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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 25 Jun 2018
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      Replying to @ChrisDaviesw @bofh453

      This happens all the time, sadly. Meanwhile, that physician has no clue about laser safety. "Green-blue lasers are typically considered more dangerous than red-orange lasers because they emit a light [...] to which the human eye is most sensitive". That's totally backwards.

      1 reply 0 retweets 1 like
    2. Hector Martin‏ @marcan42 25 Jun 2018
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      Replying to @marcan42 @ChrisDaviesw @bofh453

      At visible wavelengths, the only thing that matters is power. Green lasers appear brighter at the same power. Therefore, at the same apparent brightness, a green laser is much safer than a red laser, since it will be much lower power.

      1 reply 0 retweets 3 likes
    3. Hector Martin‏ @marcan42 25 Jun 2018
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      Replying to @marcan42 @ChrisDaviesw @bofh453

      This isn't considering IR leakage from DPSS green lasers though, which is a totally different problem that has nothing to do with the sensitivity of the retina. That just depends on how crappy the laser pointer is.

      2 replies 0 retweets 1 like
    4. Chris Davies‏ @ChrisDaviesw 25 Jun 2018
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      Replying to @marcan42 @bofh453

      Agree with you up to a point, but don’t know whether makers ‘reduce power’ just because’ it’s a green laser. In passing, most reports I’ve seen of misuse in UK relate to lasers being pointed at aircraft.

      1 reply 0 retweets 0 likes
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    9. Hector Martin‏ @marcan42 25 Jun 2018
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      Replying to @bofh453 @ChrisDaviesw

      Was this just the KTP or the whole cavity? All the green cheapos I've seen recently have a monolithic block with the ND:YVO4 + KTP and cavity mirrors all in one piece. Older models had more discrete components.

      1 reply 0 retweets 0 likes
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      Hector Martin‏ @marcan42 26 Jun 2018
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      Replying to @bofh453 @ChrisDaviesw

      Interesting. I think all the modules I've seen in the past 8 years or so used the monolithic block, but I haven't torn down that many.

      1:42 AM - 26 Jun 2018
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