Direct Green Laser Diode Technology Progress

[ZRaffleticket]

I wouldnt expect it for a while, the announcements of these diodes have been around for 2 years I think and only 3 or 4 members have them

 

[Super Critical]

Posted Jun 21, 2012 - at CompoundSemiconductor.net
World`s first 520nm green semiconductor LD over 100mW

Sony wins, corprate bastards. They still gotta make them cheap efficient, consistent and reliable.

 

[tsteele93]

No word on divergence either. DPSS has a great dot!

 

[Super Critical]

Sounds like the Sony Sumitomo team has their act together.

 

[pullbangdead]

One alternative is growth on the nonpolar M planes orthogonal to the C plane, but diode fabrication has proven difficult. Sumitomo and other developers, including Corning (Corning, NY), Soraa (Freemont, CA), and the University of California at Santa Barbara, have taken a compromise approach. They grow diodes on semipolar planes at a 45° angle to both the C plane and the crystal axis, where growth is easier and efficiency is higher, although more indium is needed..

Close, but not quite. They can do better than that.

The idea of semipolar GaN is given pretty much correctly, but it's the details that sometimes matter most. They're growing on the 20-21 plane, which is not 45 degrees off of m-plane or c-plane. 20-21 is tilted 15 degrees off of m-plane, and is therefore 75 degrees off of c-plane.

And the growth isn't necessarily any easier, it's just different.

 

[bloompyle]

I was honestly hoping to see these more available when I got back, hopefully by the time I can solder, I can make my own 515 build. Although it's interesting to read the train of events that took place over the last 2 months.

 

[ZRaffleticket]

You missed a near-group buy, AnthoT might still be negotiating... or maybe he needs a reminder to harass whomever he contacted.

 

[tsteele93]

I was honestly hoping to see these more available when I got back, hopefully by the time I can solder, I can make my own 515 build. Although it's interesting to read the train of events that took place over the last 2 months.

Welcome back, you need to update your sig! Congrats, how are things going?

 

[aryntha]

I really wish this above news would mean that we might see yellow or orange diodes, but since there's no "commercial use" for those (I think) - i doubt we will...

 

[ZRaffleticket]

We may see yellow diodes. They'd be useful in making "natural" looking laser lighting rather than the ugly pale or bluish white it currently gives us.

 

[tsteele93]

I think this will be like blue, we will all be jonesing for them and all of a sudden we will find a projector with some kick-butt green diode in it and we will be making posts like, "Remember back when there weren't any green diodes?"

 

[webdev77]

I really wish this above news would mean that we might see yellow or orange diodes, but since there's no "commercial use" for those (I think) - i doubt we will...

What about the Sharp "quattron" TVs or whatever they are called? Those use rgb and yellow LEDs to produce more natural whites rather than a bluish white. I think there are some valid uses for yellow diodes as well as bright green. I'm thinking that even though 515-530nm is considered ideal, we might see some 555nm or 570nm to get the brighter whites.

 

[steve001]

I really wish this above news would mean that we might see yellow or orange diodes, but since there's no "commercial use" for those (I think) - i doubt we will...

There are currently uses for yellow and orange lasers.

 

[ZRaffleticket]

Well of course there are, they wouldn't exist outside of labs otherwise, but I think he wants to know what said uses were.
Anyway to add with yellow, I read somewhere a while ago that 589nm is trying to be achieved in simple frequency doubling in high powers to replace sodium vapor lasers.

 

[steve001]

Well of course there are, they wouldn't exist outside of labs otherwise, but I think he wants to know what said uses were.
Anyway to add with yellow, I read somewhere a while ago that 589nm is trying to be achieved in simple frequency doubling in high powers to replace sodium vapor lasers.

Well he wasn't sure.

Originally Posted by aryntha View Post
I really wish this above news would mean that we might see yellow or orange diodes, but since there's no "commercial use" for those (I think)

All aryntha need do is search the internet to know the particular uses for those wavelengths of light.

 

[ZRaffleticket]

But who likes to do their own research these days?