A Brief Review on Nonlinear Photonic Crystals Induced by Direct Femtosecond Laser Writing
Round 1
Reviewer 1 Report
Comments for author File: 
Comments.pdf
Minor editing of English language required.
Author Response
I have revised my paper according to your suggestions. Thanks for your reviewing
Author Response File: Author Response.pdf
Reviewer 2 Report
A brief overview of direct femtosecond laser writing on second-order nonlinearity to achieve quasi-phase matching NPSs has been introduced in this review. After reading the manuscript, the review of direct femtosecond laser writing on the crystals and quasi-phase matching NPCs is thorough and complete. The manuscript could be published after addressing the following issues:
1. A relatively low-level error has occurred. In line 19, the technical word for “summer-frequency generation” should be “sum-frequency generation”. And the authors should pay attention to this later.
2. In the review, the authors discussed the laser parameters' impact on the performance of the device, but the author did not address the effect of laser stability on device features. During the operation of a laser, output power and wavelength can fluctuate and deviate, and this may affect the performance of the fabricated device. My question is how to prevent such problems. These discussions are crucial for readers, especially for researchers who are about to engage in laser writing.
3. English writing skills should be improved, such as, in line 196, “a series of work” should be changed to “a series of works”.
English writing skills should be improved.
Author Response
I have revised my paper according to your suggestions, Thanks a lot for your reviewing
Author Response File: Author Response.pdf
Reviewer 3 Report
Please see following the detailed comments and suggestions for this manuscript before accepting.
1. The language should be proofread and modified to improve the flow of writing.
2. The detailed practical/potential application of corresponding method of manufactuirng should be detailed in the manuscript.
3. A couple of tables/figures should be added to summarise the parameters/materials/techniques/advantages used in the related references.
4. The references are relatively old, very limited number of references published in last two years were cited. Please update them and add more references published in last 2-3 years.
5. The outlook and future research highlights should be added in the conclusions.
6. The conclusion section is too long and the authors are suggested to use bullet points listing the key summaries/findings.
Moderate editing of English language are required.
Author Response
Thanks very much for your suggestions, I have modified my paper by your suggestions.
Author Response File: Author Response.pdf
