements for surface roughness σλ, and found that when σλ of the M1, M2, M3, and M4 were 20 Å, 4 Å, 1 Å, 1 Å respectively, the PST was 3.89×10-10, which met the PST requirement. While I believe this topic is of great interest to our readers, I think it needs major revision before it is ready for publication. So, I recommend this manuscript for publication with major revisions.

1. In this manuscript, the authors did not explain the importance of the Space Gravitational Wave in the introduction part. The authors should explain the importance of Space Gravitational Wave.

2) Title: The title of the manuscript is not impressive. It should be modified or rewritten it.

3) Correct the following statement “Next, we calculated the effect of particulate contamination on the PST and determined that a cleanliness class of better than 300 was required. Finally, we evaluated the changes in the PST caused by the damage of micrometeoroids, and the analysis results showed that the stray light level would not change significantly during the service period of the Taiji Telescope”.

4) Keywords: The Space Gravitational Wave is missing in the keywords. So, modify the keywords.

5) Introduction part is not impressive. The references cited are very old. So, Improve it with some latest literature like 10.3390/molecules27217368, 10.3390/pr10081455

6) The authors should explain the following statement with recent references, “Since the distribution of particles and the undulation of the optical surface are random, it is quite challenging to determine the BSDF”.

7) Add space between magnitude and unit. For example, in synthesis “21.96g” should be 21.96 g. Make the corrections throughout the manuscript regarding values and units.

8) The author should provide reason about this statement “It is effortless to clean particles with a diameter greater than 200 µm, so we assume that the particle diameter is between 1 um and 200 µm”.

9. Comparison of the present results with other similar findings in the literature should be discussed in more detail. This is necessary in order to place this work together with other work in the field and to give more credibility to the present results.

10) Conclusion part is very long. Make it brief and improve by adding the results of your studies.

 

11) There are many grammatic mistakes. Improve the English grammar of the manuscript.

Author Response

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Author Response File: Author Response.docx

Reviewer 3 Report

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Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf