 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Natural Science Forum / Physics / Optics / July 2008405nm lasers and blu-ray laser modules
here is the motherload http://shop.ebay.co.uk/merchant/405nm laser light the sky at night 404nm On Jul 25, 8:10 pm, "405nm....@googlemail.com" <markyor...@googlemail.com> wrote: > here is the motherloadhttp://shop.ebay.co.uk/merchant/405nm There are less expensive alternatives if you can operate a soldering iron. Peace, dave > here is the motherload > http://shop.ebay.co.uk/merchant/405nm > > laser light the sky at night > > 404nm "I'ts hard to decide, is it a purple laser, a blue laser or a bright yellow laser!!!" It is VERY easy to decide. It is *NOT* blue! Blue is 473nm. > 405nm....@googlemail.com wrote: > > here is the motherload [quoted text clipped - 8 lines] > > It is VERY easy to decide. It is *NOT* blue! Blue is 473nm. AMEN! There's no doubt that the beam from my 405nm lasers is violet. It is unfortunate that the marketing departments decided to call these "blu-ray." I guess that "Near-Ultra-Violet-Ray" just didn't roll off of the tongue easily ;) "nuv-ray" ? Peace, dave > > 405nm....@googlemail.com wrote: > > > here is the motherload [quoted text clipped - 23 lines] > Peace, > dave Not only is it violet, it is so close to UV that it's almost invisible unless it strikes a surface that fluoresces. Truly lousy for laser pointer without a cooperating screen! :) --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. sam@repairfaq.org schrieb: >> > It is VERY easy to decide. It is *NOT* blue! Blue is 473nm. >> >> AMEN! >> >> There's no doubt that the beam from my 405nm lasers is violet. Maybe it's individual? All I can tell you is that the 397 nm beam from my last experiment appeared blue and not violet... > Not only is it violet, it is so close to UV that it's almost invisible > unless it strikes a surface that fluoresces. ... and that this light was much better visible than a beam of the same intensity of the fundamenal 795 nm light from which it was generated. > Truly lousy for laser pointer without a cooperating screen! :) That is true of course. Even though a few µW of 395 nm appeared clearly visible in a dark room, in contrast to even a green LED it was rather dim. Cheers, Jürgen  SignatureGPG key: http://pgp.mit.edu:11371/pks/lookup?search=J%FCrgen+Appel&op=get On Jul 27, 6:25 am, s...@repairfaq.org wrote: > Not only is it violet, it is so close to UV that it's almost invisible > unless it strikes a surface that fluoresces. [quoted text clipped - 5 lines] > +Lasers | Sam's Laser FAQ:http://www.repairfaq.org/sam/lasersam.htm > | Mirror Sites:http://www.repairfaq.org/REPAIR/F_mirror.html Actually, mine is quite lovely. It is true that this is so close to the edge of our eye's ability to see that different people perceive it differently, However, in powers above 100mW, it is visible. It has been my experience that older people (like myself) and people with glasses have more problem seeing it, but most can see it. The beam must be greater than 150mW for me to see it. Also, the "dot" is amazing as it seems to change color depending on what surface is being lit. I use a 10mW unit in lecture. If the laser hits the wall, it is very dim. When the laser hits the screen, it's perceived brightness increases dramatically. It is a great attention getter. Peace, dave "daguin" <dguin@verizon.net> wrote > Actually, mine is quite lovely. It is true that this is so close to > the edge of our eye's ability to see that different people perceive it > differently, However, in powers above 100mW, it is visible. It has > been my experience that older people (like myself) and people with > glasses have more problem seeing it, but most can see it. Corneal yellowing. As we age, our corneas grow yellow, which greatly attenuates far blue light. I have a valve (tube) phono preamp for my turntable, and the power LED is very bright, and deep blue. In a darkened room, its light diffusely reflects from various things on a table between the LED and the listening position. Out of the corner of my eye, I can clearly see some of the dimmer reflections, yet looking directly at them, in some cases I don't see the blue at all, and in other cases, they look much dimmer. I'm 36. Alarming! I'm not sure whether the yellowing process is solely caused by ageing effects, or whether by exposure to UV and far blue light. As for whether far blue is perceived as blue or violet, it will depend largely on the response of the individual's red receptors at the wavelength in question. If they still respond significantly, the light will look violet, else just blue. Martin SignatureM.A.Poyser Manchester, U.K. |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.