3 ms·

(This is not to say that ultrafast optical switching isn't far more exciting than desktop EUV sources-- in fact, I personally applaud the pivot, if indeed there

(This is not to say that ultrafast optical switching isn't far more exciting than desktop EUV sources-- in fact, I personally applaud the pivot, if indeed there was one ) I believe I recently saw on goog schol other attempts at vuv lasing/light emission using very similar setup of laser pumping in si-gr (Can't remember the exact search terms I used at the time, or how unsuccessful they were) E: here's one (2019 dissertation; ndyag ns-pulsed laser probe) which openly states the underlying motivations. You can also check the phd thesis when it comes out, usually they won't hold back on their informal motivations at defence-time :) https://tesidottorato.depositolegale.it/bitstream/20.500.14242/109945/1/Malik_Nadeem_Ahmed_Thesis.pdf https://tesidottorato.depositolegale.it/bitstream/20.500.142... If I hadn't read your doubts about the stability above, which reminded me of the limited lifetime of sn vapor sources (there due to contamination of optics), I wouldn't have imputed those motivations to TFA E2: one from 2019 on VdW vuv detectors (ns response time) https://pubs.acs.org/doi/full/10.1021/acsphotonics.9b00729 https://pubs.acs.org/doi/full/10.1021/acsphotonics.9b00729 E3: I also thought that the mention of "ambient conditions" in the uni PR was slightly out of place outside the context of light sources.

kragen 1y ago
The laser they used seems to be entirely VNIR, stopping at 400nm. I don't think you can pump a VUV laser with longer wavelength light without something like a frequency doubling crystal, and I don't think anyone has done that. So I don't think they were trying to generate an EUV/VUV light source. The only thing about this setup that suggests EUV/VUV to me is their petahertz claim, which I think is an error stemming from getting overexcited about their measured fall time. But I'm not that familiar with the area, so I could be mistaken.
- deleted 1y ago
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- gsf_emergency 1y ago
  Graphene based frequency doubling has been a thing, though. (Terahertz). VUV 2HG ditto, but as you said nonlinear crystals, and the intensity is not as great as claimed? https://ieeexplore.ieee.org/document/6259401 https://ieeexplore.ieee.org/document/6259401 https://pubs.aip.org/aip/rsi/article-abstract/84/6/063104/355331/High-intensity-coherent-vacuum-ultraviolet-source?redirectedFrom=fulltext https://pubs.aip.org/aip/rsi/article-abstract/84/6/063104/35... Lots of intertwining uh avenues of research! (Without full fledged devices, it's easy to lapse into pareidolia on spectras & motivations :( )
  - kragen 1y ago
    Neat, thanks!

kragen 1y ago

The laser they used seems to be entirely VNIR, stopping at 400nm. I don't think you can pump a VUV laser with longer wavelength light without something like a frequency doubling crystal, and I don't think anyone has done that. So I don't think they were trying to generate an EUV/VUV light source. The only thing about this setup that suggests EUV/VUV to me is their petahertz claim, which I think is an error stemming from getting overexcited about their measured fall time. But I'm not that familiar with the area, so I could be mistaken.

deleted 1y ago
[deleted]
gsf_emergency 1y ago
Graphene based frequency doubling has been a thing, though. (Terahertz). VUV 2HG ditto, but as you said nonlinear crystals, and the intensity is not as great as claimed? https://ieeexplore.ieee.org/document/6259401 https://ieeexplore.ieee.org/document/6259401 https://pubs.aip.org/aip/rsi/article-abstract/84/6/063104/355331/High-intensity-coherent-vacuum-ultraviolet-source?redirectedFrom=fulltext https://pubs.aip.org/aip/rsi/article-abstract/84/6/063104/35... Lots of intertwining uh avenues of research! (Without full fledged devices, it's easy to lapse into pareidolia on spectras & motivations :( )
- kragen 1y ago
  Neat, thanks!