No I did not. And neither did bowtieguy. It seems if you post in someone else's thread your post does not show under "New posts" For that matter your reply did not show by the bell icon.You know I posted this the 2 days ago
HERE > https://laserpointerforums.com/threads/videos-from-youtube-you-wish-to-share.98227/post-1557234
That would be cool but it's not much of a " death ray " Now an active fiber laser a couple - few magnitudes stronger would be interesting.Steve, thanks for sharing Styro's video with us!
You can never have too many "Death Ray" lasers.
Actually that is my thread................. if you post in someone else's thread your post does not show under "New posts" .............
Yes I used to mix up NEAR IR with SHORT IR.....oh wait, they are both listed as 700nm - 2500nm ( 0.7um - 2.5um )all over the web, but images like this make the two terms appear to be different. Here Near IR looks like 700nm - 1000nm and Short wave IR looks like 1000nm - 2500nm then medium wave and long wave.Styro may have properly stated “shortwave IR” on this video, relative to longer WL IR, but it’s a bit misleading to call it that in a video meant to draw the attention of just anyone on the net, some might assume the wavelength is shorter than visible, he said that twice before I stopped watching.
Perhaps I’m just splitting hairs! But when he said that I assumed he misspoke for a bit, but he didn’t. Then realizing that, I had to go see how long is considered short:
Short-wave infrared (SWIR) light is typically defined as light in the 0.9 – 1.7μm wavelength range, but can also be classified from 0.7 – 2.5μm.
Yes CO2 is around 10400nm ( 10.4um ) but what I want is to know the real definition of the terminology so I can say it right, there is a lot of information online that's lacking, even Wikipedia and webesters just say 0.7-2.5um for either term, but I know I have heard people make a distinction, I just want to know the difference so I can get it right., I'm not being critical of anyone.I prefer to call it Near-IR, but whatever, far shorter than what a CO2 laser will produce.
Different definitions are used for distinguishing different infrared spectral regions:
The near-infrared spectral region (also called IR-A) ranges from ≈ 700 to 1400 nm. Lasers emitting in this wavelength region are particularly hazardous for the eye, as near-infrared light is transmitted and focused to the sensitive retina in the same way as visible light, while not triggering the protective blink reflex. Adequate eye protection is then very important.
- The short-wavelength infrared (SWIR, IR-B) extends from 1.4 to 3 μm. This region is relatively eye-safe, since such light is absorbed in the eye before it can reach the retina. Erbium-doped fiber amplifiers for optical fiber communications, for example, operate in that region.
- The mid-infrared (mid-wavelength infrared, MWIR, IR-C) ranges from 3 to 8 μm. The atmosphere exhibits strong absorption in parts of that region; there are many absorption lines e.g. of carbon dioxide (CO2) and water vapor (H2O). Many gases exhibit strong and characteristic mid-IR absorption lines, which makes this spectral region interesting for highly sensitive trace gas spectroscopy.
- The long-wavelength infrared (LWIR, IR-C) ranges from 8 to 15 μm, followed by the far infrared (FIR), which ranges to 1 mm and is sometimes understood to start at 8 μm already. This spectral region is used for thermal imaging.
Yes it can be done but not at particularly high powers in visible range yet.. Few watts max typically. Been waiting a long time for that to increase over time. All the high power stuff so far I've seen and worked with is fibre pumped bulk laser though.Speaking of active fiber I wonder if the inner core of an active fiber laser could be doped so as to directly lase in a visible wavelength rather than pumping a crystal to make a high quality visible beam as active fiber can produce a very high quality beam