Recent content by seoguy

For CD/DVD/Blue-Ray drives, the physical layout of the media (and particularly how tight the tracks can be packed together) is a function of the wavelength of the laser the media was designed for (shorter wavelength lasers allow you to pack the data more tightly, and thus store more data on the...

Thanks for the +rep, anselm! :) I took a look at that Google table - those fractional wavelength values have got to be driving you crazy! :banghead: On the photopic vs scotopic topic, you may find this graph - and the following post helpful -...

What, you mean my poor over-driven green LD may have a lifespan of LESS that 10,000 hours of continuous use before I see some efficiency degradation? :cryyy: I think that Nichia may be under-rating these diodes, due to the market these will initially be utilized for. You or I may not consider...

rhd, I heard that the company that was manufacturing the unique direct-doubled greenie used in the ShowWX was ceasing production, in part because the new green LD's were expected to cost less! So we might get lucky on the price of the new pico's! :) The usefulness of laser RGB will also mean a...

Great find, lazeerer! Looking at those prelim specs, I can't help but notice how incredibly conservative that 50mW rating is! - * Not much room for a big heat sink in a pico projector, so these have to operate with minimal heat sinking at rated power; * Life Expectancy is based not on...

Helios, 473nm is an exotic/finicky variety of DPSS design, whereas 510nm is just a simple LD-based design, no different from a basic red or Blu-Ray laser, other than it is using a new diode that outputs at 510nm rather than 670nm. ;) These are designed for mass-market applications, so I would...

An Arduino is one of the first things that came to mind when I read your thread. Heck, with one of those SD card + Ethernet shields, you could even implement a web server on the device itself if you wanted to! LOL (Not that I would recommend that over a regular web server, but it's nice to...

Glad you liked it! :) Heavens, NO! :eek: I did make fun of Wikipedia in that post (as well as crazy Google, which at that time was actually ranking wiki pages #1 above legit science sites for many searches:rolleyes:, a source of humor & frustration for ppl in my field). The actual reference...

They may have been referencing 660nm, as otherwise the math on that second quote doesn't seem to add-up? :confused: Not sure if the temp-induced shift on a 635 would be the same or not, but if it is, that would result in 617nm at -35C! Break-out some dry ice (-78.5C), and assuming the shift...

Yep, would be interested! Hmmm...TEC, perhaps? ;) Speaking of which, if these guys do 635nm @room temp, wonder what wavelength we might get with some serious cooling? :cool: icecruncher, just saw your comment after I posted mine. Not sure how high you are pushing your LOC's. But you need to...

Great idea! An easier way to automatically test LD's could allow us to do more detailed testing than would be practical otherwise. It could provide for easy, standardized testing for new LD's, range-testing over a # of devices, allow comparison testing of different manufacturer variants, even...

OK, I've got GOOD news, and BAD news...I'll give you the good news first... Have you seen this spiffy heat sink? By none other than Aixiz, to fit their own 12mm modules - OK, somebody needs to explain to them what a set screw looks like. :rolleyes: But other than that, these babies look...

Re: FS: Heatsinks $7 Did you ever find out if you had any of that bar left? :thinking:

Oh, OK! But I'm thinking a bluish emerald green beam would also look pretty sweet. :cool: Agreed. I think it would make the perfect star pointer! That's for sure! Thinking about that, it would also make green a lot more practical for use in hunting & camping - no need to worry about...

I actually came across that # quoted in numerous sources while researching this. But due to the complexities involved, the actual curve has been somewhat of a moving target over the years. In fact, the photopic curve even varies by the field of view! The very center of the fovea (0.35 degrees...