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Old 05-03-2017, 12:53 AM #1
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Default I got my first Green Laser 532nm today !

So far it's just a green dot on the wall but it should be pretty cool at night !

I have just a few thoughts, During my searching and reading up on lasers I have read many time about how some lasers use crystals to achieve their color, And sometimes a dif type of crystal for a dif color.

Now having read that it should have came as no surprise that when I dug into it to straighten out the beam a bit and at the same time see what make it tick I realized that the beam has to go through the crystal it's self......

The crystal is down underneath the part holding the lens and must be align just right for the beam to turn green.....



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Old 05-03-2017, 01:09 AM #2
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Default Re: I got my first Green Laser 532nm today !





The driver powers an 808nm pump diode that can have it's own lens or not, but it pumps a 2 part krystal that's bonded of neodymium doped YV04 and KTP to convert 808 to 1064 then double the frequency to 532nm, there is a mirror coating that passes best 1 way at the input and the output has the OC or output coupler which is a mirrored coating with a tiny hole in the center, these mirrors are typically coated onto the crystal pair in this case, understand that if you pop off that brass ring that has the crystal glued in you will be looking into invisible 808 that's typically 5X the power of the laser, so don't look into it.

Interesting thing you have no doubt seen is the BE built into the output end, it has a double concave sometimes refered to as a gradient index lens and a final focus lens because the output from the crystal is needle thin but it diverges faster, so they use a BE.

The older ones were set up for a nice infinity beam, the newer ones to burn a dam match so I replace a lot of my final focus lenses, sometimes with a bigger lens at a longer FL in a sliding cardstock tube.

You can take the crystal off and refocus the lens to project 808 onto your wall that you can see with CCD cameras such as security or old cell phones, many new cameras and cell cams have an IR blocking filter.

Here's a couple pics so you don't have to pop yours off to see, I have a bunch of crystals somewhere, they are tiny and bonded from the 2 parts with mirrored coatings on the ends.

You can see how cheaply made these are, overheating the glue or shock can throw them out of alignment.

I have some that have a separate crystal setup and some that use a C-mount diode in the back, those are rare.





This one has a lens for the 808







I know this stuff has been posted before and we are kinda wasting bandwidth, but it's cool to see the work that goes into these and the evolution of designs.
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I got  my first Green Laser 532nm today !-sany0686.jpg   I got  my first Green Laser 532nm today !-sany0687.jpg   I got  my first Green Laser 532nm today !-sany0695.jpg   I got  my first Green Laser 532nm today !-sany0696.jpg   I got  my first Green Laser 532nm today !-sany0697.jpg  

I got  my first Green Laser 532nm today !-sany0707.jpg  
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Old 05-03-2017, 03:48 AM #3
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Default Re: I got my first Green Laser 532nm today !

Damn, those crystals are all yours RCB? You've got quite the collection!

Think you covered the basics of how these work pretty well!
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Old 05-03-2017, 04:23 AM #4
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Default Re: I got my first Green Laser 532nm today !

I have a lot more, but they used to fail a lot more easily.

What I really want are some 1/2 watt to 1 watt 532 modules, and a 10 watt lab would be cool, I have some of the medium housings that put out 30-40mw, but what am I going to do with them now, I don't think I could just put in a bigger C-mount pump, it would burn the crystal.

5W C-mounts are getting cheap, I could get some new lenses and make IR units.

This should fit it but I wonder how good the beam quality would be, it has a micro lens no doubt for axis correction. It says 8/1.5
http://www.ebay.com/itm/808nm-10W-C-...gHQbdrQQV-3xBA



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Old 05-03-2017, 04:59 AM #5
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Default Re: I got my first Green Laser 532nm today !

Quote:
Originally Posted by RedCowboy View Post
I have a lot more, but they used to fail a lot more easily.

What I really want are some 1/2 watt to 1 watt 532 modules, and a 10 watt lab would be cool, I have some of the medium housings that put out 30-40mw, but what am I going to do with them now, I don't think I could just put in a bigger C-mount pump, it would burn the crystal.

5W C-mounts are getting cheap, I could get some new lenses and make IR units.

This should fit it but I wonder how good the beam quality would be, it has a micro lens no doubt for axis correction. It says 8/1.5
808nm 10W C-Mount Laser Diode with Micro-lens | eBay



That's true, even the cheap ones tend to last a while now.

