Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

GB: 1W 520nm diode information/giveaway

Jmillerdoc

Jmillerdoc

0
Joined
Oct 3, 2011
Messages
899
Points
0
bloompyle said:
I planned to use a couple large 400W (-60 to +180C). Though I've heard that these don't alter much once cooled.

So now the plan is to use a CPU LN2 system to cool an Al heatsink for a 638nm. They've hit 608nm at -191C.
Click to expand...

I second that, any other reading you can point us to about this magnitude of change in wavelength with cooling? I wonder what you could expect with a 638nm diode cooled to -80c? This is the temperature dry ice sublimates and should be attainable using a block of dry ice with a sink embedded partly into it. It would be pretty cool (no pun intended) to see what wavelength could be attained using simple dry ice to cool a diode.

Wouldn't be surprised at all if this has been tried before.
 





ARG

ARG

0
Joined
Feb 27, 2011
Messages
6,772
Points
113
Spectrometer interface software was giving me a hard time, but it's all set up now.

Time to collect data :D
 
bloompyle

bloompyle

2
Joined
Apr 26, 2010
Messages
4,175
Points
83
Planters from PL did this. From my phone, I can't get the video.

If you find his channel on PL, you'll also see a multiwatt 575nm dye, a cool DPSS, and some other neat work.

He's done there're cryo experiments. The only one worth a damn was using the P73 to get 608. The end of the video shows 2W of 608 going through a grating, hundreds of orange spot goodness.

It's like a half hour video, but worth watching. He documents the whole process from room temp, to -191C. Constant reading of wavelength, power, and input :)
 
Last edited:
Atomicrox

Atomicrox

0
Joined
Jun 22, 2011
Messages
2,431
Points
83
Not sure others would agree, but perhaps a long run (active cooled) at high current (2.6A maybe) to see if it can be pushed safely?

Not sure if you can take it outside easily but if you can I'd really like to know if the beam is visible on the daytime sky... I've asked this a couple times on different threads and no one that had the diode responded :p

BTW thanks for testing!
 
Last edited:
ARG

ARG

0
Joined
Feb 27, 2011
Messages
6,772
Points
113
Unfortunately I can't keep it actively cooled for that long, my cooling setup is inadequate for the 12W of heat it produces at that power.

I can test the diode in the daytime, but it's rainy and the cloud cover is making it dark, so I'll try again tomorrow :p
 
K

kaunak

0
Joined
Mar 29, 2008
Messages
212
Points
18
How does the beam/dot brightness compare to say, 3.5W of 445? How about 6W?(your old triple diode build)
 
ZRaffleticket

ZRaffleticket

0
Joined
Feb 4, 2010
Messages
3,280
Points
113
I guess I can say I'm interested in knowing how it compares to 3.5W 445. That way I know what I'm getting into when these things drop in price :p

Or when i win...
 
Last edited:
K

kaunak

0
Joined
Mar 29, 2008
Messages
212
Points
18
ZRaffleticket said:
I guess I can say I'm interested in knowing how it compares to 3.5W 445. That way I know what I'm getting into when these things drop in price :p

Or when i win...
Click to expand...

Same here. I believe DTR said it was much brighter than the brightest 445 he'd ever seen. I have a slightly difficult time believing that it's much brighter than 5W of 445, although Rick Trent would agree it's brighter
 
bdgreenb

bdgreenb

0
Joined
Jul 20, 2011
Messages
723
Points
28
1.5W of green goodness! The question I have to ask is... How many new 3.5W put together are as bright as this 520 beast?! I saw in an earlier thread it would be close to 38W of 445
 
Last edited:
Shakenawake

Shakenawake

0
Joined
Mar 11, 2013
Messages
1,541
Points
83
I do suspect the green is brighter. 5W @445nm should not even be twice as bright as 3.5W @445

I want the power though
 
bloompyle

bloompyle

2
Joined
Apr 26, 2010
Messages
4,175
Points
83
I've seen 1W of 532nm first hand. It is far brighter than the 2W 445 I had. The extra 1,5W of 445 will have little to no difference. I'd imagine the 1,5W 520 to be twice the brightness of the 6W 445.
 
K

kaunak

0
Joined
Mar 29, 2008
Messages
212
Points
18
bloompyle said:
I've seen 1W of 532nm first hand. It is far brighter than the 2W 445 I had. The extra 1,5W of 445 will have little to no difference. I'd imagine the 1,5W 520 to be twice the brightness of the 6W 445.
Click to expand...

Twice the brightness of 6w 445, that is, the same as 24W of 445? The beam must be visible from the f'in moon lol. Must be cool to see first hand
 
Last edited:
ARG

ARG

0
Joined
Feb 27, 2011
Messages
6,772
Points
113
kaunak said:
How does the beam/dot brightness compare to say, 3.5W of 445? How about 6W?(your old triple diode build)
Click to expand...

I don't have 3.5W of 445nm on hand, but 5W of 445nm is definitely brighter than 1.4W of 520nm.
 
You must log in or register to reply here.




Top