High Field Single- to Few-Cycle THz Generation with Lithium Niobate
Round 1
Reviewer 1 Report
The well-written work shows the most important stages of the evolution of high field single or few-cycle THz generation setups based on LN. The paper focuses basically on the tilted-pulse-front and Cherenkov-type methods. The goal of improving the THz energy/field is motivated by several applications mentioned in the introduction.
The work is a review-like paper that will be probably useful for scientists working in this field.
Some typographic errors:
Space is requiredin
page 2, line 62 (3THz)
page 7, line 291 (50mJ/cm2)
page 8, line 296 (1.4mJ)
page 8, line 338 (1kHz)
In Section 3 both groove spacing (d) and groove density (g) are used. It would be practical to decide between them.
Finally, some very new imaging-less solutions should be also mentioned:
Toth et. al, Optics Express Vol. 27, Issue 5, pp. 7762-7775 (2019)
Zhang et. al., Laser Photonics Rev., 15, 2000295 (2021)
Suizu et. al., Opt. Express 17, 6676 (2009)
Toth et. al., Optics Express Vol. 27, Issue 21, pp. 30681-30691 (2019)
Krizsan et. al., Optics Express Vol. 28, Issue 23, pp. 34320-34327 (2020)
My overall impression is very positive on this paper.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Dear Authors,
In my opinion the manuscript present a very attractive overview of the THz pulse generation methods and will be interesting for the readers of Photonics. My recommendation is “Accept after minor revision” due to low quality of the figures. They suffered from low resolution. Some letters are small and blurred and are hard to read. It is highly recommended to provide figures with better quality.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 3 Report
This is a review paper about THz generation using LN. The authors summarized different technologies. There are some problems.
- Most of the references are published before 2019, except [16][21][50]. The authors should do some research about the latest development.
- The figures are all blurry with low resolutions, and some figures did not obtain reprint permissions
- The authors may list a table to summarize all the technologies with their advantages and disadvantages.
- The meaning of "single- to few- cycle" should be explained in the introduction part.
- Whether the author’s research group has made innovative breakthroughs in this research field, and can the authors add some content about this?
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 3 Report
The authors have answered all the questions and improved this paper accordingly.
