Old 03-08-2009, 12:38 AM #17
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Default Re: What's the mw of the IR pump laser in a 5mw gr

As alignment goes: There are quite a number of (chinese made, i suppose) green lasers on the market now that have the crystal set just mounted flush with the pump diode - no lens or other optics in between at all. These might be a lot easier to replace the pump on, since you only have to get its rotation right keeping the spacing between pump and crystal near zero.

Quote:
I have a CNI pen that averages 171mW that has a 500mW pump, and that isn't from IR.
Its possible, but probably rare to get such efficiency. Any green DPSS laser will lose 24% power going from 808 to 1064, that is an inevitable quantum loss.

If coupling is perfect, doubling would be almost 50% efficient in your unit - quite amazing, but not impossibe.


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Old 03-08-2009, 10:02 AM #18
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Default Re: What's the mw of the IR pump laser in a 5mw gr

I have an older Radio Shack 5mw green laser that I tried "pot modding" awhile ago. Had it going pretty bright for awhile, not high enough to burn, but still very bright. I used it for about a year that way and one day it stopped working altogether.

The boost driver board is still working, so I thought it would be worthwhile to just replace the burnt out didoe.

The diode had a threaded collar, that locked it into the rear of the brass laser housing, inside a form fitted cavity. It doesn't look like there's any room to adjust it's fit, other than stick it in the socket and screw tight the retaining collar.
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Old 03-08-2009, 05:08 PM #19
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Default Re: What's the mw of the IR pump laser in a 5mw gr

Quote:
Originally Posted by ElektroFreak
[quote author=styropyro link=1236394798/0#12 date=1236449931]
I have a CNI pen that averages 171mW that has a 500mW pump, and that isn't from IR. The power metering isn't off either, I got it from Pseudo and we all know his meter isn't crap. ;D
Without an IR filter, how can you be sure that you're measuring green only? Or does your pen have an IR filter?[/quote]
Sorry I worded that badly, this laser is IR filtered.
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Old 03-08-2009, 08:44 PM #20
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Default Re: What's the mw of the IR pump laser in a 5mw gr

ALL CNI pens come with IR filters.
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Old 03-08-2009, 10:19 PM #21
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Default Re: What's the mw of the IR pump laser in a 5mw gr

Quote:
Originally Posted by styropyro
[quote author=ElektroFreak link=1236394798/0#14 date=1236465059][quote author=styropyro link=1236394798/0#12 date=1236449931]
I have a CNI pen that averages 171mW that has a 500mW pump, and that isn't from IR. The power metering isn't off either, I got it from Pseudo and we all know his meter isn't crap. ;D
Without an IR filter, how can you be sure that you're measuring green only? Or does your pen have an IR filter?[/quote]
Sorry I worded that badly, this laser is IR filtered.[/quote]

Wow.. I'm pretty impressed by the efficiency, then. Especially from a pointer.. I have several CNI lab style systems and I love them, IMO they're the best to come out of China, so I guess it's no real surprise that they would boast high efficiency.
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Old 03-08-2009, 11:18 PM #22
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Default Re: What's the mw of the IR pump laser in a 5mw gr

I just wanted to chime in to say that the leadlight crystals are FAR better than the 'dx30' crystals. They are bigger and are meant to be hit with more power. They have less efficiency at low power because they are meant to be pumped harder.

It's like if you have a car that revvs to 5k RPM and another car that revvs to 12k RPM, the one that doesn't rev as high will be much more efficient at 2,000 RPM vs. the higher revving engine, because the higher revving engine needs to be spun faster to reach it's power band. It's the same with these crystals.

You can have a tiny DX crystal set and pump it with 100mW of 808 and you'll probably get some green, whereas you can have a huge million dollar crystal set and pump it with 100mW of 808 and you'll get absolutely nothing.
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Old 03-09-2009, 12:50 AM #23
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Default Re: What's the mw of the IR pump laser in a 5mw gr

Quote:
Originally Posted by GooeyGus
I just wanted to chime in to say that the leadlight crystals are FAR better than the 'dx30' crystals. They are bigger and are meant to be hit with more power. They have less efficiency at low power because they are meant to be pumped harder.

It's like if you have a car that revvs to 5k RPM and another car that revvs to 12k RPM, the one that doesn't rev as high will be much more efficient at 2,000 RPM vs. the higher revving engine, because the higher revving engine needs to be spun faster to reach it's power band. It's the same with these crystals.

You can have a tiny DX crystal set and pump it with 100mW of 808 and you'll probably get some green, whereas you can have a huge million dollar crystal set and pump it with 100mW of 808 and you'll get absolutely nothing.
I get what you're saying, but that begs the question: Why use those huge higher-quality crystals in a 5mW pointer when you could just use smaller, cheaper crystals and get better results? It seems both inefficient and overly costly.. I could see using the lack of efficiency at low powers to help make sure the laser isn't overpowered, but that could be more cheaply done simply by adding APC to the driver circuitry...
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