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Old 05-08-2010, 08:17 PM #33
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Default Re: 500mw 445nm True Blue Diode $470 =)

I'm with the MarioMaster..

I also want to thank you PBD. That's great info!


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Old 05-08-2010, 08:24 PM #34
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Default Re: 500mw 445nm True Blue Diode $470 =)

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Originally Posted by pullbangdead View Post
I think the detail missing is that "multimode" is a completely relative term. If it's not one, it's multi, and therein lies the possible confusion. It could be gain-guided with some massive width, or it would be what that one guy said on PL and be index-guided and only 7um wide. A 7um ridge laser would likely be multimode, but not nearly as bad as wider ridges, and not nearly as bad as a gain-guided diode.

Then, even beyond the diode, you get into "multimode" bars which are actually multiple emitters, which makes it even worse.

But just someone saying "multimode" could mean any of these things, especially if you get people who just hear "multimode" and really don't know the difference. It's a phrase that gets repeated a lot with relative certainty, even though it is a completely relative term.

If the guy on PL is right and it's an index-guided 7um wide laser, then it's likely not going to be too bad. A single mode laser may be 2 or 3 um wide, just for reference, so 7um isn't that much wider, relatively speaking. ETA: Also for reference, a PHR has a ~1.5um ridge width.
Here's what drlave said about it in another thread:

Quote:
Originally Posted by drlava View Post
the beam, as it comes out of a basic aspheric collimator, is about 4.5mm tall and 0.2mm wide. over a distance it turns square, then rectangular reminiscent of a c-mount 808 collimated with the same method. I do know of a few ways to collimate the beam into an even 'dot' namely using cylindrical lenses but have not acquired the proper lenses yet. If I do, there may be a group buy or something so if you buy one of these diodes keep in touch.
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Old 05-09-2010, 01:44 AM #35
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Default Re: 500mw 445nm True Blue Diode $470 =)

^After a lens that's already in the far-field, I'm not sure how that translates to diodes size and whatnot. I was just throwing a guess/possible explanation out there based on what one guy said on PL (that it has a 7um width), I have no idea if he's right or not. Just that if he is right, then it likely is somewhat multimode, but certainly nowhere near as bad as many multimode (or even multi-emitter) diodes you've seen in the past.


Even with the PHR and how well known it is, it took a bit of extra work to be able to tell you that it has a 1.5um ridge width and a cavity length of 400um, and not much else. Maybe in a few months I might have some more info to share on it, but not a lot.
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Old 05-09-2010, 04:51 AM #36
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Default Re: 500mw 445nm True Blue Diode $470 =)

So would a 7um index-guided 444nm diode be likely to have good enough characteristics that FAC is unnecessary? If so, and these diodes are of that type, that's very good news..
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Old 05-09-2010, 05:24 AM #37
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Default Re: 500mw 445nm True Blue Diode $470 =)

I'm already working on a way that will allow multimode diodes to be used in regular hosts like jayrobs.
Need to save up for the parts though. Jayrob I will be contacting you soon about something I need.

EDIT: Don't really care anymore

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Old 05-11-2010, 06:09 AM #38
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Default Re: 500mw 445nm True Blue Diode $470 =)

Well if the lens is asymmetric than the typical screw in method wont work will it? The lens or lenses will have to be aligned with the asymmetrical output of the diode.

IMO, even if the diode can output 150mW it'll be a good buy. That is a very rare and exotic wavelength. Even more rare than yellow pointers.

Personally I care more about the wavelength than power output. Burn stuff with 405nm, and set this diode at a VERY conservative power level.

I really hope that blue diodes are manufactured more frequently. TVs are soon going to ditch LED technology and adopt laser technology. Since diodes are more stable, smaller, and more efficent, I think laser TVs will favor diodes over DPSS. Eventually I'd bet DVD burners aren't going to be the only thing we're gutting to make lasers.

-Tony
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Old 05-11-2010, 11:56 AM #39
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Default Re: 500mw 445nm True Blue Diode $470 =)

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TVs are soon going to ditch LED technology and adopt laser technology.
Why do you think this? Laser TV's already exists, but it seems that manufacturers largely goes for OLED's instead.
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Old 05-11-2010, 02:05 PM #40
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Default Re: 500mw 445nm True Blue Diode $470 =)

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Originally Posted by Grix View Post
Why do you think this? Laser TV's already exists, but it seems that manufacturers largely goes for OLED's instead.
Laser technology is more expensive; hopefully they'll move from OLED to laser once it is not cost prohibitive.

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Old 05-11-2010, 04:22 PM #41
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Default Re: 500mw 445nm True Blue Diode $470 =)

Quote:
Originally Posted by Xplorer877 View Post
Well if the lens is asymmetric than the typical screw in method wont work will it? The lens or lenses will have to be aligned with the asymmetrical output of the diode.

-Tony
The lenses being used and discussed are aspheric, not "asymmetric". Asphereic lenses are what we are mostly already using.

Peace,
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Old 05-11-2010, 05:28 PM #42
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Default Re: 500mw 445nm True Blue Diode $470 =)

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Originally Posted by twhite828 View Post
Laser technology is more expensive; hopefully they'll move from OLED to laser once it is not cost prohibitive.

-Trevor
I don't think one will repalce the other, I bet there will be a ton of uses for OLED aswell for laser TVs.
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Old 05-11-2010, 07:49 PM #43
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Default Re: 500mw 445nm True Blue Diode $470 =)

These are pretty exciting diodes. Typically they would cost thousands in low quantities like this. For pointer purposes, they aren't that bad, and will amaze you with how powerful this blue wavelength appears compared to 405nm. I have looked into some FAC solutions, some costing as much as $250. This lens probably won't be worth it for a pointer, but will for a projector. As youall get them, I look forward to hearing your experiences

Also, I think they are probably gain guided, not index guided.

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Old 05-11-2010, 07:52 PM #44
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Default Re: 500mw 445nm True Blue Diode $470 =)

I NEED more than 24 hours in a day. Can anyone help?

Peace,
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Old 05-11-2010, 08:05 PM #45
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Default Re: 500mw 445nm True Blue Diode $470 =)

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I NEED more than 24 hours in a day. Can anyone help?

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Sure Dave, just send me the diode and I'll test it out for you.
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Old 05-11-2010, 08:28 PM #46
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Default Re: 500mw 445nm True Blue Diode $470 =)

Nah, who am I kidding, I don't have enough time in the day either.
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Old 05-11-2010, 11:43 PM #47
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Exclamation Re: 500mw 445nm True Blue Diode $470 =)

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Why do you think this? Laser TV's already exists, but it seems that manufacturers largely goes for OLED's instead.
Not in TVs, but in micro-projectors. SAMSUNG has a prototype that I saw at COEX technology show last year. It uses 1 red, 1green DPSS? Not sure.... and a true blue diode. The total size is a little larger than a deck of cards.
Resolution is still only 800x600.


They are working on 720p and 1080p versions. ---

BTW, I have a micro projector for sale if anyone is interested in it.
It's called a BIT projector. Res is 800x600 in VGA and RGB/XVGA powered by a 5W LED.
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Old 05-12-2010, 01:20 AM #48
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Default Re: 500mw 445nm True Blue Diode $470 =)

Quote:
Originally Posted by daguin View Post
The lenses being used and discussed are aspheric, not "asymmetric". Asphereic lenses are what we are mostly already using.

Peace,
dave
Mmmkay, gotcha.

-Tony
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