Up at those powers design gets more complicated, definitely need bigger crystals to start off!

Yep, that's a FAC lens on there, should improve the output beam a good chunk! Still going to be nasty, but better than just raw.
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Old 05-03-2017, 09:48 PM #6
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Default Re: I got my first Green Laser 532nm today !

Quote:
Originally Posted by RedCowboy View Post
[IMG]
I know this stuff has been posted before and we are kinda wasting bandwidth, but it's cool to see the work that goes into these and the evolution of designs.
If you had never reposted this I would more than likely have never seen this SO I thank you !
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Old 05-04-2017, 12:27 AM #7
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Default Re: I got my first Green Laser 532nm today !

I was surprised to see they want $10.00 shipping from NJ.
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Old 05-04-2017, 05:20 PM #8
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Default Re: I got my first Green Laser 532nm today !

Congrats, I remember my first 532nm green pointer, it was back in 2003 and it was a custom build, 50 mW of power and cost $550. How far we have come. I was mesmerized by the lime green beam. I also had a cryonics 75mw cylindrical multi-line, I was in love��. The 515nm line captured me. I currently have a eghemus 515nm custom built and am quite happy with it. It looks like a weathered lightsaber. Again, having a new laser is an amazing feeling, may it serve you for many years!!!!
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Old 05-18-2017, 04:37 AM #9
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Default Re: I got my first Green Laser 532nm today !

This laser seems to have very, very, low divergence ?

I shot it across the lake (aprox 800m) last night and the dot was very small, Smaller than I thought it would be ?
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Old 05-18-2017, 12:56 PM #10
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Default Re: I got my first Green Laser 532nm today !

Measure the dot size at 1 foot and at 25 feet and let's calculate the divergence. You can measure it at any distance, not just 25 feet, but the further the more accurate.
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Old 05-18-2017, 04:23 PM #11
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Default Re: I got my first Green Laser 532nm today !

Yes what Alaskan said.

With green DPSS's you could be seeing anything from 0.8-1.2mRad. They usually have very good divergence.
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If you are after an RGB module, you can't go wrong with Optlasers. Their 400mW model is very high quality.
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Optotronics offers some of the highest output DPSS Portable Greens on the market. Their 1.4W RPL-II is by far their most amazing product and is known to be overspec.
Optotronics RPL 532nm DPSS Portables

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
Dragon Lasers Yellow Laser Pointers

Sanwu are known to be very high quality and every newcomer should check them out.
Sanwu Home

Bang good is a good source for many electrical items and are often cheap and reliable.
Bang Good Home

For reliable safety goggles visit Survival Laser. Use LPF445 for a 10% member discount.
Eagle Pair Safety Goggles

For more sites and information please check out this thread.
Which company should I buy from? By Sta




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Old 05-18-2017, 07:16 PM #12
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Default Re: I got my first Green Laser 532nm today !

Quote:
Originally Posted by Accutronitis View Post
This laser seems to have very, very, low divergence ?

I shot it across the lake (aprox 800m) last night and the dot was very small, Smaller than I thought it would be ?
If you are just looking at the dot from where you are shooting the beam from, the dot will always look the same size as it is farther away and the distance makes it look smaller than it actually is. Look at a paper plate at 800 meters and see how small it looks. You need someone else to be at the spot to measure the diameter. Then you will know exactly how good the divergence is.
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Old 05-18-2017, 07:24 PM #13
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Default Re: I got my first Green Laser 532nm today !

Quote:
Originally Posted by paul1598419 View Post
If you are just looking at the dot from where you are shooting the beam from, the dot will always look the same size as it is farther away and the distance makes it look smaller than it actually is. Look at a paper plate at 800 meters and see how small it looks. You need someone else to be at the spot to measure the diameter. Then you will know exactly how good the divergence is.

Yep, unless you've got a target with a meter stick or something on it and a pair of binoculars to look at the dot at said target.

It's difficult to judge divergence with any accuracy just by looking at the dot from a distance, at least with lower divergence lasers. You can compare lasers, you can see that some are objectively terrible, but extracting any sort of numerical value out of that requires actual measurements.
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Old 05-18-2017, 08:47 PM #14
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Default Re: I got my first Green Laser 532nm today !

I'm sure you are both right, I need to do some tests with my buddy "PJ", I guess I'm use to the divergence monster the 44 so it seem really small but there is only one way to know for sure.......
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