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    When & where did the term 'host' originate?

    I've often wondered about this, but I've never seen a satisfactory answer. I have a lot of technical hobbies (electronics, computers, RC etc) where you have to house your projects in an enclosure. This is invariably called a housing, case or enclosure. It is never called a 'host'. Hand held...
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    Green Laser shined in my eye

    A single layer tent will absorb a small percentage of the energy (how much depends on colour and thickness), and scatter the rest into a wider beam. I would not want to use tent fabric as laser goggles, even at 5mW.
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    Does this look safe to you?

    Thanks, that's the handle I needed :-)
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    Does this look safe to you?

    I don't know much about best practices for laser shows, but I am uncomfortable watching this: 1000mw LASER - YouTube I recognise that the exposure time is very short, but you're still repeatedly getting zapped with 1W of 532nm. Am I being over-cautious?
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    Running a 445nm diode at 30mW

    Thanks - good point about the battery voltage dropping.
  6. G

    Running a 445nm diode at 30mW

    Hi all, If I want to run a 445nm diode at a tiny 30mW, is there any need for a driver, or can I just use a current limiting resistor?
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    Ebay modules - are they ever worth it?

    Thank you, that's good to know. Sadly those guys only ship within the US (I'm in the UK).
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    Ebay modules - are they ever worth it?

    I can live with 150mW sold as 200mW. What I don't want is a 50mW sold as 200mW :yh:
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    Ebay modules - are they ever worth it?

    I know this has been discussed before, but I can't get a feel for the consensus. Are these 200mW modules on eBay ever anything like 200mW of green output? Has anyone tested them? These are the things I mean: 200mW 532nm Green Laser Diode Module 3.7V-4.2V on eBay (end time 30-Mar-11 01:31:40...
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    Re: O-like 400mw green - $214 (hitting 600mw) - Review I really do! :) Wohoo!
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    Re: O-like 400mw green - $214 (hitting 600mw) - Review O-like have now removed the 400mW from their site altogether. I'd really like a 400-500mW 532nm. Any recommendations? I don't mind paying a bit more, as long as the output is genuine.
  12. G

    Smallest diameter collimating lens?

    It does make sense, I'm sure you're right. I'll order a projector and see what the array looks like.
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    Smallest diameter collimating lens?

    Fiber would be nice! I did wonder about the projector arrays, I've never seen one, so don't know what they are like.
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    Smallest diameter collimating lens?

    Thanks very much. The reason I want a smaller diameter package is that I'd like to build a 20 diode 30W total output head. My plan is to machine the head from a lump of copper rod, press the diodes into the back, and screw the lenses into tapped holes at the front. I could use the AIXIZ glass...
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    Smallest diameter collimating lens?

    Hi all, Can anyone tell me what the smallest collimating lens in a threaded housing is? I need to make a 445nm 1W in a smaller package than the 12mm AIXIZ. I can machine the housing, but I need a lens to use in it. Thanks!
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    Discovering physics - Light on lasers

    You can trace my laser obsession to me watching that program aged 9.
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    List of 445nm diodes

    It was the batteries - obviously C cells have too high an internal resistance for this application. Using a single 18650 lithium gives me 1.45A. I also put a 1000uF capacitor in parallel with the flex drive. My thinking is that the fexdrive has very peaky current draw, which the battery may not...
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    List of 445nm diodes

    I thought it might be one of the resistors initially, but I have checked them and am sure they're all soldered up. I'm using 4x C cells in series, giving 6v with no load, dropping to around 5v under load. Have ordered so juicy lithiums to try, and will also order another Flex drive in case...
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    List of 445nm diodes

    No, I am measuring the diode current (between the Flex and the diode). I am not too concerned about the output, I'm just curious as to why I can't put more than 1.2A through the diode. I tried powering the Flex from my bench power supply, but that was not a happy experiment, I'm sticking to...
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    List of 445nm diodes

    Thanks very much for that, it's really useful. I've just put together my first 445nm, using the same setup you have (A140, G1 lens, Micro Flex Drive V5). I don't have a laser power meter that goes up high enough, so I'm just measuring the current. I'm powering the Flex from 4x Alkaline C cells...




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